P25D7
Fuel Level Sensor C Circuit
A third fuel level sensor (C) used on multi-tank trucks, dual-saddle SUVs, or auxiliary fuel systems returns no usable signal. Without it, calculated fuel level and EVAP monitor enabling will be off.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Open sender resistor or broken floatCommon
- Corroded tank pump module connectorPossible
Parts involved
- Fuel Level Sensor C
- Fuel Tank
- Wiring Harness
P25D7 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.