What are the common causes of P2639?

Torque management feedback A wire shorted to ground. Failed torque feedback A sensor. Corroded feedback A connector. Open in the feedback A return. ECM fault on the feedback A input.

Read torque management feedback A live data. Test the feedback A signal wire for a short to ground. Inspect the feedback A connector. Check the sensor supply and ground. Verify the feedback A signal at the ECM. Clear the code and retest.

P2639

Torque Management Feedback Signal A Low

System: Computer output circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P2639 means Torque Management Feedback Signal A Low.

Check these first

Torque management feedback A wire shorted to ground
Failed torque feedback A sensor
Corroded feedback A connector
Open in the feedback A return
ECM fault on the feedback A input

What to do next

Read torque management feedback A live data
Test the feedback A signal wire for a short to ground
Inspect the feedback A connector
Check the sensor supply and ground
Verify the feedback A signal at the ECM
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.