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I have a 2020 2500HD LT (L5P). Replaced both batteries due to slow crank in the morning. After replacing them, now truck won't crank. Checked for codes and getting 3 codes with "loss of communication". Fuses were checked and all were good. Not sure what else to do but take to the dealer for service. Has anyone ever encountered this issues?  

  • 3 weeks later...

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