2ML70 - Automatic Transmission

DTC P0756

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 P0756
- Shift Solenoid (SS) 2 Valve Performance - Stuck Off

Circuit/System Description

The shift solenoid valve 2 is part of the control solenoid valve assembly and is 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 2 on the shift solenoid 2 control circuit. The shift solenoid 2 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 3, 4, or EVT 2 is commanded.

Conditions for Setting the DTC

The TCM detects shift solenoid valve 2 is OFF when commanded ON.

Action Taken When the DTC Sets

P0756 is a Type B DTC.

Conditions for Clearing the DTC

P0756 is a Type B 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 2 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 and hydraulic circuits for a leak or a stuck valve.

6. Listed in the chart below are conditions for each component that could set DTC P0756. Carefully inspect each component for that condition. Repair or replace as necessary.





Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Control Module References Control Module References for Q8 Control Solenoid Valve Assembly replacement, programming and setup.
* Control Valve Upper Body Replacement 2ML70 - Automatic Transmission for Control Valve Body repair or replacement.
* Perform the Reset Transmission Adapts 2ML70 - Automatic Transmission following all transmission related repairs.