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Part 4, up to fault code 65535
Part 4, up to fault code 65535
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18179 P1771 1)
Load signal from engine CU
Open circuit/short to positive
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Fault in wiring between engine and gearbox control units or other components also receiving this signal (e.g. on-board computer)
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- Use current flow diagram to check wiring and connectors
Read measured value block , Display Group Number 009 2)
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18180 P1772 1)
Load signal from engine CU
Short to earth
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Short circuit in components also receiving this signal (e.g. on-board computer)
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- Perform Electrical Check
Check corresponding components (refer to current flow diagram)
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No/incorrect signal being output by engine control unit
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- Read out engine control unit fault memory and eliminate faults
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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1) One of the two fault codes will be stored depending on fault situation.
2) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault codes 18180 / P1772 and 18179 / P1771:
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◆ Fault detection condition: No problem detected with engine-speed and throttle-valve signals and no load signal detected for 245 ms.
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◆ If load signal fault is detected by the engine control unit, this fault is transmitted to the gearbox control unit.
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18192 P1784
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- Use current flow diagram to check wiring and connectors
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Up/down switch circuit
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Open circuit in wiring or short to earth in connection between engine and gearbox control units (pin 51)
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- Read measured value block
Check and, if necessary, replace engine control unit
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Open circuit/short to earth
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- Read out engine control unit fault memory and eliminate faults
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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1) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18192 / P1784:
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◆ This fault can only occur on vehicle models with no CAN bus A)
A) A distinction is made between vehicle models with and without CAN bus. For a precise definition of which vehicles are fitted with CAN bus, refer to
=> Automatic Gearbox 01V Front and Four-Wheel Drive; Repair Group 00; Code letters, assignment of mechanical units, transmission ratios, features
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18193 P1785
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- Use current flow diagram to check wiring and connectors
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Up/down switch circuit
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Short to positive in connection between engine and gearbox control units (pin 51)
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- Read measured value block
Check and, if necessary, replace engine control unit
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Short to positive
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- Read out engine control unit fault memory and eliminate faults
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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1) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18193 / P1785:
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◆ This fault can only occur on vehicle models with no CAN bus A)
A) A distinction is made between vehicle models with and without CAN bus. For a precise definition of which vehicles are fitted with CAN bus, refer to
=> Automatic Gearbox 01V Front and Four-Wheel Drive; Repair Group 00; Code letters, assignment of mechanical units, transmission ratios, features
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18222 P1814
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Open circuit in wiring or short to earth
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 1 -N215
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Pressure control valve 1 -N215 2) defective
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- Read measured value block ; Display Group Number 006 3)
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Open circuit/short to earth
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- Perform Electrical Check
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 1 -N215 is also referred to as solenoid valve 4 -N91.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18223 P1815
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Short to positive
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 1 -N215
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Pressure control valve 1 -N215 2) defective
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- Read measured value block ; Display Group Number 006 3)
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Short to positive
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- Perform Electrical Check
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 1 -N215 is also referred to as solenoid valve 4 -N91.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18227 P1819
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Open circuit in wiring or short to earth
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 2 -N216
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Pressure control valve 2 -N216 2) defective
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- Read measured value block , Display Group Number 006 3)
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Open circuit/short to earth
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- Perform Electrical Check
=> Page 01-281
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 2 -N216 is also referred to as solenoid valve 5 -N92.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18228 P1820
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Short to positive
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 2 -N216
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Pressure control valve 2 -N216 2) defective
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- Read measured value block , Display Group Number 006 3)
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Short to positive
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- Perform Electrical Check
=> Page 01-281
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 2 -N216 is also referred to as solenoid valve 5 -N92.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18232 P1824
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Open circuit in wiring or short to earth
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 3 -N217
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Pressure control valve 3 -N217 2) defective
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- Read measured value block , Display Group Number 006 3)
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Open circuit/short to earth
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- Perform Electrical Check
=> Page 01-281
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 3 -N217 is also referred to as solenoid valve 6 -N93.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18233 P1825
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Short to positive
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 3 -N217
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Pressure control valve 3 -N217 2) defective
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- Read measured value block , Display Group Number 006 3)
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Short to positive
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- Perform Electrical Check
=> Page 01-281
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 3 -N217 is also referred to as solenoid valve 6 -N93.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18237 P1829
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Open circuit in wiring or short to earth
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 4 -N218
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Pressure control valve 4 -N218 2) defective
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- Read measured value block , Display Group Number 007 3)
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Open circuit/short to earth
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- Perform Electrical Check
=> Page 01-281
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 4 -N218 is also referred to as solenoid valve 7 -N94.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18238 P1830
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Short to positive
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- Use current flow diagram to check wiring and connectors 1)
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Pressure control valve 4 -N218
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Pressure control valve 4 -N218 2) defective
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- Read measured value block , Display Group Number 007 3)
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Short to positive
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- Perform Electrical Check
=> Page 01-281
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1) Start by checking connectors for contact corrosion or ingress of water and replace if necessary. Particular attention is to be paid to 16-pin connector at gearbox between valve body and wiring harness if faults affecting solenoid or pressure control valves are displayed.
2) Pressure control valve 4 -N218 is also referred to as solenoid valve 7 -N94.
3) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18249 P1841
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Incorrect or defective gearbox control unit
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- Check identification of gearbox control unit and replace if necessary
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Engine/gearbox control unit
Non-matching versions
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Incorrect or defective engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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- Read out engine control unit fault memory and eliminate faults
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
Replace engine control unit if necessary
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18258 P1850
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Ignition switched on with connector of automatic gearbox control unit -J217 unplugged
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- Check connector of wire between engine and gearbox control units
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Data bus drive 1)
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Open circuit in wiring or short circuit between engine and gearbox control units
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- Perform Electrical Check
=> Page 01-194; Display Group Numbers 0082)and 0092)
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Info missing from engine CU
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Incorrect or defective engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
Replace engine control unit if necessary
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1) Drive data bus is also referred to as CAN bus.
2) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18258 / P1850:
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◆ Exchange of data and information between gearbox control unit and control units communicating with gearbox control unit takes place by way of a so-called CAN bus. All information signals are transmitted by 2 wires.
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◆ Function of CAN bus => Page 01-271
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18259 P1851
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Ignition switched on with connector of automatic gearbox control unit -J217 unplugged
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- Check connector of wire between engine and gearbox control units
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Data bus drive 1)
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Open circuit in wiring or short circuit between engine and gearbox control units/between ABS and engine control units
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- Perform Electrical Check
=> Page 01-194; Display Group Numbers 0082)and 0092)
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Incorrect or defective ABS control unit
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- Check identification of ABS control unit
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Incorrect or defective engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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Info missing from
ABS CU
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Incorrect or defective gearbox control unit
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- Check identification of gearbox control unit
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Refer to next page for notes and footnotes on fault code 18259 / P1851.
1) Drive data bus is also referred to as CAN bus.
2) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18259 / P1851 (CAN bus):
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◆ Exchange of data and information between gearbox control unit and control units communicating with gearbox control unit takes place by way of a so-called CAN bus. All information signals are transmitted by 2 wires.
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◆ Function of CAN bus => Page 01-271
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18262 P1854
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Open circuit in wiring or short circuit between engine and gearbox control units
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- Check connector of wire between engine and gearbox control units
Perform Electrical Check
=> Page 01-281
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Data bus drive 1)
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Short circuit between CAN wires
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- Read measured value block; Display Group Numbers 0082)and 0092)
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Defective engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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Defective hardware
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Defective gearbox control unit
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- Check identification of gearbox control unit
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Refer to next page for notes and footnotes on fault code 18262 / P1854.
1) Drive data bus is also referred to as CAN bus.
2) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18262 / P1854:
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◆ Exchange of data and information between gearbox control unit and control units communicating with gearbox control unit takes place by way of a so-called CAN bus. All information signals are transmitted by 2 wires.
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◆ Function of CAN bus => Page 01-271
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18263 P1855
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Ignition switched on with connector of automatic gearbox control unit -J217 unplugged
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- Check connector of wire between engine and gearbox control units
Perform Electrical Check
=> Page 01-281
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Data bus drive 1)
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- Read measured value block; Display Group Numbers 0082)and 0092)
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Incorrect engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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Software monitoring
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Incorrect gearbox control unit
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- Check identification of gearbox control unit
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Refer to next page for notes and footnotes on fault code 18263 / P1855.
1) Drive data bus is also referred to as CAN bus.
2) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18263 / P1855 (CAN bus):
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◆ Exchange of data and information between gearbox control unit and control units communicating with gearbox control unit takes place by way of a so-called CAN bus. All information signals are transmitted by 2 wires.
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◆ Function of CAN bus => Page 01-271
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18264 P1856
Throttle valve potentiometer -G69
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Fault in throttle valve potentiometer -G69 diagnosed by engine control unit
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- Read measured value block ; Display Group Numbers 008 1) and 009 1)
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Fault message from engine CU
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Fault in wiring between throttle valve potentiometer and engine control unit
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- Read out stored engine control unit fault codes and eliminate faults
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Incorrect or defective engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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Incorrect or defective gearbox control unit
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- Check identification of gearbox control unit
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1) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18264 / P1856:
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◆ Signal from throttle valve potentiometer -G69 is transmitted from engine control unit via CAN bus wire to gearbox control unit.
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◆ Fault detection conditions: Fault in component concerned is diagnosed by engine control unit. This fault diagnosis is transmitted via CAN bus wire to gearbox control unit.
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18265 P1857
Load signal
Fault message from engine CU
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No/incorrect signal being output by engine control unit
Fault in "Engine actual torque signal" diagnosed by engine control unit
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- Read measured value block; Display Group Numbers 0081)and 0091)
Read out stored engine control unit fault code and eliminate fault
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
Use current flow diagram to check wiring and connectors
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Incorrect or defective engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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Incorrect or defective gearbox control unit
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- Check identification of gearbox control unit
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Refer to next page for notes and footnotes on fault code 18265 / P1857.
1) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18265 / P1857:
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◆ Fault detection conditions: Fault in component concerned is diagnosed by engine control unit. This fault diagnosis is transmitted via CAN bus wire to gearbox control unit.
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◆ Fault detection condition: No problem detected with engine-speed and throttle-valve signals and no load signal detected for 245 ms.
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◆ If load signal fault is detected by the engine control unit, this fault is transmitted to the gearbox control unit in the form of a duty cycle fault.
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18266 P1858
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Fault in engine speed sender -G28 diagnosed by engine control unit
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- Read measured value block , Display Group Number 001 1)
Read out stored engine control unit fault codes and eliminate faults
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Rev signal from engine CU
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Incorrect or defective engine control unit
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- Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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Fault message from engine CU
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Incorrect or defective gearbox control unit
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- Check identification of gearbox control unit
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1) When selecting measured value block, note type of gearbox hydraulic control system. For a more detailed description, refer to Page 01-194 onwards => under "Reading measured value block".
Notes on fault code 18266 / P1858 for vehicle models with CAN bus:
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◆ Engine speed signal is transmitted from engine control unit via CAN bus wire to gearbox control unit.
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◆ Fault detection conditions: Fault in component concerned is diagnosed by engine control unit. This fault diagnosis is transmitted via CAN bus wire to gearbox control unit.
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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18269 P1861
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Open circuit in wiring or short circuit between accelerator position sender -G79 and engine control unit
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- Use current flow diagram to check wiring and connectors 1)
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Accelerator position sender -G79
Fault message from engine control unit
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Accelerator position sender -G79 defective
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- Read out stored engine control unit fault code and eliminate fault
Check identification of engine control unit
=> Refer to Engine Workshop Manual; Repair Group 01; Self-diagnosis
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1) Start by checking connectors for contact corrosion/ingress of water and replace if necessary.
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Display on VAS 5051
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Possible cause of trouble
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Fault remedy
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65535
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Control unit defective
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Automatic gearbox control unit -J217 defective
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- Replace control unit => Page 01-6
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Notes on fault code 65535:
Establish possible cause of trouble and eliminate the following faults:
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◆ Mechanical faults
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◆ Hydraulic faults
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◆ Electr./electronic components and wiring
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