OBD-II code · Powertrain (generic)
P00C3 Turbocharger/Supercharger Bypass Valve B Control Circuit Range/Performance
Bypass valve B does not respond to commands as expected. Mechanical issue. Boost control tracks commanded vs. actual manifold pressure; persistent deviation means wastegate, vanes, hose or actuator are not delivering the requested pressure.
Is it safe to drive with P00C3?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyValve sticking from carbon
- Less likelySensor element aged beyond calibration window
- Less likelySensor mounting loose - signal damping
Symptoms
- Charge status indicator shows fault
- Charging may not start or interrupts
- Slower-than-expected charge rate
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Bypass Valve B
Related codes
- P0039Turbocharger/Supercharger Bypass Valve A Control Circuit Range/Performance
- P25FBTurbocharger/Supercharger Bypass Valve C Control Circuit Range/Performance
- P00C0Turbocharger/Supercharger Bypass Valve B Control Circuit
- P00C1Turbocharger/Supercharger Bypass Valve B Control Circuit Low
- P00C2Turbocharger/Supercharger Bypass Valve B Control Circuit High
- P00C4Turbocharger/Supercharger Bypass Valve B - Mechanical
- P00C5Turbocharger/Supercharger B Turbine Overspeed
- P00C6Fuel Rail Pressure Too Low - Engine Cranking Bank 1
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.