2018 JL Service Code Issues

[Joesam]

My JL check engine and all other warnings such Brake, Service Shifter ect; are illuminated and it won't engage in Drive..... I'm told there may be a bad ground I cleared codes and disconnected negative post on battery but all returned.....any clue what's happening ??

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[tk1700]

CanBus behind the glove box. There are several threads on here about it and youtube videos. I had similar lights and codes, replacing the left CanBus solved it all. I got it from the dealer for just over $100. Amazon has them, but they all looked liked cheap knockoffs and the dealer had it in stock.