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Discussion Starter · #1 · (Edited)
My buddy’s dad has a gmc 2500hd with the LLY. Truck will not start when the glow plug light doesn’t come on. Happens randomly, but if the light doesn’t come on it will not start. When it does come on it cranks and runs fine.

Everything else comes on, just not the glow plug light.

A shop he took it to replaced the starter and “shift switch” as he called it, issue still present. The shop said that they were receiving 12v at the gp “sensor” if that’s right and that his ecm was on the fritz.

looking for a second opinion before he drops more money into replacing something that doesn’t need it.
 

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Discussion Starter · #2 · (Edited)
ended up being a bad ECM. Replaced it and everything has been fine.
 
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