P012CTurbocharger/Supercharger Inlet Pressure Sensor A Circuit Low
- 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. P012C means the signal voltage is below its lower limit – typically a signal wire shorted to ground, an open signal or 5 V reference wire, or a failed sensor. GM's supercharged V8 sets it below 3 % of the 5 V reference (about 0.15 V), with 320 of 400 samples failing, continuously monitored; two trips are normal, one in some 2019 applications. FCA documented false settings on the 2019 Jeep Wrangler 2.0 turbo that were cured by a software update. A substitute value is used and power may be limited.
- What you may notice
- Check engine light on
- Often no noticeable symptoms
- Power limitation possible
- Likely causes
- LikelyConnector unplugged or corroded, signal or reference wire open
- PossibleSignal wire shorted to ground
- PossibleSensor failed internally
- RareControl module software (false setting)
- Rare5 V reference shorted by another sensor
- 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.