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David_Smith2003
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Posts: 140
Joined: Fri Mar 03, 2023 7:45 pm

Greetings once more, everyone. I possess a 2012 F12 640D that intermittently displays a dashboard warning indicating a drivetrain issue, advising me to proceed at a modest speed and consult service. I have examined the diagnostic codes, but none provide any insights. Any assistance would be appreciated.
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Jacob_Evans2001
Senior
Posts: 63
Joined: Thu Feb 11, 2021 11:10 pm

If a drivetrain issue is indicated, there will be saved code(s).
What apparatus did you utilise for the scanning process?
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David_Smith2003
Moderator
Posts: 140
Joined: Fri Mar 03, 2023 7:45 pm

The Icarsoft CMAX is reportedly an effective system; nevertheless, the issue may lie with my limited technical proficiency.
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BMW_Fan2020
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Posts: 173
Joined: Wed Jan 01, 2020 2:15 pm

Does the vehicle enter limp mode?The power is reduced to a predetermined RPM range, allowing continued operation at a diminished speed.
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David_Smith2003
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Posts: 140
Joined: Fri Mar 03, 2023 7:45 pm

The vehicle does not enter full limp mode; power is somewhat reduced but sufficient to achieve 70 mph, and acceleration normalises shortly without the need for powering off and resuming.
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BMW_Fan2020
Moderator
Posts: 173
Joined: Wed Jan 01, 2020 2:15 pm

It appears to be related to the vacuum system; diagnostics will be necessary using a proficient instrument, preferably ISTA, or alternatively, a reliable handheld device equipped with BMW software.What is your location?
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David_Smith2003
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Posts: 140
Joined: Fri Mar 03, 2023 7:45 pm

Medway, Kent, United Kingdom
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David_Smith2003
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Posts: 140
Joined: Fri Mar 03, 2023 7:45 pm

;)
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