Hello my name is Dave.
It sounds like you have lost one or more of the voltage feeds to the engine control module, I have attached diagrams showing the three different circuits that should be checked and a link to our tutorial on testing wiring. If any of these have lost voltage there would be no communication with the scanner.
https://www.2carpros.com/articles/how-to-check-wiring
Please note that fuses 2, 8 and 22 supply the engine control module. I hope this is helpful and if you need any further assistance we will be happy to help in any way we can and thank you for using 2CarPros.
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Friday, November 2nd, 2018 AT 10:39 AM