check engine soon light stays on when pulling a trailer on 1990 Chevrolet 1500 Pickup

After I put a load in my trailor I go approx. 15 miles then the "service engine soon" light comes on steady and stays on. I turn off the engine unload my load, I start the truck up the light is out,It does it everytime. When I go a distance with the trailor empty the light does not come on at all.

by in Roseville, CA on June 27, 2010
1 answer
ANSWER by on June 27, 2010
Once the Check Engine Light has come on a code is stored in the computer it would be interesting to know what code is stored to see if it relevant and worth "fixing".
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