BMW Diagnostic Trouble Code P1351 - BMW - Fuel Level Sensor B Circuit High Voltage

Code Definition: P1351 - Fuel Level Sensor B Circuit High Voltage

The P1351 code is a specific trouble code that indicates a high voltage reading in the fuel level sensor circuit for fuel tank B (the rear fuel tank in vehicles equipped with two fuel tanks). This code is typically triggered by a faulty fuel level sensor or a problem with the associated wiring or electrical components.

Possible Causes:

• Faulty fuel level sensor
• Damaged or worn-out fuel level sensor wiring
• Short circuit in the fuel level sensor circuit
• Overvoltage condition in the fuel level sensor circuit
• Faulty fuel gauge sending unit
• Incorrect fuel level readings due to a faulty fuel gauge or dashboard display

Symptoms:

• Illuminated check engine light
• Inaccurate or fluctuating fuel level readings
• Fuel gauge stuck or not moving
• Fuel warning light or message displayed on the dashboard
• Engine stalling or difficulty starting due to a lack of fuel

Diagnostic Procedure:

1. Use a scan tool to retrieve the trouble code and view the freeze frame data to determine when the code was set and under what operating conditions.
2. Check the fuel level sensor wiring and connectors for any signs of damage, corrosion, or moisture.
3. Test the fuel level sensor using a multimeter to measure the resistance and voltage readings. Compare these readings to the manufacturer's specifications.
4. Inspect the fuel pump and fuel delivery system to ensure they are functioning properly.
5. Check the fuel gauge sending unit for any signs of wear or damage.
6. Verify proper operation of the fuel gauge and dashboard display.
7. If the problem persists, consider replacing the faulty component(s).
8. Clear the code and perform a road test to verify the repair.

Repair Information:

1. Replace the faulty fuel level sensor.
2. Repair or replace damaged fuel level sensor wiring.
3. Remove any corrosion or moisture from the fuel level sensor connector.
4. Repair or replace the short circuited or overvoltaged component in the fuel level sensor circuit.
5. Adjust or replace the fuel gauge sending unit.
6. Update the fuel gauge or dashboard display software if necessary.
7. Clear the code and perform a road test to verify the repair.

It's important to note that this is a general guide and the exact repair procedure may vary depending on the year, make, and model of your BMW. Always consult a professional mechanic if you're unsure about how to diagnose or repair an issue with your vehicle.************************ **************