Check Engine Light
I have 2007 GMC Envoy SLE. Check Engine Light is on. Took it to one auto parts store told no
active codes just 30 history codes. Took it to second auto parts store and told that it was P040
(gas cap). Took it to dealership and was given these codes:
P0480, P0483, P0496, P0455, P0411, P0326, P0411, P0017,P0014, P0133, P0133, P0171,
U1016, U1064 and U100.
Truck is running fine. Not sure if it's the main computer or something else. Changed gas cap
(from factory), changed fuel injector and cleaned same. Light has been on for over a year. Trying
to go through admissions.
Any suggestions.