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#1
02-13-2016, 04:42 PM
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Another trans fail safe
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 Sent from my iPhone using Tapatalk
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2004 X5 4.8is Pinoy from the land of sand 
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#2
02-14-2016, 01:25 AM
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Tried checking with INPA again while the engine is running but still there is no response from the gearbox control unit it says. Car can be driven but no sports or manual mode option. 🤕🤕
Sent from my iPhone using Tapatalk
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2004 X5 4.8is Pinoy from the land of sand
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#3
02-14-2016, 01:54 AM
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Found this
Intermittent No Start, Transmission Failsafe Mode, Engine Shut-off - Bimmerfest - BMW Forums I'll update later about progress........
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2004 X5 4.8is Pinoy from the land of sand
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#6
02-14-2016, 09:29 AM
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What's the voltage on the battery when connected to the car?
What's the voltage on the battery when the car is running?
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2001 E53 4.4 Alpine White, Sports Package 2000 E36/7 2.8 5 speed Bright Red w/ a HT! 
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#8
02-14-2016, 07:36 PM
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I would look at the cable that is attached to the TCM. Could be corrosion in the connector terminals.
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2006 Infiniti G35 2001 BMW 3.0I E53 X5 Build date 08/2000 SOLD Lotus Europa 1970 Destroyed by fire Lotus Europa 1970 S2 Renault Powered Lotus Type 52 1970 Twincam Webers Powered PORSCHE 911 Targa 1982 The Garage Queen Audi Avant donated to Kars for Kids BMW 525IT Sold Audi 4000CS Quattro Sold Jensen Healey Lotus Powered Sold Opel 1900 Sold Triumph Spitfire 1971 Sold Triumph Spitfire 1968 Sold Plymouth "Cuda" 340 Six pack SOLD
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#9
02-17-2016, 12:06 AM
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Well the X would always start now. Error message is gone for now.
upallnight is right, it was just the connector to the TCM. Now, on to the next problem!! Looks like a front diff change is coming!!!
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2004 X5 4.8is Pinoy from the land of sand
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#10
02-19-2016, 11:05 AM
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That didn't last long! TCM is not responding again.
Is the TCM connector supposed to be dry? I notice the contacts always have oil in it when I pull the connector out. Sent from my iPhone using Tapatalk
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2004 X5 4.8is Pinoy from the land of sand
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