Mazda Repair Questions? Ask Mechanics for Answers ASAP
My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
From what you have described here this sounds like a possible fault in the PCM itself.If you know for sure it is misfiring and the PCM is not setting codes and you have communication issues with the scan tool intermittently as well as the U codes this can be the PCM itself at fault.The U0100 code is usually a loss communication with the PCM.I would make sure all wiring and connections to the PCM are all o.k. and if o.k. as well as all fuses most likely it needs replaced.
If you have found a company that can rebuild it then no programming will be needed but if it is replaced all together it will need programmed and usually by a dealer.
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