<FONT size=2>I own a 1999 Tahoe. When I pull my 14' trailer or drive in excess of 80 mph for 100 miles or more the light comes on and stays on for a couple of days then go off. Does anybody have any suggestions on what could be causing this ?? It has happened about threeor four times.</FONT></P>


<FONT size=2> Thanks,</FONT></P>


Dondobe</P>


</P>


</P>

 

The problem that was causing my Service engine light to come on under these conditions was my cap &amp; rotor. There was a lot of build up on the terminals, making it misfire under a load and higher speeds. </P>


Dondobe <IMG src=smileys/smiley1.gif border="0"></P>

 

I have had the same problem with my 99 Tahoe when I tow my 5x10 trailer loaded down. The light usually comes on when I am going up a hill and the truck shifts out of overdrive to take the hill. I had it scanned and the only thing that it showed was a misfire code. I was told to drive in 3rd instead of OD when towing. Wish I could be more help.