Cruze

DTC P2719-P2721

The clutch pressure control (PC) solenoid 4 is part of the control solenoid valve assembly which has no serviceable components. The normally low clutch PC solenoid 4 regulates and directs oil pressure to the 2-6 clutch regulator valve. Increasing clutch PC solenoid 4 pressure increases pressure to the 2-6 clutch. The transmission control module (TCM) PC solenoid 4 low side driver varies current to the solenoid. Increasing the current to the clutch PC solenoid 4 increases oil pressure by closing off the solenoid exhaust port. Decreasing the current to the clutch PC solenoid 4 decreases oil pressure by opening the exhaust port. PC solenoid 4 power 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.

P2719, P2720, or P2721

P2719

The TCM detects an internal electrical performance malfunction of the clutch PC solenoid 4 control circuit where the measured clutch PC solenoid 4 current does not equal the commanded clutch PC solenoid 4 current for 5 seconds.

P2720

The TCM detects a short-circuit to ground on the clutch PC solenoid 4 control circuit for 1 second.

P2721

The TCM detects an open or short-circuit to voltage on the clutch PC solenoid 4 control circuit for 1 second.

P2719

P2720

P2721

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 second gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in PARK for 5 seconds.
2. Operate the vehicle in drive range. Allow the transmission to change through all forward gear ranges. Verify with a scan tool, the following test status parameters display OK.

•	Pressure Control Solenoid Valve 4 Performance Test Status

•	Pressure Control Solenoid Valve 4 Control Circuit High Voltage Test Status

•	Pressure Control Solenoid Valve 4 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.

•	Pressure Control Solenoid Valve 4 Performance Test Status

•	Pressure Control Solenoid Valve 4 Control Circuit High Voltage Test Status

•	Pressure Control Solenoid Valve 4 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.