Hi and thanks for using 2CarPros.
The CC ID codes are indicators of issues the vehicle has. Some indicate a low tire, burned out bulb and other things. The CC ID 420 indicates a transmission malfunction. Hence, limp mode.
Now, that code is generic, meaning it could be many different things related to the transmission. At this point, I recommend either finding a scanner that can read transmission codes or taking it to a shop that has one. The only way I can go further is to know the more specific codes.
I wish I had an easier answer, but I do not.
Please feel free to ask more questions or let me know if you need additional help.
Take care,
Joe
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Sunday, November 18th, 2018 AT 7:35 PM