2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2920

2010 Cadillac Truck Escalade RWD V8-6.0L Hybrid Page 2920

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

Typical Scan Tool Data

Circuit/System Description

The clutch pressure control (PC) solenoid 4 is part of the control solenoid valve assembly which has no serviceable parts. 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, P2720, or P2721

* DTCs P2719, P2720, or P2721 have not set this ignition.

* The ignition voltage is 8.6 volts or greater.

* The engine speed is 500 RPM or greater, for 5 seconds.

* The clutch PC solenoid 4 is commanded ON.

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.