DTC P2544 5.3L and 6.0L

The controller area network (CAN) serial data bus is used by the engine control module (ECM) and automatic transmission control module (TCM) to share information. This diagnostic applies to CAN signal failures.

P2544

The ECM notifies the TCM that a torque reduction request has failed for 2 seconds.

P2544

DTC P2544 is a Type B DTC.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Transmission General Information

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Transmission Control Module Scan Tool Information

1. Start the engine; observe the DTC information with a scan tool. CAN DTCs should not set.
2. Operate the vehicle within the conditions for running the DTC. CAN DTCs should not set.

1. Ignition ON, attempt to establish communication with the ECM with a scan tool.

⇒	If no communication with the ECM, refer to Control Module References for further diagnosis.

2. Ignition OFF, disconnect the harness connector of the ECM.
3. Ignition ON, verify that 1.5-3.4 volts is available between the CAN serial data low and the CAN serial data high circuits.

⇒	If the voltage is not within the specified range, replace the ECM.

4. Ignition OFF, test the CAN communication circuits between the ECM and the TCM for an open, short to ground, or a short to voltage.
5. If the circuits/connections test OK, replace the TCM.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for TCM replacement, setup, and programming