P0963
DTC P0961-P0963Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach.
- Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0961
Line Pressure Control Solenoid Valve Performance
DTC P0962
Line Pressure Control Solenoid Valve Control Circuit Low Voltage
DTC P0963
Line Pressure Control Solenoid Valve Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Line Pressure Control Solenoid Valve Performance Test Status
Line Pressure Control Solenoid Valve Control Circuit Low Voltage Test Status
Line Pressure Control Solenoid Valve Control Circuit High Voltage Test Status
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 400 RPM or greater for 5.0 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 5.0 seconds.
P0962
The TCM detects a short to ground on the line PC solenoid control circuit for 2 seconds.
P0963
The TCM detects an open or a short to voltage on the line PC solenoid control circuit for 5 seconds.
Action Taken When the DTC Sets
P0961 or P0963
- DTCs P0961 and P0963 are Type B DTCs.
- The TCM freezes transmission adaptive functions.
- The TCM commands maximum line pressure.
P0962
- DTC P0962 is a Type A DTC.
- The TCM limits the transmission to Reverse and 5th gear operation.
- The TCM inhibits the torque converter clutch (TCC).
- The TCM commands maximum line pressure.
- The TCM freezes transmission adaptive functions.
- The TCM turns the HSD OFF.
- The TCM inhibits Tap Up/Down function.
- The TCM inhibits manual shifting of forward gears.
- The TCM enables torque management.
Conditions for Clearing the DIC/DTC
- DTCs P0961 and P0963 are Type B DTCs.
- DTC P0962 is a Type A DTC.
Reference Information
Connector End View Reference
- Component Connector End Views
- Inline Harness Connector End Views
Description and Operation
Transmission General Description
Electrical Information Reference
- Circuit Testing
- Connector Repairs
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Special Tools
DT-47825-20 Adapter Harness
For equivalent regional tools, refer to Special Tools.
Circuit/System Verification
1. Engine running in Park position. Move the gear shift lever into each gear position and back into Park position. Verify with a scan tool the following test status parameters displays 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
2. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the conditions for running fault codes (DTC). You may also operate the vehicle within the conditions you observe from the freeze frame/failure records. If the vehicle passes the circuit/system verification procedure, then stop. Do not perform the circuit/system test or component test as this may result in unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections.
Circuit/System Testing
1. Note
You must perform the Circuit/System Verification first.
Remove control solenoid valve assembly Q8 with ignition OFF. See Replacing control solenoid valve assembly and transmission control module.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. Control Solenoid Valve and Transmission Control Module Assembly Inspection
3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
4. Connect the DT-47825-20 harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
5. Ignition ON, 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 any test status parameter displays Fault or Malfunction, replace the Q8 control solenoid valve assembly.
Repair Instructions
Note
- Perform the Transmission Adaptive Values Learn following all transmission related repairs. Programming and Relearning
- Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection. Control Solenoid Valve and Transmission Control Module Assembly Inspection
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for control solenoid valve assembly replacement, setup, and programming