Ok that would be great just tell me where..

 

Looks like I need to be there by 1pm on Friday so after I'm done with that. If you aren't familiar the SSI office is at Shepherds mall. PM me your number and I'll call you when I get finished.

 

Try doing a scan when the light is on and leave the engine running. The cheap scanners use what is called Global OBD II protocol. It will usually pick up any current DTC info. Many do not show history.

 

If the light has constant 12v and the PCM turns it on by grounding it, then a short on the ground side of the circuit would leave the light on at all times with no codes...I've seen this happen on Toyota's in the past. Not sure if the GM MIL works the same way though. As mentioned, if it's a manufacturer specific code though, the generic AutoZone scanner won't pick it up...

 

There are P, U, C and B codes. Yours could be an Enhanced Code(manufacturer specific). All manufacturers have enhanced codes as well as generic ones which are required by the OBDII EPA mandate. If you're going to fix cars and trucks you need a decent scan tool. You can get a good PC based scan tool for a few hundred dollars these day. Most handheld units are very limited even though the TechII is handheld and costs thousands. If you work on GM TechII is the way to go. GM is phasing out the TechII and will soon use PC based.

 

I have two generic scan tools, but the one has a GM Enhanced Upgrade and includes knock retard, while the other is just OBDII Generic, but will read ABS codes for GM, Ford, and Chrysler...some day I hope to EFILive though...

 

Hmm, wild shot in the dark here.....

Are you sure it isn't the oil change light?

 

Pretty sure it will just flash "CHANGE ENGINE OIL" on the display and there isnt a specific light for it....thats how mine is anyway (04).

 

That's the way my 99 is also...

 

That's the way my 2001's are also. Some of the newer GM's have a light on the dash that shows an engine with a wrench next to it, and it stays on while driving (after the message center goes out.)

I can't tell you how many customers brought their cars in for "check engine lights" that were actually "change oil lights", so I thought I'd ask. Apparently not the case here.