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      03-05-2018, 01:48 PM   #1
hovik92
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Hey guys. I have a 2012 550i M-package. It has a JB4 beta on it, full 3” exhaust with an X-pipe, valves, and mufflers. Also it’s lowered on springs. So today I was driving home and doing about 25-30 mph. I was in drive and on a smooth road. All of a sudden, my car gave me the drivetrain malfunction (with no check engine light) and a DSC inactivated screen. After this, the car went into complete limp-home mode and wouldn’t go over 10 miles per hour or over 1200-1500 RPM. Luckily I was by my driveway and pulled in. I restarted the car and it was back to normal. I’ve now driven about 5 miles since restarting it and have not experienced the issue again. Has anyone experienced this or can shed any light on it?
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      03-05-2018, 01:59 PM   #2
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Could potentially be bad coils or plugs. Try to get a reader on there and see what kind of codes came up, possibly a misfire.
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      03-05-2018, 02:09 PM   #3
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That happened to me in my 550i last year. Turned out to be bad coils and plugs. I was running a RaceChip at the time and since I was under warranty I disconnected it and took it to the dealer where they found a few other things but it came down to the car needing a tune up.
Here's the list of things they found:
Vacuum hose leak
Coolant y pipe
Turbo coolant lines
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      03-05-2018, 02:12 PM   #4
hovik92
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My injectors, coils, and plugs were replaced 2 months ago. This one didn’t feel like a normal misfire. Just complete limp mode. I was told by others with the same issue it’s caused by the Code Clearing Option in the JB4 Beta. I’m gonna disable that and see if the issue persists.
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      03-08-2018, 06:41 PM   #5
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I had the same issue after installing my JB4 Beta. It would happen randomly, rarely when I was driving hard....cruising down the freeway at 65 and limp mode. I got so tired of it Ive gone to map 0 and almost given up on the JB4. Ill be replacing plugs soon and will try again but dont have a lot of faith. This F10 platform is not nearly as good as the E60 in my opinion. Very over-engineered!
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