P00FBTurbocharger Outlet Pressure Sensor A Circuit High
- 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 outlet pressure sensor A measures the pressure directly after the compressor, usually ahead of the charge air cooler; FCA fits it as a combined temperature and pressure sensor. Boost control and compressor protection use the value. P00FB means the signal voltage is above its valid range: typically a signal wire shorted to the 5 V reference or battery voltage, an open ground, or a failed sensor. It does not mean the boost really is too high – that would be P0234. The circuit is monitored continuously from key-on; comparable GM pressure sensors fail above 86–97 % of the reference for about 4 s. The engine then works with a substitute value and may limit boost. GM and Ford do not use this code family in their published summaries – they rely on the boost sensor ahead of the throttle (P0235–P0238) – so no manufacturer document naming exactly this code was found.
- What you may notice
- Check engine light on
- Loss of power or limp mode with boost limit
- Further pressure plausibility codes possible
- Likely causes
- LikelySignal wire shorted to 5 V reference or battery voltage
- PossibleGround (low reference) wire open or connector corroded
- PossibleSensor faulty internally (oil mist, heat at compressor outlet)
- 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.