Diagnostic 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 (PC) Solenoid System PerformanceDTC 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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Line PC Solenoid Control | P0962 | P0963 | P0963 | P0961 |
Typical Scan Tool Data
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK | |||
Line PC Sol. CKT Status | Short to GND | Open/Short to Volts | Open/Short to Volts |
Circuit/System Description
The line pressure control (PC) solenoid is part of the control solenoid (w/body and TCM) valve assembly. The control solenoid (w/body and TCM) valve assembly has no seviceable parts. The TCM varies the current to the normally high line PC solenoid valve from 0.1 amp for maximum line pressure, to 1.1 amps for minimum line pressure. This allows the PC solenoid to regulate the transmission fluid line pressure.
Conditions for Running the DTC
P0961
| • | The engine run time is greater than 12 seconds. |
| • | The ignition voltage is between 9.0 volts and 19.0 volts. |
| • | The line PC solenoid is commanded ON. |
| • | DTC P0961 has not failed this ignition cycle. |
P0962
| • | The engine run time is greater than 5 seconds. |
| • | The ignition voltage is between 9.0 volts and 19.0 volts. |
| • | The line PC solenoid is commanded ON. |
| • | DTC P0962 has not failed this ignition cycle. |
P0963
| • | The engine run time is greater than 5 seconds. |
| • | The ignition voltage is between 9.0 volts and 19.0 volts. |
| • | The line PC solenoid is commanded ON. |
| • | DTC P0963 has not failed this ignition cycle. |
Conditions for Setting the DTC
P0961
The TCM detects an internal electrical performance malfunction of the line PC solenoid control circuit where the actual line pressure does not equal the commanded line pressure for 10.5 seconds.
P0962
The TCM detects an internal low voltage electrical malfunction of the line PC solenoid control circuit for 300 milliseconds.
P0963
The TCM detects an internal high voltage electrical malfunction of the line PC solenoid control circuit for 300 milliseconds.
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 3rd gear if the current gear is 1st, 2nd, or 3rd, or 5th gear if the current gear if 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. |
Conditions for Clearing the DIC/DTC
| • | DTCs P0961 and P0963 are Type C DTCs. |
| • | DTC P0962 is a Type A DTC. |
Diagnostic Aids
P0961
DTC P0961 detects an invalid voltage in the transmission line pressure variable bleed solenoid (VBS) control circuit.
P0962
DTC P0962 detects a continuous short to ground in the transmission line pressure VBS control circuit.
P0963
DTC P0963 detects a continuous open or short to voltage in the transmission line pressure VBS control circuit.
When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM under the optimal conditions to test solenoid electrical DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Description and Operation
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
- Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning procedure to dislodge debris and free up valves.
- Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
- Verify that the scan tool data parameter, Line PC Sol. CKT Status, displays OK.
- 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.
| ⇒ | If not the specified value, replace the control solenoid (w/body and TCM) valve assembly. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| Important: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection . |
| • | Refer to Control Module References for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming. |
| • | Perform the Service Fast Learn Adapts following all transmission related repairs. |
| • | Perform the Control Solenoid Valve and Transmission Control Module Assembly Cleaning procedure. |
