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04-01-2017, 08:12 AM | #1 |
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JB4 Harness Issue? (CEL/Codes)
I'm trying to figure out what's randomly making my car throw CEL and codes.
Problem mostly happens with Map5. Is there a way to test the harness to make sure it's not damaged and working properly? I've had this issue since I purchased the JB4 a month ago. Codes: 2C58 2C6F 281A 281B (I sometimes get this code in addition to the 3 above) The problem appears to come and go when it wants to. I can start the car, not get a CEL and drive fine. Other times I start up the car, get the CEL and reduced power. |
04-03-2017, 09:56 AM | #2 |
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2C58 is charge-air pressure control (monitors the DME's de-activation of active boost)
2C6F is boost pressure sensor (monitors the wire to the boost pressure sensor) 281A is absolute pressure sensor (monitors the intake-manifold pressure sensor's upper voltage limit) 281B is absolute pressure sensor (monitors the intake-manifold pressure sensor's lower voltage limit) Have you checked all your connectors on the install? I would try the easy things first, re-seat all connectors and check for possible damage (rub through, melting, critter-chew, etc...). Definitely sounds boost related. Are you a harness A or B JB4? Was the JB4 purchased brand new or used?
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2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes
2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts 2007 Suzuki GSX-R 750 - too much to list |
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04-03-2017, 09:26 PM | #3 | |
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Quote:
If a pin in a plug isn't seated properly, would that cause this issue? I also have a strange electrical sound which is turned off/on by menu 4/5 (flap) toggle |
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04-04-2017, 10:45 AM | #4 |
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Next steps might be contacting BMS directly, they've got pretty good support from what I hear.
If you hook up the stock connectors, do you still receive the codes? I'm thinking its something with that boost solenoid connector, perhaps a pin not seated properly.
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2011 BMW 135i M Sport Space Grey - BMS JB4, VRSF 3.5" catless DP, Berk exhaust, BMS intake, ER CP, Eibach Pro-Kit, H&R spacers, black kidneys, Blacklines, LUX angel eyes
2014 BMW X5 xDrive 35d M Sport Mineral White - MPBK w/ F85 rotors & Carbotech pads, ACS Springs/Links, iND reflector deletes, iND black roundels, MP black kidneys, M50D grille inserts 2007 Suzuki GSX-R 750 - too much to list |
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04-04-2017, 10:51 AM | #5 |
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I've made the same thread at N54 in the support section. No help yet.
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04-04-2017, 11:34 AM | #6 |
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Email Terry directly.
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04-05-2017, 01:27 PM | #7 |
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Chiming in here:
I had the same exact codes. Turned out to be the wiring for the JB4 connect kit. Assuming you also have the connect kit, there's a wire going to it that expects 5v and is getting 12v (or vice versa!) Here's what fixed it for me: http://www.n54tech.com/forums/showthread.php?t=43267 Switched the wires, all codes went away instantly. |
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04-05-2017, 05:59 PM | #8 | |
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Maybe this will explain the strange electrical noise I randomly get that seems related to the CANflap and/or wastegate position. |
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