Service Information

Volt

DTC P2719-P2721

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 P2719: Pressure Control Solenoid 4 System Performance

DTC P2720: Pressure Control Solenoid 4 Control Circuit Low Voltage

DTC P2721: Pressure Control Solenoid 4 Control Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Clutch Pressure Control Solenoid 4 Control	P2720	P2721	P2721	P2719

Circuit/System Description

The transmission control module supplies 12 volts to the clutch pressure control solenoid 4 through the high side driver 1 circuit. The transmission control module controls the clutch pressure control solenoid 4 through the clutch pressure control solenoid 4 control circuit. The normally low clutch pressure control solenoid 4 directs fluid flow to the 1-3 reverse clutch, or cools motor 1 depending on shift solenoid 1 position, when commanded ON and exhausts fluid when commanded OFF. The clutch pressure control solenoid 4 regulates the transmission fluid pressure to the 1-3 reverse clutch. The clutch pressure control solenoid 4 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 11-16 V.

Conditions for Setting the DTC

P2719

The transmission control module detects an internal electrical performance malfunction of the clutch pressure control solenoid 4 control circuit for 1 second.

P2720

The transmission control module detects an internal low voltage electrical malfunction of the clutch pressure control solenoid 4 control circuit for 1 second.

P2721

The transmission control module detects an internal high voltage electrical malfunction of the clutch pressure control solenoid 4 control circuit for 1 second.

Action Taken When the DTC Sets

•	P2719 is a Type B DTC.

•	P2720 and P2721 are Type A DTCs.

Conditions for Clearing the DTC

•	P2719 is a Type B DTC.

•	P2720 and P2721 are Type A DTCs.

Diagnostic Aids

When this fault is present the system waits for a performance or clutch slip DTC to set.

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 Pressure Control Solenoid Valve 4 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.