What Does P2544 Mean?
The PCM is not receiving the expected torque reduction request signal from another control module. This code indicates a communication or signal issue with torque management system input circuit A.
Common Causes
35%
Communication fault between TCM and PCM on CAN bus or dedicated circuit
25%
Failed transmission control module unable to send torque request signals
20%
Wiring harness damage between control modules
12%
PCM software issue or calibration mismatch between modules
8%
Failed PCM unable to properly receive torque management signals
Diagnostic Steps
1
Step 1: Check for communication DTCs in all modules, particularly TCM and PCM
2
Step 2: Monitor CAN bus communication with scan tool to verify data transmission between modules
3
Step 3: Check torque management PID values during operation to see if signal is present
4
Step 4: Inspect control module connectors and CAN bus wiring for damage or corrosion
5
Step 5: Verify all control modules have current software calibrations; reflash if updates available
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The PCM is not receiving the expected torque reduction request signal from another control module. This code indicates a communication or signal issue with torque management system input circuit A.
The most common cause of P2544 (Torque Management Request Input Signal "A") is: Communication fault between TCM and PCM on CAN bus or dedicated circuit
Typical repair costs for P2544 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause harsh or delayed shifts due to improper torque reduction during gear changes. Generally safe to drive but transmission longevity may be affected.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2544 to identify the root cause.
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Quick Info
Category
Powertrain
System
Powertrain Communication/Transmission Control
Difficulty
Type
Generic (SAE)
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