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.

The TCM detects that the Sport Mode Switch has been continuously activated for 10 minutes.

DTC P071D is a Type C DTC.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

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.

⇒	Test the rear integration module (RIM) for proper sport mode switch input and output operation. Refer to Control Module References.

⇒	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.

Note: 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.

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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement