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Thread: 2.0DTI Engine Fault - Limp Home Mode Over 3000 RPM

  1. #1
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    confused 2.0DTI Engine Fault - Limp Home Mode Over 3000 RPM

    Hi Guys,



    I have a problem with my 52Reg 2.0dti Vectra, for about a month now it has a lake of power & the fault light coming on at start-up and also if drive with revs over 3000 rpm in 3,4 or 5 gear.

    In 1st, 2nd & netural the car revs to 5000 rpm with no warning light coming on.


    After reading many threads about the EGR valve cleaning etc, I have taken the EGR valve off and cleaned the carbon build up (was about 2mm thick), have also checked all the hoses and cannot find any splits etc.

    Has anyone else got any idea's?

  2. #2
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

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    clean out the boost sensor with some carb cleaner.
    Driving vauxhall,s for 30 + years
    and still loving it

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    As above. If the clean doesn't work, replace it. A bit under £50 from a dealer.

    Also you say you have checked the hoses. Have you checked all 3 air hoses (the short one under the engine cover sometimes gets forgotten) AND the vacuum pipes (including the rubber connectors)? It's easily done to overlook one.

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    Regular Member addyboy1982's Avatar
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    As above mate, my old DTI did the same then something blew under the bonnet. It was the short hose under the enfine cover that had worked loose and come off. Re-fitted and all was good as new.

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    Hi, Took the boost sensor off yesterday and cleaned, rec-hecked hoses and found small pipe from near the radiator off (split connector), thought Euuureekkkaaa I found the problem but after a test drive my eurka moment was killed.. still the same.. limp home home in high gears at 3000 RPM.
    Read another post and they had simualr problems with the boost solenoid, Haynes manual call it the wastegate solenoid, am thinking it maybe that I may try the brake / accelerator fauld code trick to see if I can get the excact error code.
    Any other idea's?

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    Quote Originally Posted by coxstevuk1973 View Post
    Hi, Took the boost sensor off yesterday and cleaned, rec-hecked hoses and found small pipe from near the radiator off (split connector), thought Euuureekkkaaa I found the problem but after a test drive my eurka moment was killed.. still the same.. limp home home in high gears at 3000 RPM.
    Read another post and they had simualr problems with the boost solenoid, Haynes manual call it the wastegate solenoid, am thinking it maybe that I may try the brake / accelerator fauld code trick to see if I can get the excact error code.
    Any other idea's?
    The flashing engine light thing doesn't work on DTi's - it's got to be a fault code reader, and the DTi is very choosy about what it'll talk to.

    Certainly check all of the acutators (solenoids) that your car has (2 or 3) make sure they are allowing a vacuum through under the right conditions.

    Also check that the valves themselves operate move smoothly throughout their range of movement. I did this by disconnecting the pipes that connect the acutators to the valves at the acutator end and sucking through the pipe to manually move the valves. Also check there's no leaks in the pipes or the valves themselves by sucking then putting your tongue over the end of the pipe and making sure the valves don't creep back. Don't get dribble in the pipes and be sure to re-connect them properly afterwards.

    If the acutators and valves seem OK and you have checked all air hoses and vacuum pipes, I'd either get the fault code read (let us know the code number if you do) or perhaps try my luck by replacing the boost pressure sensor (as a clean-up doesn't always fix it). The sensor is nearly £50 so which way you go may depend on how much it will cost you to get the fault code read.

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    Did try the code trick and yes you are right, it does not work..

    Have again checked the hoses and cannot see any splits, although I have heard that a pin hole size hole can cause problems.

    Now waiting for the weather to warm up so I can check the solenoids and have a closer look.

    Have notices an electrical conector off near the inlet manifold switchover solenoid (near the rad), although I cannot see any connectors off, not sure if its a spare of the loom.

    Have been looking on ebay for a code reader, looking at a ELM 327 but still trying to find out if that will read the codes, don't really want to spend money on parts that maybe are OK.

    Need to sort it out soon, the lake of power & fault is really doing my head in

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    Hi, now read the code and it comes up with the following error.

    P0234 - Boost Pressure Control Circuit Positive Deviation

    Any idea what the lickly causes are?

  9. #9
    Full Member bobssignum's Avatar
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    Vehicle : Signum 2.0 DTi

    Trim : Elegance/Elite

    Engine : 2.0DTi

    Year : 2003

    Mileage : 73350

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    po234 is refering back to your boost pressure sensor with positive deviation meaning it is over boosting , so i would say clean the boost sensor along with the manifold it sits along with the egr
    Driving vauxhall,s for 30 + years
    and still loving it

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    i have same syptoms and codes replaced egr etc then had vacume tests and electrical tests came back ok he said it looks like a sticking turbo and to put additives in diesel have done and its gone ten times worse limp mode 6 times on a half hour drive it only used to happen now and again i have been told there is a ecu update available to overcome this p0234 bu when i contacted vauxhall they wouldnt tell me they said pay 100 to read codes when i already have the code. having more high presure tests done to make sure it is the turbo coz like you it works fine in low gears see if you can get someone to update ur ecu this solves some p0234 problems bin told to sensors are to sensative vauxhall are very reluctant to do this im going to try another dealers near me next week keep us updated

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