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Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!

No ECM communication

  • djc7011
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1 year 10 months ago #63901 by djc7011
No ECM communication was created by djc7011
2011 GMC Acadia. Runs ok. When I plug in any scan tool there is no communication with the ECM. There is communication with TCM, ABS, OBD2, etc. All other modules seem fine. I can see live data too. If I try to access bidirectional functions of the ECM I get a link error message. The ECM has been replaced and the old unit had the same issue.

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  • Noah
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1 year 10 months ago #63947 by Noah
Replied by Noah on topic No ECM communication
Do other modules set codes for loss of communication with the ECM?
"Ground cannot be checked with a 10mm socket"

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1 year 10 months ago #63965 by djc7011
Replied by djc7011 on topic No ECM communication
There are no other codes. It only seems to affect selecting ECM functions on the scan tool. 3 different scan tools were tried.

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