Hello,
This sounds like you could have intermittent problems with the electrical connector going from the immobilizer unit to the Powertrain Control Module[PCM]. In the diagrams down below I have included a diagram of the location of this electrical connector and a guide on intermittent or poor electrical connectors for you as well. I would recommend using Electrical OE cleaner manufactured by CRC, which can be picked up at any auto parts store. Please go through these guides and get back to us with how everything turns out.
Thanks,
Alex
2CarPros
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Tuesday, November 5th, 2019 AT 12:26 AM