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.
Circuit Description
PCM uses fuel level input in order to calculate expected vapor pressure within the fuel system. Vapor pressure vary as fuel level changes. Vapor pressure is critical in determining if EVAP system is operating properly. PCM also uses fuel level to determine is fuel system is too high or too low to be able to accurately detect EVAP system faults.
DTC will set when fuel level input has not changed more than 1.6 percent in 120 miles.
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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.