P00C5Turbocharger/Supercharger B Turbine Overspeed
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- The control module has detected that turbocharger B runs above its permitted maximum speed. Speed is measured by a dedicated sensor per turbocharger where fitted, or estimated from a model of pressure ratio and air mass. Turbocharger B is the second turbocharger in series systems or the one on bank 2 in parallel systems. Typical causes are sticking boost control of this turbocharger or a charge-air leak; find the cause before driving on, as overspeed can destroy the turbocharger. No manufacturer description naming this exact code was found; the explanation follows its documented counterpart.
- What you may notice
- Check engine light on
- Limp mode with reduced power
- Whistling from the turbocharger
- Likely causes
- LikelyBoost control of turbocharger B sticking (wastegate or vanes)
- PossibleLeak on the pressure side making the turbocharger work harder
- PossibleSpeed sensor or its wiring delivering wrong values
- RareOperation at high altitude or software
- 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: €150 – €3,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.