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DTC P1761

A 12 volt ignition power circuit is provided by the body control module (BCM) to the Tap Up/Down circuit. When a Tap Up/Down request is made by pressing a plus (+) or minus (-) button or moving the gear lever, a corresponding voltage drop occurs across the resistor network embedded in the switches. This voltage drop is monitored by the BCM through the signal circuit. The BCM sends the request to the transmission control module (TCM) to perform an upshift or downshift. The TCM is constantly monitoring the serial data sent from the BCM for the correct number and sequence of counts for Tap Up and Tap Down function.

The engine speed is greater than 400 RPM for 5 seconds.

The TCM detects the serial data rolling count value for the Tap Up/Tap Down does not match with the expected BCM count, 3 or greater times in 10 seconds.

DTC P1761 is a Type C DTC.

Description and Operation

Electronic Component Description for control solenoid valve assembly information.

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. DTC P1761 is an informational DTC. Diagnose all other BCM DTCs prior to DTC P1761. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
2. If there are no other body control DTCs, diagnosis is accomplished by looking for an intermittent CAN circuit fault. Refer to Scan Tool Does Not Communicate with High Speed GMLAN Device .
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.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.