P012ATurbocharger/Supercharger Inlet Pressure Sensor A Circuit
- 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 turbocharger/supercharger inlet pressure sensor A sits between the air filter and the compressor. The engine uses it for the compressor pressure ratio, to judge air filter restriction (ambient minus inlet pressure) and to cross-check the other pressure sensors. P012A is the general circuit fault. Ford's 2023 diesels use a digital SENT sensor here and set P012A when its error flag is raised or the value exceeds a limit for 5 s; lost communication is reported separately (U068B). FCA's 2019 Jeep Wrangler 2.0 turbo could set P012A, P012C and P012D falsely and was fixed with new engine software, so the software level is worth checking before replacing parts. GM's supercharged V8 uses only P012B–P012D. A substitute value, usually ambient pressure, is used.
- What you may notice
- Check engine light on
- Often no noticeable symptoms
- Power limitation possible
- Likely causes
- LikelyConnector or wiring open, corroded or shorted
- PossibleSensor faulty (SENT sensor reports internal error)
- PossibleControl module software (false setting)
- RareEngine control module faulty
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €20 – €250
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.