Service Information

Volt

DTC P0756

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

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

The shift solenoid valve 2 is part of the control solenoid valve assembly and is not serviced separately. The shift solenoid valve 2 is a normally closed solenoid valve and controls fluid to the hybrid low, 1-2 clutch boost valve assembly and related clutches. During this diagnostic test, intrusive actions are taken by the transmission control module to test the shift solenoid valve 2 to see if the valve is stuck OFF when in dual motor or dual motor and ICE modes.

Conditions for Running the DTC

•	Shifting to dual motor or dual motor and ICE.

•	Line pressure is greater than 325 kPa.

Conditions for Setting the DTC

The transmission control module detects shift solenoid valve 2 is OFF when commanded ON.

Action Taken When the DTC Sets

P0756 is a Type A DTC.

Conditions for Clearing the DTC

P0756 is a Type A DTC.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification

Verify that 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 .

Perform the Transmission Fluid Level and Condition Check .
Perform the Line Pressure Check .
Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
Perform the 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. Refer to Control Valve Body Diagnostic Inspection .

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Control Valve Body Replacement for control valve body replacement.

•	Control Module References for Control Solenoid Valve Assembly and Transmission Control Module Assembly replacement, programming, and setup.