C0405Traction Control Active Too Long
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- C0405 could not be found in any public source, including the public J2012 tables, GM's PIP5094 and NHTSA's bulletin index, and no maker publishes a time limit for a traction control intervention. So only the monitored function is outlined. Traction control brakes a spinning drive wheel and asks the engine for less torque; Bosch counts it among the functions of ESP. In the 2004 Saab 9-5 the return pump runs throughout every TCS or ESP braking event while the control valves raise, hold and lower pressure, and the function lamp lights only when braking and torque reduction act together. An intervention lasting far longer than expected suggests a false wheel speed or a stuck valve; how and when a system then reacts is maker specific.
- What you may notice
- Traction control lamp flashes for a long time or stays on
- Engine power reduced and a wheel braked without reason
- Hot or smelling brake on one wheel
- Likely causes
- LikelyErratic wheel speed signal faking continuous wheel spin
- PossibleSpare wheel or tires of different size on one axle
- RareHydraulic control valve sticking in the brake unit
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.