P012ETurbocharger/Supercharger Inlet Pressure Sensor A Circuit Intermittent/Erratic
- 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 ahead of the compressor – between air filter and turbocharger, or on GM's supercharged V8 between throttle and supercharger. It is an analogue 5 V pressure sensor used for the compressor pressure ratio, filter restriction and cross-checks with the other pressure sensors. P012E covers a signal that jumps or drops out briefly without staying below or above the circuit limits – typically a loose contact. Such intermittent monitors usually count short limit violations or changes faster than real pressure can move. No manufacturer document using exactly this code was found: GM handles jumps of this sensor through its range check P012B and the counting windows of P012C/P012D, and Ford's 2023 diesels report their digital sensor under P012A. The description therefore rests on CARB's circuit monitoring requirement and component information. A substitute value is used while the fault is present.
- What you may notice
- Check engine light on
- Occasional power reduction or boost fluctuation
- Often no noticeable symptoms
- Likely causes
- LikelyLoose contact or corrosion at the sensor connector
- PossibleBroken or chafed wire making intermittent contact
- PossibleSensor faulty internally (erratic output)
- RareControl module or software
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.