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.
Check Filler Cap Indicator Light
After refueling and turning ignition on, PCM detects a fuel level increase. When the ignition is turned off, PCM activates a brief test to check filler cap. If filler cap was not properly installed and vehicle is started and driven at a speed greater than 6 MPH (10 Km/h), the CHECK FILLER CAP light on instrument panel will illuminate for 25 seconds, then go out. The second time the ignition is cycled off, PCM is activated to test filler cap. If loose, when vehicle is started and driven at a speed greater than 6 MPH (10 Km/h), CHECK FILLER CAP light will be illuminated for 25 seconds, then go out. If filler cap is properly secured, Malfunction Indicator Light (MIL) will not be illuminated and a fault code will not be stored in PCM. The third time ignition is cycled off, PCM is activated to test filler cap. If loose, a LARGE LEAK fault code is stored in PCM. MIL will be illuminated the next time engine is started. Variable indicator light and PLEASE CLOSE FILLER CAP check control message will be displayed.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.