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
- Actuator High Control Circuit Group 1 Low Voltage

DTC P0659
- Actuator High Control Circuit Group 1 High Voltage

Circuit/System Description

The transmission control module (TCM) high side driver 1 is located inside of the control solenoid valve assembly, which has no serviceable components. The high side driver 1 provides power to the 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
* High side driver 1 is enabled.
* DTC P0658 is not set.

P0659

DTC P0659 is not set.

Conditions for Setting the DTC

P0658

The TCM detects an internal open or short to ground in the high side driver 1 circuit for 1 second.

P0659

During TCM power-up and prior to the high side driver being enabled, the TCM detects an internal short to voltage on the high side driver 1 circuit a total of 3 times out of 5 consecutive readings.

Action Taken When the DTC Sets

P0658
* DTC P0658 is a Type A DTC.
* The TCM turns the high side driver OFF.
* The TCM turns OFF all solenoids.
* The TCM commands maximum line pressure.
* The TCM freezes transmission adaptive functions.
* The TCM commands the torque converter clutch (TCC) OFF.
* The TCM inhibits Tap Up/Down function.
* The TCM inhibits manual shifting of forward gears.
* The TCM limits the transmission to Reverse and 5th gear operation.

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
Connector End View Reference

* Component Connector End Views Connector End Views By Name
* Inline Harness Connector End Views Connector End Views By Number

Description and Operation

Transmission General Description Transmission General Description
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

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

Control Module References Control Module References for scan tool information
Special Tools

DT-47825-20 - Adapter Harness

For equivalent regional tools, refer to Special Tools 6T70/6T75 - Automatic Transmission.

Circuit/System Verification

1. Ignition ON, verify with a scan tool the High Side Driver 1 parameter displays Enabled.
2. Engine Running, gear selector lever in Park position. Verify with a scan tool the following test status parameters displays OK:

* High Side Driver 1 Circuit Low Voltage Test Status
* High Side Driver 1 Circuit Open Test Status
* High Side Driver 1 Circuit High Voltage Test Status

3. After performing the above steps, verify that the DTC does not reset by operating the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions you observe from the Freeze Frame/Failure Records data. If the vehicle passes the Circuit/System Verification procedure, then STOP. Do not perform the Circuit/System Testing or Component Testing as this may result in an unnecessary part replacement. Refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.

Circuit/System Testing

Note: You must perform the Circuit/System Verification first.

1. Ignition OFF, remove the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement 6T70/6T75 - Automatic Transmission.
2. Perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.
3. Place the Q8 control solenoid valve assembly on a clean work surface near the transmission assembly.
4. Connect the DT-47825-20 - adapter harness between the vehicle wire harness X1 20-way transmission electrical connector, and the Q8 control solenoid valve assembly electrical connector.
5. Ignition ON, verify with a scan tool the following test status parameters display OK:

* High Side Driver 1 Circuit Low Voltage Test Status
* High Side Driver 1 Circuit Open Test Status
* High Side Driver 1 Circuit High Voltage Test Status

• If any test status parameter displays Fault or Malfunction, replace the Q8 control solenoid valve assembly.

Repair Instructions

Note:
* Perform the Reset Transmission 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 Control Module References for control solenoid valve assembly replacement, setup, and programming