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rberg89 rberg89 is offline
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Car: 2011 BMW 335i xdrive
Default Going in to limp mode consistently at idle after 20 minutes of driving - 06-08-2019, 12:19 PM


I have a 2011 335i xdrive with an N55. The mods are JB4 and BMS chargepipe. I run 93 octane. I had been running it in Map 5 until the problem happened and since reproduced the problem in Maps 0, 1, and 2.

I drive for a while and then when I am sitting at a stoplight or otherwise just idling, it goes into limp mode. I read the codes using JB4 and they are as follows:


I can clear the codes, but limp mode does not go away. I have to clear them and then disconnect the battery to clear limp mode. The problem reliably comes back after driving for maybe 20 minutes, often when idling.

Today I used electrical contact cleaner on all JB4 connectors, corresponding piggyback connectors, and sensor plugs, and ensured snug connection, but the issue still happened. When I installed the JB4, I soldered the JB4 wires to the CANbus pairs so I don't believe the issue is there. The ground is firmly connected where the guide specifies.

I have no idea what is wrong or what to do . The vehicle seems to run great when it is not in limp mode.

Last edited by rberg89; 06-08-2019 at 02:02 PM..
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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
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Default 06-08-2019, 06:19 PM

VANOS faults.. Maybe replace the solenoids and if not that check for sheered bolts.

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keyap keyap is offline
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Car: N55 135i
Default 06-09-2019, 03:11 PM

This may help:

need help with some codes please - N54Tech.com - International Turbo Racing Discussion

UK 2011 - E82- 135i - N55 - DCT

JB4 | BMS OCC | N20 TMap | Fuel-It! PI | AIC6 PI Controller | Fuel-It! Fuel Lines | Fuel-It! Stage 2 LPFP | Continental In-line E Sensor | ER Charge Pipe | Pure Stage 2 Turbo | Pure High Flow Inlet | GFB DV+ | Richter C'less D/Pipe | Berk Race Full Exhaust | MFactory Pro Helical LSD (75% Bias Ratio) | eDiff Disabled Via Coding | MFactory Solid Diff Bushes | Diff Lockdown Bracket | Custom 98G0B BEF | NGK 5992s (0.020")
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rberg89 rberg89 is offline
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Car: 2011 BMW 335i xdrive
Default 06-21-2019, 05:06 PM

Hi guys,

Sorry for the late reply. I removed and cleaned both VANOS solenoids today, with brake cleaner and electronic parts cleaner. I tested them with a 9V battery and they both actuate when I apply the battery and retract when I open the circuit.

I also cleaned the VANOS solenoid electrical contacts/connector contacts with electronic parts cleaner. After about 20 minutes of driving, the CEL came back, throwing the same three codes as above.

I am wondering if I should buy new solenoids and replace, although I am wondering if the solenoids are not the problem. I did call BMW and they say there are no outstanding recalls on my vehicle.

Edit: it is worth mentioning that the code will sometimes clear itself. When I turn the car on in the morning, I may find that the CEL has gone away, and will reappear perhaps on the drive home.

Last edited by rberg89; 06-21-2019 at 05:27 PM..
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