For 1990-2009 cars

### 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 Descriptor

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 | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Line PC Solenoid Control | P0962 | P0963 | P0963 | P0961
Line PC Solenoid High Side Driver 2 | P1833 | P1833 | P1834 | P0961

### Typical Scan Tool Data

#### Line PC Solenoid

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
High Side Driver 2 CKT Status | Open/Short to GND | Open/Short to GND | Short to Volts

### Circuit/System Description

The line pressure control (PC) solenoid is part of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The line PC solenoid regulates the transmission fluid line pressure. 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 is accomplished by varying the desired line pressure in kPa (psi).

### Conditions for Running the DTC

#### P0961

• | DTC P0961 is not failed this ignition.

• | The engine run time is greater than 5 seconds.

• | The line PC solenoid is commanded ON or OFF.

#### P0962

• | DTC P0962 is not failed this ignition.

• | The engine run time is greater than 5 seconds.

• | The line PC solenoid is commanded ON or OFF.

#### P0963

• | DTC P0963 is not failed this ignition.

• | The engine run time is greater than 5 seconds.

• | The line PC solenoid is commanded ON or OFF.

### Conditions for Setting the DTC

#### P0961

The TCM detects an internal electrical performance malfunction of the line PC solenoid control circuit and the actual line pressure does not equal the commanded line pressure for 300 milliseconds.

#### 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

#### 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.

#### P0961, P0963

• | DTCs P0961 and P0963 are Type C DTCs.

• | 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

When attempting to set solenoid electrical DTCs, make sure the TCM is warmed up and the transmission is operated in 2nd gear long enough to make sure 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

#### Connector End View Reference

Component Connector End Views

#### 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

### Circuit/System Testing

1. Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
2. Operate the vehicle in 2nd gear long enough to make sure at least a 3°C (5°F) rise in TCM temperature, then operate the vehicle in Park for 5 seconds.
3. Observe the scan tool data parameter Line PC Sol. CKT Status, the parameter should display OK.

⇒ | If the parameter displays Open, Short to Volts, Short to GND or if the DTC resets, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection.

⇒ | If no concerns are found during the inspection, replace the control solenoid (w/body and TCM) valve assembly.

### Repair Instructions

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control solenoid (w/body and TCM) valve assembly replacement. Refer to Control Module References for replacement, setup, and programming.