Service Information

Volt

DTC P0961-P0963

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 P0961: Line Pressure Control Solenoid System Performance

DTC P0962: Line Pressure Control Solenoid Control Circuit Low Voltage

DTC P0963: Line Pressure Control Solenoid Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Line Pressure Control Solenoid Low Side Driver	P0962	P0963	P0963	P0961

Circuit/System Description

The line pressure control solenoid regulates the transmission fluid line pressure. The transmission control module varies the current to the normally high line pressure control solenoid valve from 0.1 amp for maximum line pressure, to 1.1 amps for minimum line pressure. This is accomplished by varying the current in order to obtain the desired line pressure in kPa (psi). The line pressure control solenoid is part of the control solenoid valve assembly and is not serviced separately.

Conditions for Running the DTC

•	The propulsion system is active.

•	The system voltage is 11-18 volts.

Conditions for Setting the DTC

P0961

The transmission control module detects an internal electrical performance malfunction of the line pressure control solenoid control circuit for 5 seconds.

P0962

The transmission control module detects an internal low voltage electrical malfunction of the line pressure control solenoid control circuit for 300 milliseconds.

P0963

The transmission control module detects an internal high voltage electrical malfunction of the line pressure control solenoid control circuit for 300 milliseconds.

Action Taken When the DTC Sets

•	DTC P0961 is a Type B DTC.

•	DTCs P0962 and P0963 are Type A DTCs.

DTC P0962

The transmission control module commands maximum line pressure.

Conditions for Clearing the DTC

•	DTC P0961 is a Type B DTC.

•	DTCs P0962 and P0963 are Type A DTCs.

Reference Information

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 Line Pressure Control Solenoid Valve Test Status parameters. The reading should display OK.

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

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Control Solenoid Valve and Transmission Control Module Assembly Inspection for Control Solenoid Valve Assembly inspection.

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