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Just wanted to share, I experienced it twice before on my 2018 BMW 530ex only for it to disappear after turning the car on and off.
It happened the first time at 80,000 miles when I was driving in the early morning and I felt my car getting stuck in 1st gear and as soon as I let go of the accelerator, it shifted and got the error.
Second time at 87,000 miles was when I was cruising in the highway and typically when you let go of the accelerator, the HV battery will charge but my gauge indicated that it was not charging. Shortly after, I saw the drivetrain malfunction error.
Both times I’ve restarted my car shortly after getting the error, only for it to not show up again. I’ve had the dealership and my mechanic check for error codes and both found nothing! I’m nearing 96,000 miles and I haven’t experienced it since (hopefully not anymore).
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