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P2544 - Torque Management Request Input Signal 'A'

Possible causes
- Faulty Engine Control Module (ECM)
- Faulty Transmission Control Module (TCM)
- Engine Control Module (ECM) software update
- Transmission Control Module (TCM) software update
- Engine Control Module (ECM) harness is open or shorted
- Engine Control Module (ECM) circuit poor electrical connection
What does this mean? What does this mean?
Possible symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P2544 Description

To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding the base ignition timing and notifying the TCM that the request has succeeded. If the ECM is unable to comply with the request, the ECM sends the TCM a message that the request has failed.

The torque reduction request is sent to the ECM through a communication network called the controller area network (CAN). Two circuits are used to communicate CAN data between the ECM and TCM.

A fault in the CAN will not cause the ECM to set the Diagnostic Trouble Codes (DTC). If a CAN fault occurs, other DTCs will set before this code.

The ECM set the OBDII code when the TCM receives a torque reduction failure message from the ECM.

P2544 Information for specific makes
P2544 BUICK Torque Management Request Input Signal 'A'
P2544 CADILLAC Torque Management Request Input Signal 'A'
P2544 CHEVROLET Torque Management Request Input Signal 'A'
P2544 DODGE Torque Management Request Input Signal 'A'
P2544 FORD Torque Management Request Input Signal 'A'
P2544 GMC Torque Management Request Input Signal 'A'
P2544 LINCOLN Torque Management Request Input Signal 'A'
P2544 MERCURY Torque Management Request Input Signal 'A'
P2544 PONTIAC Torque Management Request Input Signal 'A'
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