You have to pull the code to find out what it is.
If the MIL/CEL light appears and then goes away, it's a warning but not a serious problem. I'd still get it checked anyways.
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1997.5 HMC4 Hummer H1 w/Slantback shell (Mine)
2006 Hummer H3 Adv. Package (Wife's)
M101A2 Trailer
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