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Thread: P0234 Fault resolved on 2.2 DTI

  1. #1
    Regular Member MrDerv's Avatar
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    Default P0234 Fault resolved on 2.2 DTI

    Afternoon all

    For those that keep getting P0234 fault, it's worth looking at the Boost control solenoid for answers, as i've just found the thing is adjustable!

    I've recently been getting limp mode with P0234 followed after diagnostic, so last weekend, i decided to fit a boost gauge. Boost was erratic, never smooth, and most of the time was showing 1.5Bar overboost before settling down to 1Bar a few seconds later. There's no splits in the hoses, and the vacuum pipes are all silicone replacements. Only leaves the turbo and the boost valve, and being lumpy, i decided to tackle the VNT mechanism on the turbo.

    After spending most of the afternoon trying to dis-assemble the turbo to try the Mr Muscle VNT cleaning method, i've found my turbo to be relatively clean (on a plus point, no play in the bearings ) and the VNT mechanism and arm moves fine without any resistance (checked while actuator rod disconnected). So i though, it can't be the turbo then

    Disconnected the boost control solenoid, took it apart and cleaned it. Noticed in the base there was a hex screw, so i tried seeing if there was any movement in it, and tightened it up. Re-fitted it and took it for a test drive, and had to drive it gently back home after the boost gauge was nearly whacking up to 2Bar with no sign of reducing. After some head scratching, i decided to unscrew the the hex screw back to where it was, and loosen it one full turn. Put it back together, and bam! 1Bar steady with 1.2Bar overboost

    Drives much better and boost comes on a lot smoother too! Done about 20 miles since and the boost readings are consistent

    I'll do a full write up if anyone wants to try it themselves!

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    yea write up sounds good and do you have a picture od where the boost solenoid is ive onnly had the car 2 weeks and trying to get my head round it all cheers

  3. #3
    North West Regional Organiser paulvectrac's Avatar
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

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    get it wacked up full chat mate lmao top job
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

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    Regular Member MrDerv's Avatar
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    Quote Originally Posted by paulvectrac View Post
    get it wacked up full chat mate lmao top job
    It holds back and throws P0234 if it goes anywhere near 1.5-2Bar when i've been test driving it. Would need a remap for higher boost

    I'll get some pics and do a write-up over the next few days

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    Regular Member MrDerv's Avatar
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    400 miles done since, booted it hard uphill in 5th and it didn't bat an eyelid! Powered on like a trooper, 1Bar pressure and no warnings

    Well happy now

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    Vehicle : 2.0t

    Trim : sri

    Engine : 2.0t

    Year : 2005

    Mileage : 161000

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    Hi mate.im getting the same on my 2.0 dti.can you post a how 2 or some pics.im sick as a pig with mine.boost sensor change as well hasnt worked.do you mean tge wastegate solenoid or the egr solenoid?ta

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    Regular Member MrDerv's Avatar
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    Sorry chaps, totally forgot about this thread, I'll get some pics up and a guide at the weekend (too dark to do it after work)

  8. #8
    Regular Member MrDerv's Avatar
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    Talking

    Right guys, here's a quick run-through. Apologies for the delay.

    Only attempt this if you have thoroughly checked ALL of the following:
    Vacuum lines for leaks and holes
    All turbo intake and intercooler pipework for splits and leaks
    VNT actuator rod movement (check that it moves freely and does not stick)

    Tools you will need:
    10mm Socket wrench or spanner
    HW5 Hex bit or T30 Torx bit
    Small flathead screwdriver
    Carburetor cleaner
    Soft cloth
    Cable ties

    Okeydoke, Here goes...

    The turbo actuator solenoid is located next to the battery cover
    1.jpg

    Undo the two 10mm nuts holding the solenoid to the bracket.
    2.jpg

    Disconnect the wiring plug from the solenoid, then remove the vacuum pipes. (refer to pic for refitting)
    3.jpg

    Spray the carb cleaner into either of the tubes for about 30 seconds, repeat on the other tube. At this point, refit the solenoid and roadtest. If there is no difference, next you need to take off the solenoid top. Use the small flathead screwdriver to gently push away the clips and very carefully remove the top to access the diaphagm (I say carefully as there's 2 springs inside that want to re-enact the Great Escape). Make a note of which order the innards are placed to aid re-assembly (i've seen some valves completely different to mine, so note how yours is assembled). Clean the diaphragm and small rubber pad with carb cleaner and a soft cloth. once cleaned, re-assemble and use the cable tie to squeeze the top clips in place if you've accidentally broken any. Re-fit and roadtest.
    4.jpg



    If this has not resolved your issue, I strongly recommend for the next step, a use of a Boost Gauge or Tech2/Vauxcom (or other) that can show turbo pressure readings.

    Ok, remove the solenoid again, and gently prize away the clips on the bottom cover to access the adjustment screw.
    5.jpg

    You will need either a HW5 hex, or a T30 Torx bit for the adjustment
    6.jpg

    With the cover removed, turn the screw half-turn anti-clockwise, re-assemble, refit, and roadtest. Repeat again until your boost reading reads a steady 1 Bar (14psi) with full throttle. Brief overboost to 1.2 bar is acceptable as long as it drops back to 1 Bar with full throttle.
    7.jpg



    Once it's sorted, have yourself a Beer, and relax.

    I hope this helps you guys!

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    thanx mate!!! I have the same problem i will do and see the results!!!

  11. #10
    Regular Member peadar's Avatar
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    Vehicle : ELITE

    Trim : FULL LEATHER

    Engine : 1.9 CDTI 150 BHP

    Year : 2004

    Mileage : 87,000

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    How did you fare out with this now its been done a while

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