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 P0658: Pressure Control (PC)/Shift Lock Solenoid Control Circuit Low Voltage
DTC P0659: Pressure Control (PC)/Shift Lock Solenoid Control Circuit High Voltage

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage
--- | --- | --- | ---
High Side Driver 1 | P0658 | P0658 | P0659

### Circuit/System Description

The transmission control module (TCM) high side driver 1 is located inside the control solenoid (w/body and TCM) valve assembly. The control solenoid (w/body and TCM) valve assembly has no serviceable parts. The high side driver 1 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

#### P0658

• | The engine speed is greater than 500 RPM for 5 seconds.

• | Ignition voltage is between 9.0 volts and 19.0 volts.

• | High side driver 1 is enabled.

• | DTC P0658 has not failed this ignition cycle.

#### P0659

DTC P0659 has not failed this ignition cycle.

### Conditions for Setting the DTC

#### P0658

The TCM detects an internal open or short to ground in the high side driver 1 for 0.3 seconds or greater.

#### P0659

The TCM detects an internal short to voltage on the high side driver 1 circuit for 0.3 seconds or greater.

### Action Taken When the DTC Sets

#### P0658

• | DTC P0658 is a Type A DTC.

• | The TCM turns OFF all high side drivers.

• | The TCM turns OFF all solenoids.

• | The TCM commands the TCC OFF.

• | The TCM commands maximum line pressure.

• | the TCM freezes transmission adaptive functions.

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

#### P0659

DTC P0659 is a Type C DTC.

### Conditions for Clearing the DTC

• | DTC P0658 is a Type A DTC.

• | DTC P0659 is a Type C DTC.

### Reference Information

#### Schematic Reference

Automatic Transmission Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

• | Transmission General Description

• | Transmission Component and System Description

• | Electronic Component Description

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

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.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | 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.