DTC P0656 pertains to a malfunction in the Fuel Level Output Circuit. This trouble code signifies an issue with the circuit responsible for managing and controlling the fuel level sensor output.

1. What does P0656 code mean?

DTC P0656 indicates a problem within the Fuel Level Output Circuit. This code is triggered when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects an irregularity or failure in the circuit responsible for transmitting fuel level data.

2. What are the causes of DTC P0656?

Potential causes for DTC P0656 may include:

• Faulty Fuel Level Sensor: A malfunctioning or inaccurate fuel level sensor can trigger this code.
• Damaged Wiring or Connectors: Corrosion, wear, breaks, or disconnected wiring associated with the fuel level sensor or its circuitry can cause issues.
• Defective ECM/PCM: An internal failure within the ECM/PCM managing the fuel level sensor circuit can result in this error.

3. What are the symptoms of DTC P0656?

Symptoms associated with DTC P0656 may include:

• Inaccurate Fuel Level Readings: The fuel gauge may provide incorrect readings or behave erratically, displaying an inaccurate fuel level.
• Malfunctioning Fuel Gauge: The fuel gauge might not function properly, staying at a particular level despite changes in fuel quantity.
• Check Engine Light: The Check Engine Light might illuminate to signal an issue with the fuel level sensor circuit.

4. How to diagnose DTC P0656?

Diagnosing DTC P0656 involves various steps:

• Code Scan: Utilize an OBD-II scanner to retrieve the trouble codes and pertinent data stored in the ECM/PCM.
• Visual Inspection: Inspect the fuel level sensor, wiring, and connectors for signs of damage, corrosion, or loose connections.
• Wiring and Sensor Testing: Conduct checks on the fuel level sensor and associated wiring for continuity, shorts, or open circuits using a multimeter.
• ECM/PCM Analysis: Test the ECM/PCM functionality related to the fuel level sensor circuit.

5. How to fix DTC P0656 problem?

Potential steps to resolve DTC P0656 may include:

• Replace Fuel Level Sensor: If the sensor is faulty, replace it with a new, compatible sensor.
• Repair Wiring/Connectors: Address any damaged or faulty wiring, connectors, or terminals associated with the fuel level sensor circuit.
• ECM/PCM Replacement: In rare cases, a malfunctioning ECM/PCM might need replacement.

Conclusion

DTC P0656 indicates a malfunction in the Fuel Level Output Circuit, affecting the accuracy of fuel level readings displayed on the gauge. Thorough diagnosis and rectification of underlying issues are essential to ensure proper fuel level monitoring and gauge functionality.