powerhaulic started following 2020 GMC AT4 - Won't start, won't even attempt to turn over, Dealer trades , Conventional or full synthetic and and 1 other
Had another no start the evening before scheduled appointment for recalls. Drove in with the check engine light on, left it running within 20min the lead diesel tech had the truck in and read all the codes. I left in the loaner, called me next, day diagnosed bad ECU, had truck back the following day. All good so far
powerhaulic replied to rusrtytr4's topic in 6.6L Duramax Diesel & Allison Powertrain (L5P/MGM)Yes the cooling system has more capacity on the 2020, towing 17k I have seen it get to 185ish. I have a Derringer and idash on this truck and had the same on my 2018. The statement earlier about the dash lying is absolutely correct, dash was 210 all the time on my '18, but the Idash reported the actual temp which was 180ish most of the time.
powerhaulic replied to 07HD's topic in 6.6L Duramax Diesel & Allison Powertrain (L5P/MGM)Amsoil is a good product, but for sure not the only quality product to choose. I am a powersports retailer, formerly stocking full line of Amsoil, now I stock mostly Lucas. Do your own research and choose what you feel is best My Duramax is full of Delvac 1, and either a Delco filter or a Wix. My choice is to dump oil at 1000mi new, then every 5000mi thereafter
I have no advise for you, but in the same boat. I have had many P0700 general transmission codes set the light. Each and every time there have been multiple loss of communication codes. The no start with the same dash light conditions you speak of has occurred.twice in 8000mi Dealer has not been able to duplicate, of course. There is no issue running or shifting, and I tow 17k 5th wheel. But sure don't like wondering if it will start......
powerhaulic replied to Dave Taylor's topic in Silverado / Sierra & Future Vehicle Speculation & Spy ShotsThey still make trucks?
powerhaulic replied to Dave Taylor's topic in Silverado / Sierra & Future Vehicle Speculation & Spy ShotsDealer had to order the cord for mine, was not in the truck. But it did come with the winter cover without the camera hole....lol
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