P0297Vehicle Overspeed Condition
- Generic OBD-II code · Powertrain
- Can trigger limp mode
- How the car detects it
- P0297 is a condition code: the engine module detects that road speed – from the vehicle speed sensor or wheel and output shaft speed – exceeded the calibrated maximum. Electronic speed limiters cut fuel or throttle at that limit, and the event is stored. Ford uses the code on its petrol trucks and stores it without the warning light; no manufacturer publishes a threshold. Common triggers are descending with a trailer beyond the limiter speed, wheelspin on the driven axle, a wrongly programmed tyre size or axle ratio, or spikes in the speed signal. Unlike P0219 it concerns road speed, not engine speed.
- What you may notice
- Usually no warning light, code only stored
- Vehicle limits speed at its maximum
- With a disturbed signal: jumping speedometer, odd shifting
- Likely causes
- LikelyLimiter speed genuinely exceeded (downhill, trailer)
- PossibleWrong tyre size or axle ratio programmed, larger wheels fitted
- PossibleWheelspin on the driven axle
- RareSpeed signal disturbed (loose contact, interference, tone wheel)
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €150
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.