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Discussion Starter · #1 ·
truck started and then died out after testing with scan tool found i wasnt able to communicate with the ecm, but access all other modules on ccd bus.after diag replaced ecm. now vehicle still wont start and now for some reason i cant communicate with the pcm either. performed all wiring and bus tests that were layed out in all data and everything checks fine........what the hell
 

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So what codes were present?
 

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Discussion Starter · #3 ·
i got a p1694-no messages recieved from companion module in the pcm originally, and followed the repair manual diag flow chart to come to the conclusion of the ecm failure
 
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