Volkswagen Workshop Service and Repair Manuals

Fault table: Fault codes 16485...18076   Note A new fault code listing has been introduced and positioned where the well known five digit V.A.G fault was listed previously, the possible causes are described in greater detail with the new codes. The fault text has not changed greatly. In addition a new type of fault code, the so called P codes e.g. P0101, is listed and positioned next to the existing codes. These P codes have no significance at present, but will be required by self-diagnosis systems in the future.   Note 17664 P1256…030 coolant temperature sender -G62- open circuit/short to positive sporadic fault   Note t  17664 = Fault code t  P1256 = Additional fault code t  030 = Fault type as number t  Coolant temperature sender -G62- = faulty current path or fault location t  Open circuit/short to positive = fault type as text t  Sporadic faults = Faults that are not always present e.g. loose contact

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16485 P0101
Air mass meter -G70-
	Implausible signal	t  Defective air mass meter -G70- t  Wiring open circuit/short to earth	t  Reduced performance t  Black smoke	–  Check air mass meter -G70- → Chapter
16685 P0301
Misfiring recognised
	No. 1 Cyl.	t  No combustion in No. 1 Cyl. t  No compression pressure	t  Reduced performance t  Engine runs rough t  Increased exhaust emissions	–  Checking compression → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16686 P0302
Misfiring recognised
	No. 2 Cyl.	t  No combustion in No. 2 Cyl. t  No compression pressure	t  Reduced performance t  Engine runs rough t  Increased exhaust emissions	–  Checking compression → Chapter
16687 P0303
Misfiring recognised
	No. 3 Cyl.	t  No combustion in No. 3 Cyl. t  No compression pressure	t  Reduced performance t  Engine runs rough t  Increased exhaust emissions	–  Checking compression → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16705 P0321
Engine speed sender -G28-
	Implausible signal	t  Defective engine speed sender -G28- t  Wiring open or short circuit t  Gap speed sender/sender wheel too large t  Metal swarf on engine speed sender -G28- t  Engine speed sender -G28- loose	t  Engine stalls t  Engine runs rough t  Glow period warning lamp flashes t  Increased exhaust emissions t  Rev. counter no display	–  Check engine speed sender -G28- → Chapter
16706 P0322
Engine speed sender -G28-
	No signal	t  Defective engine speed sender -G28- t  Wiring open or short circuit	t  Engine will not start t  Engine stalls t  Glow period warning lamp flashes t  Rev. counter no display	–  Check engine speed sender -G28- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16725 P0341
Camshaft position sender
	Implausible signal	t  Hall sender -G40- defective t  Hall sender -G40- incorrect or incorrectly secured t  Gap dimension between Hall sender -G40- and camshaft toothed belt pulley not OK. t  Wiring open circuit/short to earth	t  Time to start engine has increased	–  Check Hall sender -G40- → Chapter
		t  Hub with sender wheel on camshaft is twisted or loose	t  Engine will not start t  Engine stalls	–  Check positions of camshaft and sender wheel → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16885 P0501
Vehicle speed signal
	Implausible signal	t  No signal from speedometer sender -G22-	t  Speedometer display not OK t  Cruise control system switched off t  Vehicle jerks when changing gear t  Air conditioner is switched off	–  Check signal from speedometer sender -G22- → Chapter
16944 P0560
Voltage supply
	Implausible signal	t  Terminal 30 voltage supply relay -J317- defective t  Relay sticks (sporadically)	t  Engine will not start t  Various running problems including engine will not start	–  Check voltage supply for diesel direct injection system control unit -J248- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
16946 P0562
Voltage supply
	Voltage too low	t  Voltage supply less than 4 V	t  Engine will not start t  Various running problems including engine will not start	–  Check voltage supply for diesel direct injection system control unit -J248- → Chapter
16947 P0563
Voltage supply
	Voltage too great	t  Voltage supply more than 20 V
16989 P0605
Control unit defective		t  Internal defect in diesel direct injection system control unit -J248-	t  Various running problems t  Engine stops	–  Renew diesel direct injection system control unit -J248- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17552 P1144
Air mass meter -G70-
	Open circuit/short to earth	t  Defective air mass meter -G70- t  Wiring open circuit/short to earth	t  Reduced performance t  Black smoke	–  Check air mass meter -G70- → Chapter
17553 P1145
Air mass meter -G70-
	Short to positive	t  Defective air mass meter -G70- t  Wiring open circuit or short to positive	t  Reduced performance t  Black smoke	–  Check air mass meter -G70- → Chapter
17554 P1146
Air mass meter -G70-
	Supply voltage	t  Operating voltage too high or too low t  Wiring open circuit	t  Reduced performance t  Black smoke	–  Check air mass meter -G70- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17563 P1155
Intake manifold pressure sender -G71-
	Short to positive	t  Short to positive t  Defective intake manifold pressure sender -G71-	t  Reduced performance	–  Check intake manifold pressure sender -G71- → Chapter
17564 P1156
Intake manifold pressure sender -G71-
	Open circuit/short to earth	t  Defective intake manifold pressure sender -G71- t  Wiring open circuit/short to earth	t  Reduced performance t  Increased exhaust emissions	–  Check intake manifold pressure sender -G71- → Chapter
17565 P1157
Intake manifold pressure sender -G71-
	Supply voltage	t  Defective intake manifold pressure sender -G71- t  Wiring open or short circuit	t  Reduced performance t  Increased exhaust emissions	–  Check intake manifold pressure sender -G71- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17568 P1160
Intake manifold temperature sender -G72-
	Short to earth	t  Defective intake manifold temperature sender -G72- t  Wiring short to earth	t  Goes to preset value of 135.9 °C t  Engine preheating not functioning	–  Check intake manifold temperature sender -G72- → Chapter
17569 P1161
Intake manifold temperature sender -G72-
	Open circuit/short to positive	t  Defective intake manifold temperature sender -G72- t  Wiring open circuit or short to positive	t  Goes to preset value of 135.9 °C t  Engine preheating not functioning	–  Check intake manifold temperature sender -G72- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17570 P1162
Fuel temperature sender -G81-
	Short to earth	t  Fuel temperature sender -G81- defective t  Wiring short to earth	t  Increased exhaust emissions	–  Check fuel temperature sender -G81- → Chapter
17571 P1163
Fuel temperature sender -G81-
	Open circuit/short to positive	t  Fuel temperature sender -G81- defective t  Wiring open circuit or short to positive	t  Increased exhaust emissions	–  Check fuel temperature sender -G81- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17663 P1255
Coolant temperature sender -G62-
	Short to earth	t  Coolant temperature sender -G62- defective t  Wiring short to earth	t  Black smoke when starting t  Glow period is always approx. 20 seconds t  Engine preheating not functioning	–  Check coolant temperature sender -G62- → Chapter
17664 P1256
Coolant temperature sender -G62-
	Open circuit/short to positive	t  Coolant temperature sender -G62- defective t  Wiring open circuit or wiring short to positive	t  Black smoke when starting t  Glow period is always approx. 20 seconds t  Engine preheating not functioning	–  Check coolant temperature sender -G62- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17668 P1260
Unit injector solenoid valve, No. 1 cyl. -N240-
	Implausible signal	t  Unit injector valve, No. 1 cyl. -N240- cannot be controlled	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter
17669 P1261
Unit injector solenoid valve, No. 1 cyl. -N240-
	Control limit exceeded	t  Control period too long t  Transfer resistance	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17670 P1262
Unit injector solenoid valve, No. 1 cyl. -N240-
	Control limit not reached	t  Control period too short t  Shortage of fuel t  Air in fuel system	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter –  Check fuel supply system → Chapter
17671 P1263
Unit injector solenoid valve, No. 2 cyl. -N241-
	Implausible signal	t  Unit injector valve, No. 2 cyl. -N241- cannot be controlled	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17672 P1264
Unit injector solenoid valve, No. 2 cyl. -N241-
	Control limit exceeded	t  Control period too long t  Transfer resistance	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter
17673 P1265
Unit injector solenoid valve, No. 2 cyl. -N241-
	Control limit not reached	t  Control period too short t  Shortage of fuel t  Air in fuel system	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter –  Check fuel supply system → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17674 P1266
Unit injector solenoid valve, No. 3 cyl. -N242-
	Implausible signal	t  Unit injector valve, No. 3 cyl. -N242- cannot be controlled	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter
17675 P1267
Unit injector solenoid valve, No. 3 cyl. -N242-
	Control limit exceeded	t  Control period too long t  Transfer resistance	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17676 P1268
Unit injector solenoid valve, No. 3 cyl. -N242-
	Control limit not reached	t  Control period too short t  Shortage of fuel t  Air in fuel system	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter –  Check fuel supply system → Chapter
17795 P1387
Control unit defective		t  Internal defect in diesel direct injection system control unit -J248-	t  Various running problems t  Engine stops	–  Renew diesel direct injection system control unit -J248- → Chapter
17810 P1402
Exhaust gas recirculation valve -N18-
	Short to positive	t  Short to positive	t  No exhaust gas recirculation	–  Check exhaust gas recirculation valve -N18- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17849 P1441
Exhaust gas recirculation valve -N18-
	Open circuit/short to earth	t  Wiring open circuit t  Exhaust gas recirculation valve -N18- defective	t  No exhaust gas recirculation	–  Check exhaust gas recirculation valve -N18- → Chapter
		t  Short to earth	t  Too much exhaust gas recirculation t  Reduced performance t  Black smoke
17948 P1540
Vehicle speed signal
	Signal too large	t  Road speed more than 260 km/h t  Dash panel insert defective	t  Speedometer display not OK t  Cruise control system switched off t  Vehicle jerks when changing gear t  Air conditioner is switched off	–  Check signal from speedometer sender -G22- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17954 P1546
Charge pressure control solenoid valve -N75-
	Short to positive	t  Short to positive	t  Reduced performance t  Charge pressure too low	–  Check charge pressure control solenoid valve -N75- → Chapter.
17957 P1549
Charge pressure control solenoid valve -N75-
	Open circuit/short to earth	t  Wiring open circuit t  Defective charge pressure control solenoid valve -N75-	t  Reduced performance t  Charge pressure too low	–  Check charge pressure control solenoid valve -N75- → Chapter.
		t  Short to earth	t  Reduced performance t  Charge pressure too high

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
17958 P1550
Charge pressure
	Control difference	t  Defective charge pressure control solenoid valve -N75- t  Hose connections interchanged, not connected t  Leaks between turbocharger and engine (charge air routing) t  Turbocharger defective	t  Reduced performance	–  Check charge pressure control solenoid valve -N75- → Chapter. –  Checking charge pressure control → Chapter.
17978 P1570
Engine control unit locked		t  Start attempted with a non-authorised key. t  Attempted manipulation t  Short circuit in communication wire t  Fault in system for immobilizer t  Immobilizer control unit defective/missing t  Diesel direct injection system control unit -J248- renewed but has not been adapted to immobilizer.	t  Engine starts briefly and then stops again t  Glow period warning lamp flashes	–  Adapt engine control unit to electronic immobilizer → Chapter. –  Check electronic immobilizer

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18008 P1600
Voltage supply terminal 15
	Voltage too low	t  No current supply when ignition is on (terminal 15)	t  Various running problems including engine will not start	–  Check voltage supply for terminal 15 → Current flow diagrams, Electrical fault finding and Fitting locations
18020 P1612
Engine control unit incorrectly coded
		t  Invalid control unit coding	t  Glow period warning lamp flashes	–  Code control unit → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18024 P1616
Glow period warning lamp -K29-
	Short to positive	t  Short to positive	t  Glow period warning lamp not functioning	–  Check glow period warning lamp -K29- → Chapter
18025 P1617
Glow period warning lamp -K29-
	Open circuit/short to earth	t  Wiring open circuit t  Bulb defective	t  Glow period warning lamp not functioning	–  Check glow period warning lamp -K29- → Chapter
		t  Short to earth	t  Glow period warning lamp permanently on

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18026 P1618
Glow plug relay -J52-
	Short to positive	t  Wire short to positive t  Defective glow plug relay -J52-	t  No glow period t  Poor cold starting t  Glow period warning lamp -K29- flashes	–  Check glow plug relay -J52- → Chapter
18027 P1619
Glow plug relay -J52-
	Open circuit/short to earth	t  Wiring open circuit/short to earth t  Defective glow plug relay -J52-	t  No glow period t  Poor cold starting t  Glow period warning lamp -K29-flashes	–  Check glow plug relay -J52- → Chapter
18034 P1626
Power train data bus
	No message from gearbox CU	t  Fault in data wire to gearbox control unit	t  Various running problems (gear change jolts, load change jolts)	–  Check data bus → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18039 P1631
Accelerator position sender -G79-
	Signal too large	t  Defective accelerator position sender -G79-	t  Increased idling speed	–  Check accelerator position sender -G79- → Chapter
18040 P1632
Accelerator position sender -G79-
	Supply voltage	t  Operating voltage too high or too low t  Wiring open circuit	t  Glow period warning lamp flashes t  Increased idling speed	–  Check accelerator position sender -G79- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18047 P1639
Accelerator position sender -G79- with accelerator position sender 2 -G185-
	Implausible signal	t  Defective accelerator position sender -G79-	t  Increased idling speed	–  Check accelerator position sender -G79- → Chapter
18048 P1640
Control unit defective		t  Internal defect in diesel direct injection system control unit -J248-	t  Various running problems t  Engine stops	–  Renew diesel direct injection system control unit -J248- → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18056 P1648
Power train data bus
	Defective	t  Fault in data wiring to gearbox or ABS control unit t  Fault in system: Automatic gearbox or ABS	t  Various running problems (gear change jolts, load change jolts)	–  Check data bus → Chapter
18057 P1649
Power train data bus
	No message from ABS CU	t  Fault in data wire to ABS control unit	t  Various running problems (gear change jolts, load change jolts)	–  Check data bus → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18071 P1663
Unit injector valve activation
	Short to positive	t  Short to positive in engine wiring harness t  Internal short circuit to positive in engine control unit	t  Engine stops (continuous fault) t  Engine misfiring (sporadic fault)	–  Check unit injector valves → Chapter
18072 P1664
Unit injector valve activation
	Electrical fault in current circuit	t  Wiring open circuit or short circuit to earth in engine wiring harness	t  Engine stops (continuous fault) t  Engine misfiring (sporadic fault)	–  Check unit injector valves → Chapter
18073 P1665
Unit injector valve activation
	Mechanical fault	t  Unit injector defective mechanically	t  Engine misfiring t  Engine stalls	–  Renew unit injector → Chapter

Output on the fault reader -V.A.G 1551- printer		Possible fault cause	Possible effects	Fault elimination
18074 P1666
Unit injector solenoid valve, No. 1 cyl. -N240-
	Electrical fault in current circuit	t  Wiring open circuit or short circuit to earth in engine wiring harness	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter
18075 P1667
Unit injector solenoid valve, No. 2 cyl. -N241-
	Electrical fault in current circuit
18076 P1668
Unit injector solenoid valve, No. 3 cyl. -N242-
	Electrical fault in current circuit	t  Wiring open circuit or short circuit to earth in engine wiring harness	t  Various running problems t  Engine runs rough t  Reduced performance t  Increased exhaust emissions	–  Check unit injector valves → Chapter