What it means
The code indicates a fault in the Fuel Level Sensor C circuit. It does not establish that the vehicle has a third sender, that it uses a particular tank layout, or that EVAP monitor enablement is affected.
At a glance
- Usually lights the check-engine light
How it works
Fuel Level Sensor C is one of the fuel-level sensing inputs used by the vehicle's control system; its physical location and role vary by vehicle. P25D7 indicates a fault in that sensor's electrical circuit, without establishing how many senders the tank has or which sender design is used.
Common causes
Most likely first.
- Open sender resistor or broken float
- Corroded tank pump module connector
Symptoms
- Fuel gauge may read inaccurately
- Fuel level warning may appear at the wrong time
How to diagnose it
- Save freeze-frame data and check for other fuel-level sensor codes before clearing the fault.
- Compare the scan-tool reading for Fuel Level Sensor C with the dashboard gauge and the known fuel level.
- Inspect accessible wiring and the tank pump-module connector for loose connections, corrosion, or damage.
- Following the manufacturer's procedure, check the sender circuit for an open and test the sensor's resistance or signal across its range.
- If the sender circuit and connector pass, trace the wiring to the control module and check the input using the manufacturer's procedure.
Common fixes
- Reconnect or repair a loose or damaged tank-module connector.
- Repair broken wiring in the Fuel Level Sensor C circuit.
- Replace the sender if its resistance or signal test confirms an internal open.
- Replace or repair the pump-module connector if its terminals are corroded or damaged.
Can I keep driving?
The vehicle may drive normally, but do not rely on the fuel gauge or low-fuel warning to estimate remaining range. Refuel earlier than usual and track fuel use until the reading is reliable.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.