Cruze

DTC P0973 or P0974

The shift solenoid (SS) valve 1 is part of the control solenoid valve assembly which has no serviceable components. SS valve 1 is a normally closed (NC) ON/OFF solenoid and is controlled by the transmission control module (TCM) through a low side driver. When the SS valve 1 is energised (ON), SS 1 fluid pressure is directed to the clutch select valve. Power to the SS 1 is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected the HSD will reset.

P0973 or P0974

P0973

The control solenoid valve assembly detects an internal low voltage electrical malfunction of the SS Valve 1 control circuit for 2 seconds.

P0974

The control solenoid valve assembly detects an internal high voltage electrical malfunction of the SS Valve 1 control circuit for 2 seconds.

P0973

P0974

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

DT-48616-10 Adapter Harness

For equivalent regional tools, refer to Special Tools .

1. Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature.
2. Place the gear selector in Reverse for 5 seconds and then idle vehicle for 5 seconds. Verify with a scan tool, the following test status parameters displays OK.

•	Shift Solenoid Valve 1 Control Circuit Open Test Status

•	Shift Solenoid Valve 1 Control Circuit High Voltage Test Status

•	Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status

3. 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 .

Note: You must perform the Circuit/System Verification first.

1. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection .
3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
4. Connect DT-48616-10 harness between the vehicle wire harness X1 14-way transmission electrical connector, and the Q8 control solenoid valve assembly.
5. Ignition ON, verify with a scan tool the following test status parameters display, OK.

•	Shift Solenoid Valve 1 Control Circuit Open Test Status

•	Shift Solenoid Valve 1 Control Circuit High Voltage Test Status

•	Shift Solenoid Valve 1 Control Circuit Low Voltage Test Status

⇒	If any test status parameter displays Fault or Malfunction, replace the Q8 control solenoid valve assembly.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.