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Grid heaters not working since high idle cold start enabled at dealer


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It seems since I brought my truck into the dealer for the 3 cylinder high idle cold start enabling my grid heaters haven't worked. I see the wait to start light come on but the voltage doesn't change. I have to plug it in even at 0'C now or it won't start. Lots of white smoke for the first few minutes when I do get it running . Could there be another problem I'm missing maybe? Can a dealer possible program stuff to mess up or maybe accidentally delete my grid heaters somehow?

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The P0234 is probably cause by a heavy foot and the smaller boost elbow. P0500 I heard is from spinning the tires and not really moving, not sure if that's totally true. But with the torque of these truck on icy streets it happens a lot .

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So I took it to the dealer this morning because I wanted them to check and make sure they never set something off. They told me it was my relays and it happens a lot ... I checked for codes as soon as I got back in the truck. Now it says PCU 0500,1694, 1693 and ECU 0382, 1693. Why wouldn't that show up before I gave it to them?

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