OBD-II code · Powertrain (generic)
P012C Turbocharger/Supercharger Inlet Pressure Sensor A Circuit Low
Turbo inlet pressure sensor A signal voltage below expected range. 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 P012C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelySignal wire shorted to ground
- Less likelyConnector pins corroded - high contact resistance
- Less likelyHarness chafing through insulation
Symptoms
- Check engine light on
- Significant power loss / limp mode
- Possible blue or black smoke from exhaust
- Whistling or hissing sound from intake
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- Parts involved
- Turbo Inlet Pressure Sensor A, Sensor Wiring
Related codes
- P0129Barometric Pressure Too Low
- P012ATurbocharger/Supercharger Inlet Pressure Sensor A Circuit
- P012BTurbocharger/Supercharger Inlet Pressure Sensor A Circuit Range/Performance
- P012DTurbocharger/Supercharger Inlet Pressure Sensor A Circuit High
- P012ETurbocharger/Supercharger Inlet Pressure Sensor A Circuit Intermittent/Erratic
- P012FEngine Coolant Temperature / Engine Oil Temperature Correlation
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.