2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1687

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1687

Transmission/Control Solenoid Valve and Transmission Control Module Assembly Inspection).

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

Control Module References (See: Testing and Inspection/Programming and Relearning) for control solenoid valve assembly replacement, setup, or

programming

6T70/6T75 - Automatic Transmission

DTC P0961-P0963

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 P0961

- Line Pressure Control (PC) Solenoid System Performance

DTC P0962

- Line Pressure Control (PC) Solenoid Control Circuit Low Voltage

DTC P0963

- Line Pressure Control (PC) Solenoid Control Circuit High Voltage

Diagnostic Fault Information

Circuit/System Description

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

PC solenoid regulates and directs the PC solenoid oil pressure to the pressure regulator valve and isolator valve. Increasing line PC solenoid

pressure increases transmission line pressure. The transmission control module (TCM) varies the current to the line PC solenoid through a low side

driver. Decreasing the current to the line PC solenoid increases line PC solenoid oil pressure by closing OFF the solenoid exhaust port. Increasing

the current to the line PC solenoid decreases line PC oil pressure by opening the solenoid exhaust port. Line PC solenoid 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

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

* The ignition voltage is 8.6 volts or greater.

Conditions for Setting the DTC

P0961

The TCM detects an internal electrical malfunction of the line PC solenoid where the measured line PC solenoid current does not equal the

commanded line PC solenoid current for 5 seconds.

P0962

The TCM detects a short to ground or an open/high resistance on the line PC solenoid control circuit for 1 second.

P0963

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

Action Taken When the DTC Sets