P25DB Fuel Level Sensor C Circuit Intermittent

P25DB describes short, repeated dropouts in the third fuel level input: the signal leaves its valid range for moments and returns, rather than staying low or high. Typical culprits are a loose pin, a wire that breaks contact only when the vehicle flexes or the tank moves, and a sender whose wiper briefly lifts off the resistor track over rough roads. No manufacturer documents P25DB publicly. Ford does not use a separate intermittent code for senders A and B; it catches short-term jumps through its noisy-signal check (more than 100 jumps of over 40 % at 0.1 s sampling) under the performance codes, which is the closest documented logic. Under CARB this input falls under mandatory supervision as well. The gauge may flicker or briefly fall to empty, and the fault can be hard to reproduce in the workshop.

Likely causes

Symptoms

• Fuel gauge flickers or drops briefly to empty
• Check engine lamp may come and go

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, fordservicecontent.com.