P080D
DTC P080C or P080D
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 Descriptor
DTC P080C
- Skip Shift Solenoid Control Circuit Low Voltage
DTC P080D
- Skip Shift Solenoid Control Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
Ignition voltage is supplied directly to the skip shift solenoid. The engine control module (ECM) controls the skip shift solenoid by grounding the control circuit via an internal switch called a low side driver. The low side driver has a fault line which monitors the control circuit. When the ECM commands the skip shift solenoid ON, the voltage on the control circuit should be low, near 0 V. When the ECM commands the control circuit to the skip shift solenoid OFF, the voltage should be high, near battery voltage.
Conditions for Running the DTC
The engine is running.
Conditions for Setting the DTC
* The ECM detects that the commanded state of the driver and the actual state of the control circuit does not match.
* The condition exists for 5 seconds.
Action Taken When the DTC Sets
P080C or P080D are Type B DTCs.
Conditions for Clearing the MIL/DTC
P080C or P080D are Type B DTCs.
Diagnostic Aids
The battery must be fully charged and pass a battery test. Refer to Battery Inspection/Test Battery Inspection/Test.
Reference Information
Schematic Reference
Manual Transmission Schematics Tremec 6-Speed - Manual Transmission
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Manual Transmission Description and Operation Manual Transmission Description and Operation
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
Engine Control Module Scan Tool Information (LFX) Scan Tool Testing and ProceduresEngine Control Module Scan Tool Information (LS3/L99) Scan Tool Testing and ProceduresEngine Control Module Scan Tool Information (LSA) Scan Tool Testing and Procedures
Circuit/System Verification
1. Ignition ON, command the skip shift solenoid ON and OFF, with a scan tool, while observing the following skip shift circuit status parameters.
* Skip shift solenoid control Ckt. Short Gnd Test Status
* Skip shift solenoid control Ckt. Open Test Status
* Skip shift solenoid control Ckt. Short Volts Test Status
• Each parameter should toggle between OK and Not Run or Not Run and OK.
2. 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. Disconnect the skip shift solenoid harness connector.
2. Ignition ON, verify that a test lamp illuminates between the voltage circuit terminal B and ground.
• If the test lamp does not illuminate, test the voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the circuit fuse is open, replace the skip shift solenoid.
3. Verify that a test lamp does not illuminate between the voltage circuit terminal B and the control circuit terminal A.
• If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
4. Remove the test lamp.
5. Command the skip shift solenoid ON with a scan tool. Verify with a scan tool that the skip shift solenoid Ckt. Short Volts Test Status parameter is OK.
• If not the specified value, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
6. Install a 3 A fused jumper wire between the skip shift control circuit terminal A and the voltage circuit terminal B. Command the skip shift solenoid ON with a scan tool. Verify with a scan tool that the affected skip shift solenoid Ckt. Short Volts Test Status parameter is displaying Fault.
• If not the specified value, test the control circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
7. If all the circuits test normal, replace the skip shift assembly.
Repair Instructions
* Gear Select/Skip Shift Solenoid Replacement Gear Select/Skip Shift Solenoid Replacement
* Engine Control Module Programming and Setup (LFX) Testing and InspectionEngine Control Module Programming and Setup (LSA, LS3, L99) Testing and Inspection
* Engine Control Module Replacement Service and Repair
Repair Verification
1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Turn OFF the ignition for 60 seconds.
5. Engine running, command skip shift solenoid ON and OFF with a scan tool, while observing the skip shift circuit status parameters. The circuit status parameters should change from OK to Not Run or Not Run to OK.
• If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.