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      07-11-2017, 09:51 PM   #1
westcoast1er
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JB4+P3 Gauge = CEL and Engine Malfunction?

Hello,

Just installed a P3 vent gauge to my N55 135i. It is stock other than a JB4. When driving home the car would not boost over 1-2psi and eventually threw an "engine malfunction" warning on the iDrive system. I turned the car off and then on and these codes came up on the P3:
2dd6
2dd8
2c90
318d
2c57

Any ideas? From my reading it seems the P3 just interferes with my JB4 and that may the cause. If it is, I have a P3 for sale!
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      07-16-2017, 07:58 AM   #2
Mike@N54Tuning.com
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They will fight over CANbus bandwidth so you have to run the P3 in boost only mode with no CANbus to use it with a JB4.

Mike
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      07-16-2017, 12:09 PM   #3
f87CSdrifterential
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I found out in a similar fashion that the 2 are not compatible, though mine would only sweet the gauges, reseting itself, while I was driving. No boost or CEL issues. Mike is right, the 2 fight for Canbus info and prevent each other from doing their jobs.
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      07-17-2017, 12:56 PM   #4
westcoast1er
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I figured as much after doing a bit of digging. Thanks for the confirmations though.
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