Question about 1996 GMC Sierra

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I have a 1996 GMC Sierra 4X4 5.7 litre engine. It keeps throwing a code that indicates the ignition control module is bad...I replaced it and it ran great. But the check engine light keeps coming on. It will intermintally come on and go off when I restart the engine. Now the engine is dying when it gets hot again, just like it did before i replaced the module. Why woud it keep making the module go bad?

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Wow, that's a toughy. Perhaps there is some sort of ground to short going on. Other than taking it to a dealership or mechanic, the only thing you can do is change out parts and check voltages. There could be a short in the ignition switch itself. Has the truck ever been in a wreck? Have you had this vehicle very long? You can also change out the ignition relay and see if maybe its sticking. I wish I had better news for you. I hope this helps in some small way.

Posted on Mar 19, 2011

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Posted on Jan 02, 2017

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An open or ground in the EST circuit will stall the engine and set a Code 42. The engine can be re-started but it will run on ignition module timing.
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Thank you for using fixya and keep us posted

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