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8.9 is pulling my trailer without the trailer we are getting 12.6 and yes on the code 5 times and they are unable to diagnose the issue just keep clearing it and why I have opted to go to another dealer
I have a 23 3500 HO and having the same issues and told need to drive it harder that the truck is not designed to just get in and drive to town and i call BS as well I have been to the dealer 5 times in the last few months. Pulling my trailer on the highway or not milage down to 8.9 I have it...