What happens to CAN signals on the entire network when one module has a bad ground? Can this problem be missed if the network is not measured a certain way?
How do you isolate which module is causing the problem? When main grounds test good on the affected module, can testing a sensor ground or the 5v ref circuit aid in your diagnosis? Watch this video to answer these questions!

symptoms:
No communication with transmission control module causing a no crank no start condition.

Related video:
Sensor grounds and the 5v reference circuit (a 2016 ScannerDanner Premium video)
   • Sensor grounds and the 5v reference c...  

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For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com as an eBook or paper book.
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