I think I tried my best searching here but still didn't find luck.

So the 4.8is tranny has just been recently overhauled by an indy. Shifts buttery smooth I can tell you. Following day after driving 3-4 km, car wont start and the trans fail prog error appears on the dash with the trifecta lights on as well.
Checking with INPA, the trans control unit could not be accessed and at one point the engine ECU as well. When the engine ECU could be accessed, fault code says something about CAN bus signal not returned or something.

Leaving the car off for about 2 hours the car will start again and could be driven with the sports or manual mode intermittently inoperable.

Sounds like a communication issue to me but not really sure where to look at. I also dont have access to the wiring diagrams at the moment.

Would really appreciate your guidance.

Thanks
Joy
E53 4.8is 2005 at 223000km




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2004 X5 4.8is Pinoy from the land of sand