2011 GMC Sierra 1500 Questions

All 2011 GMC Sierra 1500 Questions

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check engine light comes on - info panel says engine is hot but all the instrument panels say normal - truck has 61,670 miles on it
Front right bucket seat has something loose on the backside of the seat. I want to take off plastic panel to see what is in there. Looks like it pops off. Didn't want to tear it up as it is a nice pickup. Drives me nu...
does not come on or stay on all the time just about everyday.
Speedometer quit working vehicle has only 7100 miles
I recently purhaced a GMC Serria 1500, 6.2L 403hp pickup new from a dealer. The first week using the gasoline the dealer had in it I got almost 15mpg. The subsequent 4 or 5 tanks of gasoline it gave me 14mpg acordin...