I had a similar problem when I installed the JB+
My issue was that I had the device flipped around 180 degrees (not the wrong ends, duh). You will know if it is in correctly because it will have a little bit of resistance. When I first tried plugging it in, it was way too loose.
Check engine light, and limp mode came on, but once I put it in correctly, all was normal. I just purchased a BT tool because I don't want to take any chances. I would suggest you do the same.
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