Ford focus 2005 radio
SOURCE: After jumping a dead battery
I have seen the PRNDL switches on these vehicles cause all kinds of problems including erratic radio operation, engine stalling, transmission erratic shifting, engine control fault codes, etc. I had one that kept losing the programmed stations on the radio and the radio would cut in and out while driving. I have not figured out exactly how the PRNDL switch fits in to all of this with the radio. I believe it is shorting the class 2 data circuit or something. I would look there for a solution to your problem.
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