P1350

Ford

Fuel Level Sensor B Intermittent

Definition source: Manufacturer reference catalog
Definition verification: Not independently verified for display.
Time: Varies by diagnosis and vehicle | Diagnostic difficulty: Medium
Low Severity

The fuel-level monitoring system has detected an intermittent signal from fuel level sensor B. That sensor provides information used to estimate how much fuel is in the tank. A fluctuating or inaccurate reading can make the gauge or remaining-range estimate unreliable; the code does not by itself prove the sensor needs replacement.

Report an error with this code

⚠️ Before You Begin (Safety First)

An unreliable fuel reading can leave you without a dependable warning before the tank is empty. Keep track of fuel added and avoid relying on the gauge or range estimate until the fault is diagnosed. Stop driving if the vehicle stalls or develops another condition that makes it unsafe. If you smell fuel or see a leak, shut the vehicle off and get it inspected; do not work around a suspected fuel leak.

Common Symptoms

  • The fuel gauge may move unexpectedly or show a level that does not match the fuel in the tank if the signal drops out or changes intermittently.
  • The remaining-range estimate may be inaccurate or unavailable when it depends on the affected fuel-level information.
  • The low-fuel indication may not reflect the actual fuel level, depending on how the vehicle uses this signal.
  • There may be no noticeable symptoms if the intermittent signal does not affect the displayed reading when observed.

Common Causes

  • An intermittent connection at the fuel level sensor or its wiring can interrupt the signal.
  • Damaged, corroded, or poorly seated wiring or connectors can cause an unstable signal.
  • The sensor may have an intermittent internal fault, but the code alone does not confirm sensor failure.
  • A circuit, power, ground, or receiving-module issue may affect the signal; vehicle-specific testing is needed to distinguish these possibilities.

Diagnostic Steps

  1. Note whether the fuel gauge or range estimate changes unexpectedly, and compare the reading with the amount of fuel added. This helps establish whether the reported fault matches a visible symptom.
  2. With the vehicle safely parked and the ignition off, visually check accessible fuel-level sensor wiring and connectors for looseness, corrosion, or damage. Do not open the fuel tank or disturb fuel-system components.
  3. Check for other diagnostic codes and record them before clearing anything; related codes can help identify a wider circuit or display issue.
  4. If the fault returns or the gauge is unreliable, have the sensor circuit checked using service information for the exact vehicle. Avoid replacing the sensor based on this code alone.

When to Call a Professional

Check scan data for the reported fuel-level signal and compare it with the gauge behavior while the fault is present. Inspect accessible connectors and wiring for loose connections, corrosion, damage, or signs of intermittent contact. Use model-, year-, and engine-specific service information to identify sensor B and its circuit before testing; confirm the circuit fault before replacing parts.

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Commonly Asked Questions

Does this code prove the fuel level sensor needs replacement?

No. It identifies an intermittent fuel-level sensor B signal, but a connector, wiring, circuit, or receiving-module issue can produce an unstable signal too. Diagnose the circuit before replacing parts.

Can I keep driving with this code?

The code concerns fuel-level information, but an inaccurate gauge can make it difficult to know when the tank is nearly empty. Track fuel manually and stop if the vehicle stalls or becomes unsafe.

Why might the fuel gauge look normal even though the code is present?

An intermittent fault may not be active all the time. The gauge can appear normal when the signal is stable and become inaccurate when the connection or signal drops out.

Is sensor B always the same part or in the same location?

No assumption about its location or exact arrangement is safe without vehicle-specific information. Applicability and identification depend on the model, year, and engine.

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