P25D9Fuel Level Sensor C Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P25D9 reports that the signal of the third fuel level sender has dropped below its lowest valid value. With the usual resistor-type sender this points to very low resistance, typically a signal wire shorted to ground or a sender shorted internally. Whether low means empty or full depends on how the sender is wired, so the gauge may stick at either end. No manufacturer documents P25D9 publicly. For sender A, Ford uses a fixed limit as reference: below 5 ohms, which equals less than one A/D count, the low code is set after 30 s (P0462). CARB requires out-of-range checks on all fuel level inputs. Distinct from P25DA, the high fault, and from P25D7, which only states a general circuit problem. Expect a gauge pinned at one end and a stored lamp code.
- What you may notice
- Gauge pinned at full or empty
- Check engine lamp on
- Likely causes
- LikelySignal wire of sender C chafed and shorted to ground
- PossibleInternal short in sender C
- RareWater in the tank connector bridging signal and ground
- 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: €50 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.