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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Jb4 problem



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      05-15-2013, 10:19 PM   #1
Carlos335i
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Jb4 problem

I've been having this issue for quite some time now. One day I was driving with my jb4 on in map 2 and it just stopped working. It would not go into menu and the boost gague went away. So I uninstalled it then installed it again. And boom. My car does not boost at all. In any map. The boost gague does not work and after a while the car goes into limp mode. So I got home and uninstalled it. And my car is running fine and strong. I let it sit in the garage for a month then decided to install it again. Same problem.car works fine without jb4 but with it it does not boost and goes into limp mode?? Bad jb4? Please help
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      05-16-2013, 11:24 AM   #2
Mike@N54Tuning.com
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Quote:
Originally Posted by Carlos335i View Post
I've been having this issue for quite some time now. One day I was driving with my jb4 on in map 2 and it just stopped working. It would not go into menu and the boost gague went away. So I uninstalled it then installed it again. And boom. My car does not boost at all. In any map. The boost gague does not work and after a while the car goes into limp mode. So I got home and uninstalled it. And my car is running fine and strong. I let it sit in the garage for a month then decided to install it again. Same problem.car works fine without jb4 but with it it does not boost and goes into limp mode?? Bad jb4? Please help
The JB4 will disable itself if it detects a hardware issue on the circuit board. Another possible cause is a wire being loose, CAN wires not making a good contact, etc. Best to get with BMS for troubleshooting.

Mike
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