Check Engine Light

Asked by Jun 30, 2013 at 03:58 AM about the 2007 GMC Yukon Denali AWD

Question type: Maintenance & Repair

05 gmc denali chk engine light
flashing, engine loosing power,
vibrates ... all of a sudden, no
previous issues, maintenance on
track. Any guesses

4 Answers

4,955

Could be anything, you need to hook it up to a code checker to find out why the CEL came on. Vibration is always a bad thing for an engine, but with the info here it could be anything from ignition or fuelling issues to serious mechanical problems.

228,525

Yes, why guess?

Thanks Lars, had it towed so waiting for mechanic to open for business....hoping for the best

32,855

Check engine lights flash because there is a misfire. A misfire will quickly destroy your catalytic converter costing a lot of money to replace.

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