The P0656: Fuel Level Output Circuit Malfunction code refers to an issue in the fuel level output circuit, which is responsible for reporting the fuel level to the vehicle’s display or control module. This issue can be caused by a faulty fuel level output circuit, wiring problems, or a defective fuel level sensor. If unresolved, it can result in inaccurate fuel level readings.
P0656 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0656: Fuel Level Output Circuit Malfunction |
| Is it serious? | No, but it can cause incorrect fuel level readings, leading to running out of fuel unexpectedly. |
| Possible causes | – Faulty fuel level output circuit – Wiring issue – Faulty fuel level sensor |
| How to diagnose? | – Test fuel level output circuit – Inspect wiring and connectors – Replace fuel level sensor or circuit if necessary |
P0656 Meaning
The P0656 code indicates that the vehicle’s control module has detected a malfunction in the fuel level output circuit. This circuit relays information from the fuel level sensor to the fuel gauge or control module. A failure in this circuit can cause incorrect or fluctuating fuel readings, leading to confusion about the actual fuel level.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for additional codes related to the fuel system or electrical circuits that may help narrow down the problem. | OBD-II Scanner |
| Test the Fuel Level Output Circuit | Use a multimeter to test the voltage and continuity of the fuel level output circuit to ensure it is functioning properly and relaying correct signals. | Multimeter |
| Inspect Wiring and Connectors | Inspect the wiring and connectors associated with the fuel level sensor and output circuit for damage, loose connections, or corrosion. | Flashlight, Multimeter |
| Test the Fuel Level Sensor | Test the fuel level sensor to ensure it is accurately measuring the fuel level and sending the correct data to the control module. Replace if faulty. | Diagnostic Tool, Multimeter |
| Replace the Fuel Level Sensor or Circuit if Necessary | If the fuel level sensor or output circuit is found to be faulty, replace the necessary components to restore proper fuel level readings. | Replacement Sensor, Tools |
| Clear the Code and Test | After repairs, clear the code using an OBD-II scanner and test the vehicle to ensure the fuel level is being reported correctly. | OBD-II Scanner, Vehicle Manual |
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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)