Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Diagnostic trouble code (DTC) information
Condition
Information about the fuel level in the fuel tank is used to determine whether there are leaks during leak diagnosis.
If the control module detects diagnostic trouble code (DTC) ECM-4050 (fault in the fuel level sensor) and ECM-400C (leakage in the fuel tank system), diagnostic trouble code (DTC) ECM-405C is also stored. The diagnostic trouble code (DTC) for the fault is stored in the rear electrical module.
Substitute Value
None.
Possible Source
Faulty signal:
- Fault in the circuit for the fuel level sensor or faulty function (rear electrical module).
Fault symptom[s]
- Gauges/Fuel level not accurate/Value too low
- Gauges/Fuel level not accurate/Value too high
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.