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Just picked my truck up. After 3 weeks they were able to locate the issue. Mine was the front HVAC module that was stuck and draining my batteries if I didn't drive it every few days. They replaced it so we'll see how it goes.
Currently having same issue with my 2022 6.7. It has been at the dealership for 10 days this time. 6 weeks ago, they had it for over a week and told me both batteries were bad. The truck has 10K miles on it. They replaced both batteries and 6 weeks later, same thing. Will post if they find a...