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 Descriptors

DTC P1831: Pressure Control (PC)/Shift Lock Solenoid Control Circuit Low Voltage
DTC P1832: Pressure Control (PC)/Shift Lock Solenoid Control Circuit High Voltage

### Circuit/System Description

The transmission control module (TCM) high side driver 2 is located inside of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. The high side driver 2 provides the voltage for the TCM pressure control solenoids and shift solenoids. This fault is handled inside the TCM and no external circuits are involved.

### Conditions for Running the DTC

#### P1831

• | Start the ignition voltage, run the engine.

• | High side driver 1 is enabled.

• | DTC P1831 is not set.

#### P1832

DTC P1832 has not failed this ignition.

### Conditions for Setting the DTC

#### P1831

The TCM detects an internal open or short to ground in the high side driver 1 for at least 3 out of 5 samples.

#### P1832

The TCM detects an internal short to voltage in the high side driver 1 for at least 3 out of 5 samples.

### Action Taken When the DTC Sets

#### P1831

• | DTC P1831 is a Type A DTC.

• | The TCM turns OFF all high side drivers.

• | The TCM turns OFF all solenoids.

• | The TCM commands maximum line pressure.

• | The TCM freezes transmission adaptive functions.

• | The TCM commands the TCC OFF.

• | The TCM allows the vehicle to operate in transmission protection mode.

#### P1832

DTC P1832 is a Type C DTC.

### Conditions for Clearing the DTC

• | DTC P1831 is a Type A DTC.

• | DTC P1832 is a Type C DTC.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

• | Automatic Transmission Inline 16-Way Connector End View

• | Automatic Transmission Internal Connector End Views

• | Automatic Transmission Related Connector End Views

#### DTC Type Reference

• | Diagnostic Trouble Code (DTC) Type Definitions

• | Diagnostic Trouble Code (DTC) List/Type

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

### Circuit/System Testing

1. Clear the DTC and operate the vehicle under the conditions for running and setting the DTC.
2. Observe the High Side Driver CKT Status parameter. The parameter should display OK.

⇒ | If the parameter displays Open, Short to Ground, Short to Voltage, or the DTC resets, replace the control solenoid (w/body and TCM) valve assembly. Refer to Control Module References for replacement, setup, and programming.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Service Fast Learn Adapts

• | Control Module References for TCM replacement, setup, and programming