2010 Cadillac Truck SRX FWD V6-3.0L Page 1802
replacement, setup and programming.
* TCM-Refer to Control Module References (See: Testing and Inspection/Programming and Relearning) for replacement, setup and
programming.
* Perform the Transmission Adaptive Functions (See: Transmission and Drivetrain/Automatic Transmission/Transaxle/Description and
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) for replacement.
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
