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Have same issue with 2020 3500. The push brake light and sometimes the radio will come on and then go off, dealer said it is RF hub module. They are on back order till November. I was able to pull fuse #51 for the RF hub module so my battery won’t die.
I have the same problem with my 2020 3500. Ignition off light stays on and dash lights come on then radio then they go off. This justs keeps happening until the battery would go dead, I finally pulled fuse F49 and it quit happening. Sounds like a common problem but no solution.
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