P1349
FordFuel Level Sensor B Circuit High
The vehicle detected a high electrical signal in the Fuel Level Sensor B circuit. This sensor circuit provides fuel-level information to a control module; the code does not prove the sensor itself has failed. The fuel gauge, low-fuel warning, or remaining-range estimate may be inaccurate. Exact system details depend on the vehicle’s model, year, and engine.
⚠️ Before You Begin (Safety First)
If the fuel gauge or low-fuel warning is unreliable, do not rely on it to judge how much fuel remains; refuel conservatively and track mileage. Stop driving if you detect a fuel leak or smell fuel, and have the vehicle inspected. The code alone does not indicate a fuel leak.
Common Symptoms
- The fuel gauge may read higher or lower than the actual fuel level if the reported signal is inaccurate.
- The gauge may move erratically or fail to respond normally if the signal is intermittent or out of range.
- The low-fuel warning or remaining-range estimate may be inaccurate because it depends on fuel-level information.
- There may be no noticeable symptoms if the vehicle’s display continues to show a plausible reading.
Common Causes
- A fault in the Sensor B wiring or connector may cause the circuit signal to read high.
- An open, damaged, or poorly connected circuit can interfere with the expected signal.
- The fuel-level sensor may be producing an abnormal signal, but the code alone does not establish that it has failed.
- A control-module input or related circuit fault is also possible and requires testing before parts are replaced.
Diagnostic Steps
- Compare the displayed fuel level with how much fuel you know is in the tank, and refuel conservatively if the gauge may be inaccurate.
- With the vehicle safely parked, visually check any accessible wiring and connectors associated with the fuel-level system for damage, looseness, or corrosion; do not remove the tank or work near fuel vapors.
- If you have a scan tool that displays fuel-level data, compare its readings with the gauge and note whether the data is stable or erratic.
- Have a qualified technician test the Sensor B circuit and module input using service information for your exact vehicle before replacing a sensor or module.
When to Call a Professional
Confirm the code and check available live fuel-level data before replacing parts. Inspect the relevant wiring and connectors, then test the Sensor B circuit and module input using the vehicle-specific service information. A high circuit reading can result from wiring or connection faults as well as a sensor or module problem.
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Commonly Asked Questions
Does this code prove the fuel-level sensor needs replacement?
No. It identifies a high signal in the Sensor B circuit, not a confirmed failed part. Wiring, connections, the sensor, or a module input may need to be checked.
Does “circuit high” mean the tank is full?
No. It describes the detected electrical signal, not the actual amount of fuel in the tank.
Can I keep driving with this code?
The code alone does not show that the engine cannot be driven, but an inaccurate gauge or warning can leave you without a reliable fuel-level indication. Refuel conservatively and arrange diagnosis.
Why might the gauge still appear normal?
The displayed reading may remain plausible even when the circuit signal is abnormal, or the fault may be intermittent. Scan data and circuit testing can help distinguish these cases.
Browse Available Code Guides
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