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attached device may be preventing your vehicle's diagnostic test

sjdraper
Visitor

I have been receiving from on-star  "an attached device may be preventing your vehicle's diagnostic test from completing.  Unplug any devices from the diagnostic port and try again later."

 

Car  was taken in for service and found everything was fine.  I then take the car out after two weeks and we are receiving the same issue.  I am sure there isn't anything attached to the diagnostic port because this is the same message after we took it in and had the diagnostic test done.  We only have 500 miles on the car.  

 

 

1 REPLY 1

Advisor_Kaitlyn
Moderator
Moderator

We recommend first uninstalling/reinstalling your app as it is a quick troubleshooting step. If that does not remove the error message, pushing your blue OnStar button will connect you with the Technical Teams who are the most knowledgeable and helpful for issues like this. There may be internal errors that only they will be able to resolve. Be sure to mention that you have already taken your car to your dealer for this issue because they may also recommend that.