P2546 - Torque Management Request Input Signal 'A' Low
P2546 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
First diagnose P2546 code
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Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded terminals.
Cost of diagnosing the P2546 code
Labor: 1.0
The cost of diagnosing the P2546 code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.P2546 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.
P2546 More Information
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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
Related Information
P2546 Comments
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