Can't say for sure - *hands-on* testing will be required!
“They†may have been mistaken - 'IF' “they†actually knew it was something simple - then “they†should have also told you exactly what is was..
RepairPal Certified shops can diagnose and repair your 2005 GMC Envoy. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.