Service Information

Volt

DTC P0973 or P0974

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 P0973: Shift Solenoid (SS) 1 Control Circuit Low Voltage

DTC P0974: Shift Solenoid (SS) 1 Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Shift Solenoid (SS) 1 Control	P0973	P0974	P0974	--

The control solenoid valve assembly supplies 12 volts to shift solenoid 1 on the high side driver 1 circuit. The control solenoid valve assembly controls the normally closed shift solenoid 1 on the shift solenoid 1 control circuit. The shift solenoid 1 is part of the control solenoid valve assembly and is not serviced separately.

Conditions for Running the DTC

The system voltage is 11-16 V.

Conditions for Setting the DTC

P0973

The control solenoid valve assembly detects an internal low voltage electrical malfunction of the shift solenoid 1 control circuit for 1 second.

P0974

The control solenoid valve assembly detects an internal high voltage electrical malfunction of the shift solenoid 1 control circuit for 1 second.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information.

Circuit/System Verification

Vehicle ON, verify the transmission fluid temperature is between 50-80°C (122-176°F).
Drive the vehicle, observe the scan tool Shift Solenoid Valve 1 Control Circuit Test Status parameters. The reading should display OK.

⇒	If the reading is not within the specified range, replace the Q8 control solenoid valve assembly.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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