6T30/6T40/6T45 - 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
- Solenoid High Control Circuit Group 1 Low Voltage
DTC P0659
- Solenoid High Control Circuit Group 1 High Voltage
Diagnostic Fault Information
Circuit/System Description
The transmission control module (TCM) high side driver 1 is located inside the control solenoid (w/body and TCM) valve assembly which has no serviceable parts. The high side driver 1 provides power to 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 18.0 volts.
* High side driver 1 is enabled.
* DTC P0658 has not failed this ignition cycle.
P0659
* DTC P0659 has not set this ignition cycle.
* Ignition voltage is between 9.0 volts and 18.0 volts.
* Ignition transitions from OFF to ON.
Conditions for Setting the DTC
P0658
The TCM detects an internal open or short to ground in the high side driver 1 for 1 second.
P0659
The 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.
* 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.
* The TCM inhibits the Tap Up/Tap Down function.
* The TCM inhibits manual shifting of forward gears.
* The TCM defaults the transmission to 4th gear and reverse.
* The 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 2 and 3, will default to maximum pressure. This results in maximum line pressure to the 3-5 reverse clutch, low/reverse clutch, when reverse is selected, and the 4-5-6 clutch, when forward is selected.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics 6T30/6T40/6T45 - Automatic Transmission
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
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component 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 Programming and Relearning for scan tool information
Special Tools
DT-48616-10 - Jumper Harness
For equivalent regional tools, refer to Special Tools 6T30/6T40/6T45 - Automatic Transmission.
Circuit/System Verification
1. Ignition ON, verify with a scan tool the high side driver 1 parameter displays ON.
2. Engine Running, gear selector lever in Park position. Verify with a scan tool the following test status parameters displays OK.
* High Side Drvr 1 Ckt Short Volts Test Status
* High Side Drvr 1 Ckt Open Test Status
* High Side Drvr 1 Ckt Short Gnd Test Status
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.
Circuit/System Testing
Note: You must perform the Circuit/System Verification first.
1. Ignition OFF, remove the control solenoid (w/body and TCM) assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement 6T30/6T40/6T45 - 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 control solenoid (w/body and TCM) valve assembly on a clean work surface near the transmission assembly.
4. Connect DT-48616-10 - harness between the vehicle wire harness electrical connector, and the control solenoid (w/body and TCM) valve assembly electrical connector.
5. Ignition ON, verify with a scan tool the following test status parameters displays, OK.
* High Side Drvr 1 Ckt Short Volts Test Status
* High Side Drvr 1 Ckt Open Test Status
* High Side Drvr 1 Ckt Short Gnd Test Status
• If any test status parameter displays Fault or Malfunction, replace the control solenoid (w/body and TCM) valve assembly.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Refer to Control Module References Programming and Relearning for control solenoid (w/body and TCM) valve assembly replacement, setup, and programming.
* Perform the Service Fast Learn Adapts 6T30/6T40/6T45 - Automatic Transmission following all transmission related repairs.