P2549Torque Management Request Input Signal B Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2549 covers a torque request on channel B that arrives readable but makes no sense: a requested torque outside the expected band, a request that contradicts the current driving state, or one that changes in a way the sender could not plausibly mean. The wiring or bus link is assumed intact here, which separates it from the general fault P2548. No maker documents P2549 publicly. In GM's 2017 engine tables channel B carries the intervention wish of the brake/traction module, which GM validates under P2548 only. CARB obliges makers to check input components for rational values when they matter for emissions or for other monitors. The equivalent code on channel A is P2545; P2550 and P2551 are the low and high faults on B. Traction control may act less smoothly.
- What you may notice
- Check engine light depending on make
- Traction control intervenes abruptly or not at all
- Likely causes
- LikelyRequesting module (e.g. brake/traction module) computes implausible values
- PossibleSoftware levels of sender and engine module do not match
- RareFaulty input data at the requesting module, such as wheel speed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.