DTC P0751 or P0752
Diagnostic Instructions
DTC Descriptors
DTC P0751: Shift Solenoid 1 Valve
Performance - Stuck Off
DTC P0752: Shift Solenoid 1 Valve
Performance - Stuck On
Circuit/System Description
The shift solenoid (SS) valve 1 is part of the control
solenoid valve assembly, which has no serviceable components. The
SS valve 1 is a normally closed (NC) solenoid valve and
controls fluid pressure to the clutch select valve. When
SS valve 1 is commanded on, fluid pressure acts on the
clutch select valve, moving the valve to another position. Fluid
from the R1/4-5-6 regulator valve flows though the clutch select
valve and is directed to either the low and reverse clutch or the
4-5-6 clutch, depending on the position of the clutch select
valve.
Conditions for Running the DTC
• |
DTC P0101, P0102, P0103, P0106, P0107, P0108,
P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205,
P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305,
P0306, P0307, P0308, P0401, P042E, P0716, P0717, P0722, P0723, or
P182E is not set. |
• |
The transmission fluid temperature (TFT) is
-7°C (19°F) or greater. |
• |
The engine speed is greater than 400 RPM for
5 seconds. |
• |
The output shaft speed is greater than 0 RPM
or the throttle is greater than 0.5 percent. |
• |
The ignition voltage is 9.0 volts or
greater. |
• |
The engine torque signal is valid. |
• |
The throttle position signal is valid. |
• |
The High-Side driver is enabled. |
Conditions for Setting the DTC
P0751
The transmission control module (TCM) detects gear slip
greater than 400 RPM for 1.5 seconds with 1st gear
commanded and the closest gear ratio is 4th gear. This must
occur 8 times.
P0752
The TCM detects gear slip greater than 400 RPM for
1.5 seconds when 3rd gear is commanded. This must occur
5 times.
Action Taken When the DTC Sets
P0751
• |
DTC P0751 is a type B DTC. |
• |
The TCM inhibits 1st gear. |
• |
The transmission control module (TCM)
inhibits Neutral tick-over. |
P0752
• |
DTC P0752 is a type A DTC. |
• |
The TCM limits the transmission to 2nd range and
reverse. |
• |
The TCM inhibits Tap Up/Down function. |
• |
The TCM inhibits manual shifting of forward
gears. |
• |
The TCM disables neutral tick-over. |
• |
The TCM freezes adapts. |
• |
The TCM commands maximum line pressure. |
Conditions for Clearing the DTC
P0751
DTC P0751 is a type B DTC.
P0752
DTC P0752 is a type A DTC.
Reference Information
Schematic Reference
Drive Range, First Gear Engine Braking
Connector End View Reference
Description and Operation
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Perform the
Transmission Fluid Level and Condition Check to verify correct
fluid level and condition.
- From a stop, accelerate to 72 km/h (45 mph)
with the calculated throttle position greater than 15 percent.
Perform this test 8 times. The DTCs should not set.
- Verify the scan tool Shift Solenoid Valve 1 and
Gear Ratio parameters are correct for each gear range. Refer to
Shift Solenoid Valve State and Gear Ratio .
- After performing the above steps, verify that the DTC
does not reset by operating the vehicle within the Conditions for
Running the DTC. You may also operate the vehicle within the
conditions you observe from the Freeze Frame/Failure Records data.
If the vehicle passes the Circuit/System Verification procedure,
then STOP. Do not perform the Circuit/System Testing or Component
Testing as this may result in an unnecessary part replacement.
Refer to
Testing for Intermittent Conditions and Poor Connections .
Circuit/System Testing
- Perform the
Line Pressure Check . Verify the transmission line pressures
are within the range specified in the Line PC Solenoid Valve
Pressure table. Refer to
Solenoid Valve Pressure .
- Ignition OFF, remove the Q8 control solenoid valve
assembly.
- Perform the
Control Solenoid Valve and Transmission Control Module Assembly
Solenoid Performance Test .
⇒ |
If the Q8 control solenoid valve assembly does not
pass the performance test, replace the Q8 control solenoid valve
assembly. |
- Listed in the table below, are conditions for each
component that could set DTC P0751 or P0752. Carefully inspect
each component for that condition.
DTCs
|
Component
|
Condition
|
P0751
P0752
|
Control Valve Body
|
Clutch select valve stuck - debris, sediment, binding, or scored
bore
|
P0751
|
Control Valve Body
|
Bore Plug - Clutch Select Valve - Undersized bore plug causing a
leak. Plug should be a valve fit in the bore.
|
P0751
|
Control Valve Body
|
Check ball #1 missing, damaged/malformed, Seat in the valve body
damage/leaking.
|
P0751
P0752
|
Q8 Control Solenoid Valve Assembly
|
• |
Not pressurising - Stuck OFF or leaking |
• |
Not exhausting - Stuck On |
• |
Control signal fluid supply leak - valve body
filter plate assembly cracked or damaged gasket seal |
|
P0751
P0752
|
Control Valve Body
|
Low and Reverse and 4-5-6 Clutch Regulator Valve Stuck or
sticking - debris, sediment, binding, or scored bore
|
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic
procedure.
|