6T30/6T40/6T45/6T50 - 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 the control solenoid valve assembly which has no serviceable components. The high side driver 1 provides power to the TCM pressure control solenoids and shift solenoids.

Conditions for Running the DTC

P0658

* DTC P0658 is not set.

* High side driver 1 is enabled.

P0659

* DTC P0659 is not set.

* Ignition transitions from OFF to ON.

Conditions for Setting the DTC

P0658

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

P0659

TCM detects an internal short to voltage on the high side driver 1 circuit for 1 second.

Action Taken When the DTC Sets

P0658

* DTC P0658 is a Type A DTC.

* TCM turns the high side driver OFF.

* TCM commands all solenoids OFF.

* TCM commands the TCC OFF.

* TCM commands maximum line pressure.

* TCM freezes transmission adaptive functions.

* TCM inhibits neutral idle.

* TCM inhibits the Tap Up/Tap Down function.

* TCM inhibits manual shifting of forward gears.

* TCM defaults the transmission to 4th gear and reverse.

* TCM enables torque management.

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.

Diagnostic Aids

When DTC P0658 sets, the line pressure control solenoid, and pressure control solenoids 3 and 5, will default to maximum pressure. This results in maximum line pressure to the 1-2-3-4 clutch and the 4-5-6 clutch, when forward is selected.

Reference Information

Schematic Reference

Automatic Transmission Controls Schematics 6T30/6T40/6T45/6T50 - Automatic Transmission

Connector End View Reference

* Component Connector End Views Sunshade - Left Front

* Inline Harness Connector End Views X110

Description and Operation

* Transmission General Description Transmission General Description

* Transmission Component and System Description Transmission Component and System Description

* Electronic Component Description Electronic Component Description

* Drive Range - Fourth Gear Default (Gen 2/Hybrid) Drive Range - Fourth Gear Default (Gen 2/Hybrid)

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-48616-10 - Adapter Harness

For equivalent regional tools, refer to Special Tools 6T30/6T40/6T45/6T50 - Automatic Transmission.

Circuit/System Verification

1. Ignition ON.

2. Verify the scan tool High Side Driver 1 parameter displays ON.

• If ON is not displayed
Refer to Circuit/System Testing.

• If ON is displayed

3. Engine Running and the gear selector lever in the Park position.

4. Verify the scan tool parameters listed below do not display Malfunction:

* 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 Malfunction is displayed
Refer to Circuit/System Testing.

• If Malfunction is not displayed

5. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

6. Verify the DTC does not set.

• If a DTC sets
Refer to Circuit/System Testing.

• If a DTC does not set

7. All OK

Circuit/System Testing

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

1. Ignition OFF, remove the Q8 Control Solenoid Valve Assembly.

2. Verify the Q8 Control Solenoid Valve Assembly is not contaminated with any debris. Refer to Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.

• If contamination is present
Clean as necessary.

• If contamination is not present

3. Verify the resistance is within the specified range for each solenoid listed in the Control Solenoid Valve and Transmission Control Module Assembly Inspection Control Solenoid Valve and Transmission Control Module Assembly Inspection.

• If the resistance is not within range
Replace the Q8 Control Solenoid Valve Assembly.

• If the resistance is within range

4. Place the Q8 Control Solenoid Valve Assembly on a clean work surface near the transmission assembly.

5. Connect the DT-48616-10 - adapter harness between the vehicle wire harness electrical connector, and the Q8 Control Solenoid Valve Assembly electrical connector. Ignition ON.

6. Verify the scan tool parameters listed below do not display Malfunction:

* 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 Malfunction is displayed
Replace the Q8 Control Solenoid Valve Assembly.

• If Malfunction is not displayed

7. All OK

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Control Solenoid Valve and Transmission Control Module Assembly Replacement 6T30/6T40/6T45/6T50 - Automatic Transmission

* Perform the Transmission Adaptive Values Learn 6T30/6T40/6T45/6T50 - Automatic Transmission following all transmission related repairs.

* Refer to Control Module References Control Module References for control solenoid valve assembly replacement, programming and setup.