Help me please
I have an '06 LBZ, in the spring it threw a Glow plug code installed new ADC Delco Glow Plugs, light went out about a week later I get a Glow Plug Controller code. Replaced it still got code replaced it with a known good one nothing.
I drove it with CEL and Glow plug light on started having transmission issues long story short disconnected the GPC and the transmission is fine but I have no Glow Plugs and winter is coming.
We have shot all the wires as have 2 shops checked ground connections we are just stumped any input would be greatly appreciated