P2637 moderate

Torque Management Feedback Signal A

The P2637 code means the vehicle's onboard diagnostic system has detected: Torque Management Feedback Signal A. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $100 - $800 (parts and labor)

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Common Symptoms

Inconsistent torque delivery
Traction control engaging unexpectedly
Transmission shift quality issues
Check engine light on

Probable Causes (Ranked by Likelihood)

ECM torque output signal circuit fault Very High
Communication error between ECM and TCM High
CAN bus wiring issue affecting torque signal Moderate
TCM not properly reading torque signal Low

Step-by-Step Diagnostic Procedure

Monitor torque management signals on scan tool
Check CAN bus communication between ECM and TCM
Inspect CAN bus wiring for damage
Verify ECM and TCM software versions are compatible

Frequently Asked Questions

What is torque management feedback?

The ECM communicates actual engine torque output to the TCM so it can coordinate shifts. P2637 indicates this feedback signal is not being properly received.

Why does my transmission shift poorly with P2637?

Without accurate torque data, the TCM cannot properly coordinate torque reduction during shifts, leading to harsh or poorly timed shifts.

Can a CAN bus issue cause P2637?

Yes. The torque signal is typically transmitted over the CAN bus network. Wiring damage, termination issues, or interference can disrupt this communication.