2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1953

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1953

Operation/AF40-6 - Automatic Transmission/Transmission Adaptive Functions).

* Wiring harness-Refer to Automatic Transmission Wiring Harness Replacement (See: Transmission and Drivetrain/Automatic

Transmission/Transaxle/Wiring Harness/Service and Repair).

6T70/6T75 - Automatic Transmission

DTC P2719-P2721

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provides an overview of each diagnostic category.

DTC Descriptors

DTC P2719

- Clutch Pressure Control (PC) Solenoid 4 System Performance

DTC P2720

- Clutch Pressure Control (PC) Solenoid 4 Control Circuit Low Voltage

DTC P2721

- Clutch Pressure Control (PC) Solenoid 4 Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

The clutch pressure control (PC) solenoid 4 is part of the control solenoid valve assembly which has no serviceable components. The normally low

PC solenoid 4 regulates and directs oil pressure to the 2-6 clutch regulator valve. Increasing PC solenoid 4 pressure, increases pressure to the 2-6

clutch regulator valve. The TCM varies the current to the PC solenoid 4 through a low side driver. Increasing the current to PC solenoid 4 increases

oil pressure by closing OFF the solenoid exhaust port. Decreasing the current to 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.

Conditions for Running the DTC

P2719

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* DTC P2719 has not set this ignition cycle.

P2720

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* DTC P2720 has not set this ignition cycle.

P2721

* The engine speed is greater than 400 RPM for 5 seconds.

* The ignition voltage is 8.6 volts or greater.

* DTC P2721 has not set this ignition cycle.

Conditions for Setting the DTC

P2719

The TCM detects an internal electrical malfunction on the clutch PC solenoid 4 control circuit where the measured PC solenoid 4 current does not

equal the commanded clutch PC solenoid 4 current for 5 seconds.

P2720

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