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2004 Chevy 1500 Pickup CEL When Warm

554 views 1 reply 2 participants last post by  SierraHarley 
#1 ·
My sister's pickup has 280,000 miles on it. The CEL is coming on when the truck has been driven long enough to fully warm up. Coolant levels are correct, not burning oil or overheating. Weird issue. I'll plug a scanner into it this weekend, but figured I'd post here to see if someone has some ideas. I don't know the engine variation because it's a rebuilt (60K miles ago). CEL coming on just happened within the last 1000 miles or so. It's never on until fully warm. Truck runs great.

Thanks ahead of time.
 
#2 ·
Make sure you come back and post what code it threw.
 
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