P025ETurbocharger/Supercharger Boost Sensor A Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Boost sensor A measures the pressure between charge air cooler and throttle (Ford TIP, GM TIAP). P025E counts brief excursions outside its valid voltage range that are each too short for the low or high code P0237/P0238 – Ford's limits are below 0.19 V and above 4.88 V. Ford counts these events continuously and sets P025E after 10 in one drive cycle. Boost control then runs on a substitute value or is switched off, leaving only base boost. Typical causes are a loose or corroded connector or a wire breaking under vibration and heat.
- What you may notice
- Check engine light on
- Occasional loss of power, boost limited
- Jerking on acceleration
- Likely causes
- LikelyLoose contact or corrosion at the sensor connector
- PossibleWire or 5 V reference breaking from vibration or heat
- PossibleSensor faulty internally (erratic signal)
- RareShared 5 V reference disturbed 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: €30 – €200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.