The P0656 trouble code indicates a malfunction in the fuel level output circuit. This circuit is responsible for providing the engine control module (ECM) or powertrain control module (PCM) with data regarding the fuel level in the fuel tank. If the ECM or PCM detects a fault in this circuit, it will trigger this trouble code.
P0656 Fuel Level Output Circuit Malfunction
Code symptoms P0656.
1. Illumination of the Check Engine Light (CEL).
2. Inaccurate or erratic fuel level gauge readings.
3. Fuel level gauge may read empty or full regardless of actual fuel level.
4. Other related trouble codes may be present.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0656.
1. Faulty fuel level sensor.
2. Open or short circuit in the fuel level output circuit.
3. Corrosion or damage to wiring or connectors in the circuit.
4. Faulty ECM or PCM.
Code Solutions P0656.
1. Inspect the wiring and connectors in the fuel level output circuit for any signs of damage, corrosion, or loose connections. Repair or replace damaged components as necessary.
2. Check the fuel level sensor for proper operation. Test its resistance and signal output using a multimeter according to manufacturer specifications.
3. Clear the trouble codes and perform a test drive to verify if the issue persists. If the code returns, further diagnosis may be required.
4. If no issues are found with the wiring, connectors, or fuel level sensor, the ECM or PCM may be faulty and require replacement.
5. Follow manufacturer-specific diagnostic procedures outlined in the vehicle’s service manual to accurately diagnose and repair issues related to the fuel level output circuit. If needed, seek assistance from a qualified technician or dealership.