engine light on 1999 GMC Sonoma

engin light is on. engine runs rough at idle, auto zone can not read the computer, why cant they get any info from it

by in McKeesport, PA on January 29, 2011
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
ANSWER by , January 30, 2011
check the cigarette lighter fuse,its integrated with your diagnostic link connecter.if its blown it wont communicate with a scan tool.