Check Engine Light Due to Gas Cap Issue on Chevrolet Tracker

Problem Description and Possible Solution

A Loose or worn gas cap may cause Check Engine Light to illuminate.

Problem Data
RepairPal Verified
Average mileage: 118,294 (58,000–169,500)
7 model years affected: 1998, 1999, 2000, 2001, more2002, 2003, 2004
23 people reported this problem
Viewing 1 - 9 of 9 comments
gas cap makes the check engine light come on. bought new cap worked for two days now its back on after I refuel.
Same check engine light.
Tires Plus reset the warning light after a diagnostic test showing that it was the gas cap. 1 1/2 months later I am stranded when the fuel pump goes out. Coincidence???
replaced the gas cap and the code went away. Cheap fix!
code is for gas cap ... but not the fix ... had to tent the car and smoke it .. found small leak in plastic fitting .. 5 dollar part fixed no issues since ... for others , that code for gas cap is also code for the entire vac system tent it was only way to find fix .. Hope this helps
I am the original and only owner of my 2003 Tracker LT and noticed that my check engine light goes on when gas cap is not on properly. Even though I replaced the cap 2 times and checked the tightness of the cap. It is annoying but really happy that's all it is.

Solution: If light goes on, check gas cap and/or replace cap yearly. Very inexpensive.

Please note, when check engine light comes on, first check gas cap then other issues. :)
My check engine light comes off and on because of gas cap problem
Check engine light was diagnosed as gas cap. I replaced it..Drove for one day now check engine light is on again
Computer sensor "check engine" light came on. Local auto part store computer check stated " to check gas cap". Sensor light went off.