6T30/6T40/6T45 - Automatic Transmission
DTC P0961-P0963
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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
Typical Scan Tool Data
Circuit/System Description
The line pressure control (PC) solenoid is part of the control solenoid (w/body and TCM) valve assembly which has no serviceable parts. The normally high line PC solenoid regulates and directs the PC solenoid oil pressure to the pressure regulator 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
P0961, P0962, or P0963
* The engine speed is 500 RPM or greater for 5 seconds.
* The ignition voltage is between 9.0 volts and 18.0 volts.
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 on the line PC solenoid control circuit for 1 second.
P0963
The TCM detects an open circuit or short to voltage on the line PC solenoid control circuit for 1 second.
Action Taken When the DTC Sets
P0961, P0963
* DTCs P0961 and P0963 are Type C DTCs.
* The TCM freezes transmission adaptive functions.
P0962
* DTC P0962 is a Type A DTC.
* The TCM defaults the transmission to 5th gear and reverse.
* The TCM inhibits the torque converter clutch (TCC).
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM turns the high side driver OFF.
* The TCM inhibits Tap Up/Down function.
* The TCM inhibits manual shifting of forward gears.
Conditions for Clearing the DIC/DTC
* DTCs P0961 and P0963 are Type C DTCs.
* DTC P0962 is a Type A DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics 6T30/6T40/6T45 - Automatic Transmission
Connector End View Reference
* Component Connector End Views Connector End Views By Name
* Inline Harness Connector End Views Connector End Views By Number
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
DT-48616-10 - Jumper Harness
For equivalent regional tools, refer to Special Tools 6T30/6T40/6T45 - Automatic Transmission.
Circuit/System Verification
1. Engine running in PARK position. Move the gear shifter lever into each gear position and back into PARK position. Verify with a scan tool, the following test status parameters display OK.
* Line PC Sol Perf Test Status
* Line PC Sol Ckt High Volt Test Status
* Line PC Sol Ckt Low Volt Test Status
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the control solenoid (w/body and TCM) assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement 6T30/6T40/6T45 - Automatic Transmission.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
3. Place the control solenoid (w/body and TCM) valve assembly on a clean work surface near the transmission assembly.
4. Connect DT-48616-10 - harness between the vehicle wire harness electrical connector, and the control solenoid (w/body and TCM) valve assembly electrical connector.
5. Ignition ON, verify with a scan tool the following test status parameters display OK.
* Line PC Sol Perf Test Status
* Line PC Sol Ckt High Volt Test Status
* Line PC Sol Ckt Low Volt Test Status
• If any test status parameter displays Fault or Malfunction, replace the control solenoid (w/body and TCM) valve assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
* Refer to Control Module References Programming and Relearning for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
* Perform the Service Fast Learn Adapts 6T30/6T40/6T45 - Automatic Transmission following all transmission related repairs.
* Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning Control Solenoid Valve and Transmission Control Module Assembly Cleaning procedure.