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DTC P2544

DTC P2544

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P2544

Transmission Torque Request Circuit

DTC P2544

Transmission Torque Request Signal Message Counter Incorrect

Circuit/System Description

To improve shift feel, the transmission control module (TCM) is constantly sending the engine control module (ECM) serial data messages with information regarding it's request for modifying engine speed or torque. The serial data messages are sent via two circuits that are part of a communications network known as the controller area network (CAN). The ECM sets DTC P2544 if it detects a deviation in the message structure which implies that the message may be corrupted.

An intermittent fault in the CAN circuits will cause the ECM to set DTC P2544.

Conditions for Running the DTC


• The engine run time is greater than 0.5 s.

• No other CAN errors are present.


Conditions for Setting the DTC

The ECM detects that the engine speed and torque modification messages from the TCM are either corrupted or intermittently missing for greater than 4 s.

Action Taken When the DTC Sets


• DTC P2544 is a Type B DTC.

• The TCM commands maximum line pressure during shifts, which results in harsh shifts.

• The TCM freezes adaptive functions.


Conditions for Clearing the DTC

DTC P2544 is a Type B DTC.

Reference Information

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Circuit/System Verification


1. DTC P2544 is an informative error code. Diagnose all other DTCs from the ECM that were set before DTC P2544. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. If no other DTCs are stored in the ECM, the diagnosis is performed by testing the CAN for intermittent circuit malfunctions. Go to Scan Tool Not Communicating with High-Speed GMLAN Unit .


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for TCM replacement, setup, and programming.