2ML70 - Automatic Transmission
DTC P0751
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P0751
- Shift Solenoid (SS) 1 Valve Performance - Stuck Off
Circuit/System Description
The shift solenoid 1 and transmission control module (TCM) are part of the control solenoid valve assembly and are not serviced separately. The TCM supplies 12 V to shift solenoid 1 on the high side driver 1 circuit. The TCM controls the normally closed shift solenoid 1 on the shift solenoid 1 control circuit. The shift solenoid 1 controls the transmission fluid to the 1-3 clutch regulator valve assembly and the 2-3-4 clutch regulator valve assembly.
Conditions for Running the DTC
Gear 1 gear 2, gear 3, or gear 4 is commanded.
Conditions for Setting the DTC
The TCM detects shift solenoid valve 1 is OFF when commanded ON.
Action Taken When the DTC Sets
P0751 is a Type A DTC.
Conditions for Clearing the DTC
P0751 is a Type A DTC.
Reference Information
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Verification
1. Verify that P0721, P0722, P0723, P0966, P0967, P0969, P0970, P0971, P0973, P0974, P0976, P0977, P2720, P2721, P2728, P2729, or P2730 is not set.
• If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
2. Perform the Transmission Fluid Level and Condition Check Transmission Fluid Level and Condition Check.
3. Perform the Line Pressure Check Line Pressure Check.
4. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
5. Perform the Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test Control Solenoid Valve and Transmission Control Module Assembly Solenoid Performance Test.
• If the shift solenoid 1 is found to be leaking or stuck OFF, replace the Q8 control solenoid valve assembly.
• If the Q8 control solenoid valve assembly tests normal, inspect the valve body components and hydraulic circuits for a leak or a stuck valve. Carefully inspect each component for that condition. Repair or replace as necessary.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Control Valve Upper Body Replacement 2ML70 - Automatic Transmission for Control Valve Body repair or replacement.
* Control Module References Control Module References for Control Solenoid Valve Assembly replacement, programming and setup.
* Perform the Reset Transmission Adapts 2ML70 - Automatic Transmission following all transmission related repairs.