P2549: Torque Management Request Input Signal B Range/Performance
What to do
Same practical advice as the other codes in this family: the engine is unlikely to be the problem, and the power loss comes from a request made by another module. If both an A and a B code are stored, say so — that pattern usually means something shared, such as a connector or an earth point, rather than two independent faults.
What this code means
The second torque reduction request is electrically valid and does not agree with the conditions, or does not agree with the A signal.
Where the two lines carry the same request as a check on each other, a disagreement is the whole point of the design working. Neither reading is necessarily wrong, and the module cannot tell which one to trust — so it takes the safe interpretation and reduces torque. That is why a car can lose power on the strength of a code that describes only a disagreement.
The reasoning for a request made for a genuinely wrong reason, and the wheel speed sensor case that produces it, is at P2545.
Likely causes
Start here
- Damaged wiring harness · moderate
- Faulty wheel speed sensor · moderate
- Corroded or loose connector · easy
Less common
- Faulty stability control module · specialist
- Faulty transmission control module · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
Be the first to write this up
Nothing posted about this yet. Whatever you found is worth writing down — even a dead end saves someone the same afternoon.
What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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