P0656 Fault Code

Fuel Level Output Circuit Malfunction

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0656 fault code refers to a malfunction in the fuel level output circuit, indicating that there may be an issue with how the vehicle's onboard computer is receiving data about the fuel level. This can lead to inaccurate fuel readings and potentially affect the vehicle's performance.

What are the symptoms of the P0656 code?

Symptoms associated with a P0656 fault code may include:

• Inaccurate fuel gauge readings (e.g., showing full when empty)
• Warning lights illuminated on the dashboard, such as the check engine light
• Potential loss of engine power in extreme cases due to incorrect fuel data
• Difficulty estimating fuel range and consumption

What causes the P0656 code?

Common causes for the P0656 code include:

• Faulty fuel level sensor
• Damaged wiring or connectors in the fuel level circuit
• Issues with the engine control module (ECM)
• Short circuits or open circuits in the wiring harness
• Corrosion in connection points

How to fix P0656?

To resolve a P0656 code, the following steps are recommended:

1. Conduct a diagnostic scan to confirm the code and examine freeze frame data.
2. Inspect the fuel level sensor and its wiring for damage or corrosion.
3. Test the fuel level sensor for proper functionality and replace it if defective.
4. Check all related connectors and wires for continuity and repair as necessary.
5. Clear the code and perform a test drive to see if the fault returns.