740i warning message drivetrain issue - Bimmerfest - BMW Forums



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Old 07-04-2020, 05:41 PM
westaussie323i westaussie323i is offline
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Mein Auto: 2010 F01 740i
740i warning message drivetrain issue

Hoping someone can shed some light on this issue I had yesterday while on a 700km round trip.

Selected Sport+ (2010 740i) and was going hard at it for lets say 5-10 mins at 140-200 kmh hit redline a couple of times out of corners then after a fast overtake the main screened flashed up with Drive Train Malfunction drive moderately for rest of journey full performance not available contact service. I plugged in Torque Pro and zero faults found but it seemed randomly to clear and I would get performance but when I got back to town I kicked down and message came up at about 5500 rpm. The car doesn't run rough at all but when message is up it feels like restricted throttle. 83k km full service history, new coded battery and zero faults on Torque and also at dealer level prior to purchase.

Quite often with my E46, E39 M5 and E38 750il a battery disconnection usually sorted things out but I am new to these later models and don't want to screw anything up. At $220 per hour I want to go to dealer prepared so I don't get screwed (hoping I dont have to)
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  #2  
Old 07-04-2020, 07:42 PM
HerbP HerbP is online now
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Mein Auto: 05 645Ci, 14 750 M-Sport
Not knowing your model number transmission, I would suspect that the Mechatronic adapter seal is allowing fluid to bypass the valvebody? I could be low on fluid, as a 1/2 qt. makes a big difference.

http://bmwfans.info/parts-catalog/F0..._mechatronics/
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Old 07-05-2020, 02:05 PM
westaussie323i westaussie323i is offline
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thanks for the suggestion and will look into that
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Old 07-06-2020, 03:04 PM
Jerry 745Li Jerry 745Li is offline
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So many things can cause the Drivetrain Malfunction. They range from fuel injectors, coils, plugs, high pressure fuel pump, transmission, and more. It's not possible to guess what's wrong without a proper diagnosis. You can either find an independent BMW service center to diagnose it or you can get ISTA up and running on a laptop and use the same software the BMW techs use to diagnose your own vehicle. It is not hard to get going. Complete instructions are on this site including the software and links to purchase the proper eNet cable. Just search for "ISTA download" in these forums to get started. Good luck.

Jerry
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Old 07-06-2020, 04:45 PM
westaussie323i westaussie323i is offline
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Mein Auto: 2010 F01 740i
Thanks Jerry have spoken with my independent German mechanic and his first thought was most likely transmission and I always service my trans when I buy a new car but this just brings that forward. I do have ISTA on a laptop somewhere just need to find the cable and try and work it out so thanks for reminding me about ISTA.
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Old 07-06-2020, 06:37 PM
HerbP HerbP is online now
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ISTA would be the way to go for the diagnostics, but charge your battery just to rule out low voltage.
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