P2AAEDiesel Fuel Presence Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P2AAE is stored when the diesel presence sensor signal falls below the lowest value the input accepts, which points to a short to ground on the signal line or a sensor whose output has collapsed. Whether a low reading would otherwise stand for diesel or for gasoline is not published, so the code says nothing about the fuel in the tank, only that the reading cannot be used. No manufacturer documents P2AAE publicly. Ford's misfuelling patent US10611625B2 targets hybrids with sealed fuel tanks and watches the carbon canister temperature during refuelling, which shows that the task can be solved with sensors the vehicle already has. CARB requires out-of-range checks on inputs. Look first for chafed wiring near the tank, then at the sensor; P2AAF is the high counterpart.
- What you may notice
- Check engine light on
- Misfuelling protection inactive
- Likely causes
- LikelySignal wire shorted to ground, often chafed on the underbody
- PossibleInternal short in the sensor
- RareSensor supply or reference voltage missing
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.