Check Engine Light came on

[Marques]

So this morning I start off to work and my CEL came on.  Not sure why.  I know it's hard to give suggestions to what it could be, but to help you out I have 88000 miles on my 2004 Avy, it's due to have the oil change, and I do know my fan clutch needs to be replaced.  Could that be the problem?  No other issues that I have noticed are wrong with my truck though.  All levels are fine with fluids and all.

Thanks

Marques

[DougD]

Get the code.  Any other guesses have no meaning.

[PerfectReign]

AFAIK, you can go to Autozone or Pep Boys and have them read your codes. They should do it for free.

[ramonday]

Or if you really feel frisky, this has been a terrific investment for me: http://www.amazon.com/Actron-CP9125-PocketScan-Code-Reader/dp/B0007LEG2K

It'll even clear the codes once you get the problem solved. Quick and easy. I recently put on a new water pump and didn't get my MAF sensor plugged in all the way while I was buttoning everything up (see Busch Light), and the next day threw a code. Plugged it in and immediately pointed me to the MAF. Very cool device. Saves me curse words and part throwing.

[MS03 2500]

Yep the CP9125 is a great little code reader I keep one in the AV all the time.

[ecimiguel]

I had the exact same thing happen to my 03 z71 avalanche with 64,000 miles. Mine said on the screen change engine oil. I havv never had that happen before. I found it odd for the light to come on. I'm going to take it to auto. Zone tonight to figure out the problem.