6T70/6T75 - Automatic Transmission

DTC P0658 or P0659

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions 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

Circuit/System Description

The transmission control module (TCM) high side driver 1 is located inside of the control solenoid (w/body and TCM) valve assembly and is not serviced separately. 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 8.6-19.0 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 second or greater of a 0.5 second sample.

P0659

The TCM detects an internal short to voltage on the high side driver 1 circuit for 0.3 second or greater of a 0.5 second sample.

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 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.

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
Description and Operation

Transmission General Description Transmission General Description
DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Verification

1. Ignition ON, clear the DTCs with a scan tool.
2. Operate the vehicle within the Conditions for Running and Setting the DTC. The DTCs should not set.

• If a DTC sets, replace the control solenoid (w/body and TCM) valve assembly.

3. 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.

Repair Instructions

Note:
* Perform the Service Fast Learn Adapts 6T70/6T75 - Automatic Transmission following all transmission related repairs.
* 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 Verification Tests after completing the diagnostic procedure.

Control Module References Programming and Relearning for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming