P2546
Torque Management Request Input Signal A Low
Torque management input A reads stuck low — analog short to ground or message stuck at minimum value. The ECM cannot trust the request and falls back to a safe default.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to groundCommon
- CAN message stuck at minimum valuePossible
Parts involved
- Torque Management Input A
P2546 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.