Check Engine Light Due to Gas Cap Issue on GMC Safari

Problem Description and Possible Solution

Illumination of the Check Engine Light can be caused by a loose or worn gas cap.

Problem Data
RepairPal Verified
Average mileage: 110,000 (110,000–110,000)
10 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002, 2003, 2004, 2005
13 people reported this problem
Viewing 1 - 3 of 3 comments
Ses light came on. code po449 came up on scan tool. replaced purge valve...part shop suggestion..no fix to ses.. swiched out gas cap with another van(astro) ses came on in astro. ran scan on it....same code. replaced gas cap on safari and now no problem!
Just replaced the gas cap and it went away
i have had problems with the check engine light and gas cap