Code Definition: P1250 - Fuel Level Sensor B Circuit Malfunction
The P1250 code is a generic trouble code that indicates a problem with the fuel level sensor circuit in bank B. The fuel level sensor is responsible for measuring the fuel level in the tank and sending a signal to the engine control module (ECM) so that the ECM can calculate the appropriate fuel injection volume. When the fuel level sensor circuit malfunctions, it can cause problems with the engine's performance and fuel efficiency.
Possible Causes:
- Faulty fuel level sensor
- Damaged or corroded wiring harness
- Loose or damaged electrical connectors
- Faulty fuel pump or fuel delivery system
- Low fuel level
Symptoms:
- Illuminated check engine light
- Inaccurate fuel level readings
- Engine stalling or hesitation
- Difficulty starting the engine
- Decreased fuel efficiency
Diagnostic Procedure:
- 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.
- Check the fuel level sensor and its connections for any signs of damage or wear.
- Inspect the wiring harness and connectors for any signs of damage or corrosion.
- Test the fuel pump and fuel delivery system to ensure they are functioning properly.
- Check the fuel level in the tank and make sure it is above the minimum level required by the fuel level sensor.
- If the problem persists, consider replacing the fuel level sensor or the affected component.
- Clear the code and perform a road test to verify the repair.
Repair Information:
- Replace the faulty fuel level sensor.
- Repair or replace any damaged or corroded wiring harness or connectors.
- Replace the faulty fuel pump or fuel delivery system component.
- Adjust the fuel level sensor to ensure accurate fuel level readings.
- Clear the code and perform a road test to verify the repair.
