P0963
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 valve assembly which has no serviceable parts. The normally high line PC solenoid regulates and directs the PC solenoid oil pressure to the isolator/pressure regulator valve. Increasing PC solenoid line pressure increases transmission line pressure. The Transmission Control Module 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 Transmission Control Module 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 between 400-7500 RPM for 5 seconds.
* The ignition voltage is between 8.6-32 V.
* DTCs P0961, P0962 or P0963 is not set.
Conditions for Setting the DTC
P0961
The Transmission Control Module 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 Transmission Control Module detects a short to ground or an open/high resistance on the line PC solenoid control circuit for 2 seconds.
P0963
The Transmission Control Module detects a short to voltage on the line PC solenoid control circuit for 5 seconds.
Action Taken When the DTC Sets
P0961
* DTC P0961 is a Type B DTC.
* The TCM freezes transmission adaptive functions.
P0962
* DTC P0962 is a Type A DTC.
* The TCM turns the high side driver OFF.
* The TCM defaults the transmission to 3rd gear if the current gear is 1st, 2nd, or 3rd, or 5th gear if the current gear is 4th, 5th, or 6th gear.
* The TCM inhibits the torque converter clutch (TCC).
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
P0963
* DTC P0963 is a Type B DTC.
* The TCM freezes transmission adaptive functions.
* The TCM commands maximum line pressure.
Conditions for Clearing the DIC/DTC
* DTCs P0961 and P0963 are Type B DTCs.
* DTC P0962 is a Type A DTC.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views Connector End Views By Name
* Inline Harness Connector End Views X101
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 Control Module References for scan tool information
Special Tools
DT-47825-10 - Jumper Harness
For equivalent regional tools, refer to Special Tools Tools and Equipment.
Circuit/System Verification
1. Engine running in Park position, parking brake applied, place the gear select lever in each gear position for 2-3 seconds. Return the gear select lever to the Park position.
2. Verify with a scan tool the following test status parameters display OK:
* Line Pressure Control Solenoid Valve Performance Test Status
* Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status
* Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status
• If Malfunction is displayed
Refer to Circuit/System Testing.
• If Malfunction is not displayed
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observe from the Freeze Frame/Failure Records data.
4. Verify the DTC does not set.
• If the DTC sets
Refer to Circuit/System Testing.
• If the DTC does not set
5. All OK.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement Service and Repair.
2. Verify and inspect the Q8 Control Solenoid Valve Assembly. The Q8 Control Solenoid Valve Assembly must be externally cleaned of all debris and each solenoid resistance value must be within the specified range. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
• If the solenoid resistance is not within the specified ranges
Replace the Q8 Control Solenoid Valve Assembly.
• If the solenoid resistance is within the specified ranges
3. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.
4. Connect DT-47825-10 - jumper harness between the vehicle wire harness electrical connector and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.
5. Verify the scan tool the parameters do not display Malfunction:
* Line Pressure Control Solenoid Performance Test Status
* Line Pressure Control Solenoid Control Circuit High Voltage Test Status
* Line Pressure Control Solenoid Control Circuit Low Voltage Test Status
• If Malfunction is displayed
Replace the Q8 Control Solenoid Valve Assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Perform the Reset Transmission Adapts Reset Procedure following all transmission related repairs.
* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming, and setup.