P2546 - Torque Management Request Input Signal 'A' Low

Repair Importance Level: 3/3

Repair Difficulty Level: 3/3

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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?

Possible symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P2546 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.

OBDII Code P2546 - Torque Management Request Input Signal 'A' Low - AutoCodes.com

P2546 Information for specific makes

P2546 BUICK Torque Management Request Input Signal 'A' Low

P2546 CADILLAC Torque Management Request Input Signal 'A' Low

P2546 CHEVROLET Torque Management Request Input Signal 'A' Low

P2546 DODGE Torque Management Request Input Signal 'A' Low

P2546 FORD Torque Management Request Input Signal 'A' Low

P2546 GMC Torque Management Request Input Signal 'A' Low

P2546 LINCOLN Torque Management Request Input Signal 'A' Low

P2546 MERCURY Torque Management Request Input Signal 'A' Low

P2546 PONTIAC Torque Management Request Input Signal 'A' Low

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