P2637
Torque Management Feedback Signal A
The torque feedback signal A from the transmission or other torque user is missing or invalid. The engine controller cannot reduce torque on shift requests, which can cause harsh shifts.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Required CAN message not received in timeCommon
- Source module reports an internal faultPossible
Parts involved
- TCM
- Communication Bus
- Wiring Harness
P2637 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.