Check Engine light on 2003 Cadillac Escalade

Check engine light comes on when the gas tank is below 1/2. Replaced gas cap and that seemed to help for awhile, but its doing it again? Any ideas?

by in Phoenix, AZ on February 22, 2011
1 answer
ANSWER by , February 22, 2011
Have you had the computer checked for codes? If not, I would start with that. A computer code helps you know where to start testing. Some of the retail parts stores will check your codes for free.