So, my 14 2500 decided to up and give me the bird today. I recently had surgery and have been unable to drive. My dad came down to help out while I healed and drove my truck a couple of times. Well it sat for about a week. Went to start it today and the dash displays the following:

Service antilock brake system, service airbag system, low oil light, CEL, parking brake on even though it isn't, service tow system.

The DEF guage doesn't move and the shift indicator light didn't come on. Everything powers up but it won't even attempt to engage the starter.

Battery voltages are 12.8/12.86. I don't know what to do.

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