P071D
DTC P071D
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
DTC Descriptor
DTC P071D
- Trans Mode Switch B circuit
Diagnostic Fault Information
Circuit/System Description
The sport and economy shift modes allow driver selection of 2 different shift patterns. Sport mode programming in the transmission control module (TCM) increases transmission line pressure and extends shift points for performance enhanced driving. In the economy mode, the TCM uses standard programming, permitting normal line pressure and shifting. The sport mode switch is a console mounted momentary contact switch located on or near the electronic PRNDL assembly. Accessory voltage is supplied to the electronic PRNDL assembly through the ELEC PRNDL fuse. When the sport mode switch is depressed, it momentarily contacts the switch signal circuit. The rear integration module (RIM) recognizes the voltage on the circuit and sends a class 2 serial data message to the dash integration module (DIM). The DIM sends a class 2 message to the engine control module (ECM). The ECM sends a request to the transmission control module (TCM) through the controller area network (CAN) to enable the sport mode program.
The TCM evaluates the request, and if operating conditions are correct for enabling the program, the TCM sends a confirmation message to the ECM. The ECM then requests the instrument panel cluster (IPC) to illuminate the sport mode indicator.
The sport mode feature remains enabled until the sport mode switch is pressed again. Once disabled, the TCM will return to the economy mode programming.
Conditions for Running the DTC
* The engine speed is greater than 500 RPM for 5 seconds.
* Ignition voltage is between 9.0 volts and 19.0 volts.
Conditions for Setting the DTC
The TCM detects that the Sport Mode Switch has been continuously activated for 10 minutes.
Action Taken When the DTC Sets
* DTC P071D is a Type C DTC.
* The TCM freezes transmission adaptive functions.
Conditions for Clearing the DTC
DTC P071D is a Type C DTC.
Diagnostic Aids
* DTC P071D detects a stuck sport pattern switch.
* Diagnose all communication and body DTCs first.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics (Electrical Diagrams)
Connector End View Reference
Component Connector End Views (Connector Views)
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 (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference
Control Module References (Programming and Relearning) for scan tool information
Circuit/System Verification
1. Ignition ON. While observing the sport mode indicator on the IPC, press the sport mode switch several times. Does the sport mode indicator illuminate On and Off with switch operation?
• Test the instrument panel cluster (IPC) for proper operation and lamp illumination. Refer to Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview).
• Test the rear integration module (RIM) for proper sport mode switch input and output operation. Refer to Control Module References (Programming and Relearning).
• If the DTC resets, go to Circuit/System Testing.
2. 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
Important: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Ignition ON, engine OFF. While observing the sport mode indicator on the IPC, press the sport mode switch several times. Is the sport mode indicator always ON?
• Test the accessory voltage circuit for an open.
• Test the sport mode switch signal circuit for an open.
• Test the electronic PRNDL ground circuits for on open.
• Replace the electronic PRNDL assembly.
2. While observing the sport mode indicator on the IPC, disconnect the electronic PRNDL assembly from the console wiring harness connector. Is the sport mode indicator still illuminated?
• Replace the electronic PRNDL assembly.
3. Test the sport mode switch signal circuit for a short to ground. If the circuit test good replace the sport mode switch.
Component Testing
1. Disconnect the electronic PRNDL assembly.
2. Connect a DMM, between the sport mode switch signal circuit and the ground circuit of the electronic PRNDL assembly.
3. Set the DMM to measure resistance. While observing the DMM, press the sport mode switch several times. Does the resistance toggle between very low resistance to very high resistance as the switch is pressed?
• Replace the electronic PRNDL assembly.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement (6T40/6T45 - Automatic Transmission)