Quote:
Originally Posted by Kernel Kurtz
And no engine issues then? If that is the case IMO it is the extended bouncing off the limiter that causes the CEL, and the lack of shifting is the root cause. I'd guess a problem with the Transmission Control Unit, but I'm far from an expert. Being in Germany you should have no shortage of experts though. Good luck and let us know when you get it figured out.
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100% agree with this logic. Doesn't sound like a mechanical problem since it does shift into 4th manually. One thought I had was that if you were ever planning on tuning the trans with XHP you could install that and see if there are any codes to be read (not sure if the CEL codes you have access to now also read TCU specific readings?). Then you could also play around with RPM shift points to see if you could change the behavior. Something I would consider in the event I couldn't find a place I trust to properly diagnose the issue. And, the XHP trans tune is pretty sweet so why not??