N55 blow off valve

image This is a good one,,,we don’t see this to often,,,,F10 2012 N55 engine,,,,check engine light came on 1 time only,,,,fault was turbo over boost,,,,happen at 2600 rpms,,,,,we already replaced the electric pressure control valve which sits next to the valve cover,,,,I performed the turbo boost test,,,,passed test,,,,I smoke tested the turbo and intake system,,,no leak,,,,if there was a leak I would have a low boost fault.image I checked the wastewater,,,waste gate is vacuum controlled,,,I checked the waste gate with a vacuum pump,,,,,waste gate working ok,,,,this picture is the electronic blow off valve,,,,we were thinking the blow off valve was hanging up,,,causing the over boost fault.image Replacing the blow off valve wasn’t to hard,,,,you just remove the water pump and you have easy access to the blow off valve,,,,just 3 Allen head bolt hold it into place.,,,,this took care of the problem.

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7 Responses to N55 blow off valve

  1. Faizel Latief says:

    I have a 2010 F10 535i (N55) and it came up with Drivertrain warning and went into limp mode. This happens almost every time and not necessarily under heavy acceleration…even when cruising.
    BMW ran diagnostics and kept getting these errors:
    “Charging pressure control, plausibility Pressure too high”
    “Charging pressure control: Switch-off as consequence”
    They couldn’t pinpoint the fault and ended up replacing spark-plugs and coils. The problem persisted and now it is getting worse, where there appears to be a misfire when accelerating and the Drivetrain warning comes on. These are the messages they see now:
    “Intake air temperature sensor, electrical: Short circuit to B+”
    “Charging pressure control, plausibility Pressure too high”
    “Charging pressure control: Switch-off as consequence”
    “Blow-off valve: Jammed closed”
    “Super-knocking, cylinder 6: Injection switch-off”
    Any ideas?
    Kind regards,


    • It looks like you have a couple of problems,,,,the charge pressure issue is probably caused by the electronic boost control valve it sit on the passenger side next to the valve cover,,,,it has 2 vacuum line going to it and a electrical plug,,,,also make sure the vacuum lines are ok,,,,,the knock on cylinder 6 and intake sensor sounds like new faults after they did the repairs,,,,,start with the electronic boost control valve and see what happens.


    • Make sure the intake sensor and cylinder 6 coil and injector are plugged in


    • Angel Guzman says:

      I have the same problem, did you find out what it was?


  2. Jamaal says:

    Hi there, I’m new to this page but would you be able to post a picture to show me where my turbo boost control valve is. I’m getting the drivetrain malfunction light and no boost.

    2012 f10 535i


    • Sorry I don’t have any pictures available ,,,it is located on the passengers side next to the valve cover,,,,,there should be a 2 vacuum hoses going to it and 1 electrical connector,,,1 of the vacuum hoses comes straight from the valve cover and straight to the valve.


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