2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1959

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1959

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.

P2721

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

Action Taken When the DTC Sets

P2719

* DTC P2719 is a Type C DTC.

* The TCM freezes transmission adaptive functions on the 2-6 clutch.

P2720

* DTC P2720 is a Type A DTC.

* The TCM commands maximum line pressure.

* The TCM freezes transmission adaptive functions.

* The TCM inhibits manual shifting of forward gears.

* The TCM limits the transmission to 2nd gear.

P2721

* DTC P2721 is a Type A DTC.

* The TCM commands maximum line pressure.