How to Check a Gas Cap Warning in a Cadillac

Intensified Federal emissions laws forced the auto manufacturers to implement new emission control devices on all vehicles sold in the United States. Cadillac, among others, uses a warning system to alert the driver of a loose gas cap. Operating a Cadillac with a loose gas cap allows gas fumes to escape into the atmosphere, adding to the pollution already in our air. If your Cadillac's gas cap warning light illuminates, there are a few things you can do to check for the cause and remedy the situation.

Instructions

1

Remove your Cadillac's gas cap. Inspect the cap for damage, such as chips, cracks or warping in the plastic or the rubber gasket; replace the cap if you note any.

2

Inspect the gas filler neck for cracks, chips or dents. Reinstall the cap until you hear it click twice.

3

Start the engine and see if the gas cap warning light has turned off; if not, move to Step 4.

4

Look underneath the fender where your fuel filler neck leads to the gas tank, using a flashlight. Inspect the filler neck and fuel lines for any signs of damage or wetness, or any loose lines.

5

Purchase and install a new gas cap. If the light still does not turn off, drive your Cadillac to a certified technician for proper diagnosis and repair.