P25DA: Fuel Level Sensor C Circuit High

P25DA is set when the third sender's signal climbs above the top of its valid range. On a resistor sender fed through a pull-up, that almost always means an open path: a broken wire, a disconnected plug, a burnt-out spot on the resistor track or a missing ground return. A short to a voltage source has the same effect. No manufacturer documents P25DA publicly. The sender A counterpart gives an idea of the limits used: Ford flags the high fault when resistance exceeds 200 ohms, corresponding to more than 253 A/D counts, for 30 s (P0463). CARB requires out-of-range monitoring for fuel level inputs. Unlike P25D9, the cause here is usually an interruption rather than a short, so connectors and the harness at the tank deserve the first look. The gauge will usually rest at one end.

Symptoms

• Gauge stuck at one end of the scale
• Check engine lamp on

Most likely causes

• Broken signal or ground wire to sender C
• Tank connector loose or unplugged after work on the tank
• Interrupted resistor track inside sender C
• Signal wire shorted to a voltage supply

What to check, in order

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

1. Check the connector and wiring
2. Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
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 P25DA means

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

Frequently asked questions

Can I keep driving with code P25DA?

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

What causes code P25DA?

The most common causes are: broken signal or ground wire to sender C; tank connector loose or unplugged after work on the tank; interrupted resistor track inside sender C.

Related codes

• P25D7Fuel Level Sensor C Circuit
• P25D9Fuel Level Sensor C Circuit Low
• P25DBFuel Level Sensor C Circuit Intermittent
• P0463Fuel Level Sensor A Circuit High
• P2068Fuel Level Sensor B Circuit High

Sources

• law.cornell.edu: 13 CCR 1968.2
• fordservicecontent.com: OBDSM2400OUTPUT 16Jul2024 WSM final V2 MCS7001

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.