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.

Symptoms

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

Most likely causes

• Loose or spread terminal in the sender C connector
• Wire breaking contact when the frame or tank moves
• Sender wiper lifting off a worn resistor track

What to check, in order

Start with the simplest. You can tick off each step.

1. Check the connector and wiring
2. Gently move the wiring with the engine running and watch whether the reading changes.
3. Use live data to compare the reading with actual conditions
4. Measure power, ground, and signal
5. Replace the sensor if the circuit is good

Good to know

• Repair difficulty: medium
• It affects emissions.

What each character of P25DB means

• P: Powertrain: engine and transmission
• 2: Generic code: same on every make
• 5: Speed and idle
• DB: Specific fault in that system

Frequently asked questions

Can I keep driving with code P25DB?

You can normally keep driving. If it affects the fuel level, do not trust the gauge and refuel earlier than usual.

What causes code P25DB?

The most common causes are: loose or spread terminal in the sender C connector; wire breaking contact when the frame or tank moves; sender wiper lifting off a worn resistor track.

Related codes

• P25D7Fuel Level Sensor C Circuit
• P25D9Fuel Level Sensor C Circuit Low
• P25DAFuel Level Sensor C Circuit High
• P0464Fuel Level Sensor A Circuit Intermittent
• P2069Fuel Level Sensor B Circuit Intermittent

Sources

• law.cornell.edu: 13 CCR 1968.2
• fordservicecontent.com: OBD Operations Summary Gasoline 2020 2023

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.