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Thread: 2.0t turbo fault code P0034

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    Default 2.0t turbo fault code P0034

    hi, can anyone tell me the likley cause of fault code P0034
    turbo charger bypass valve control circuit low.

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    Full Member KitS's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 2.0 T

    Year : 2004

    Mileage : 134000

    Default

    No replies after 9 years doesn't bode too well for my question......

    My Signum 2.0T Design has exactly this problem too. During a longish trip the engine hiccupped and various lights came on and then went off again, and afterwards the car was notably down on power, none of the usual 'zing' at all. I took it to my local garage guy, not a VM dealer, and his diagnostic box coughed up the same 'fault code P0034 turbo charger bypass valve control circuit low' fault.

    When we checked the bits under the bonnet the vacuum operated valve to the left of the turbo, looking from the front, didn't seem to operate at any throttle setting, but it did operate, pushing outwards, when subjected to a separate vacuum supply. There's some sort of electrical device (solenoid?) outboard of the vacuum valve, but as this is a SAAB engine none of his Vauxhall docs seem to have any info on it.

    There's no smoke from the exhaust and it runs OK, but just like a non-turbo'd 2.0 engine.

    Does anyone have any clues to what the problem might be please?

  3. #3
    VIP-Member GSiFan's Avatar
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    Vehicle : Vectra GSi 3.2 V6

    Trim : GSi

    Engine : Z32SE

    Year : 2003

    Mileage : 220,240

    Default

    I am not familiar with the Z20NET. It sounds like the vacuum servo you mentioned is not operating. The solenoid that sends vacuum to the unit might not be operating. It may have failed or there could be a wiring fault. Or a blocked vacuum pipe. You have to start somewhere.

    Hopefully one one of the Z20NET experts will be along. @Caveman_nige?

    Paul
    2003 Vauxhall Vectra GSi 3.2 V6

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    Regular Member Sindy's Avatar
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    Vehicle : Signum

    Trim : Mohican

    Engine : Z20NET

    Year : 2006

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    There's 2 of them on the Z20NET - General consensus is to replace both of the boost solenoids at the same time, belt and braces. They're about £20 each.

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    Full Member KitS's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 2.0 T

    Year : 2004

    Mileage : 134000

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    Ah, great, thanks for that.

    Where's the other one please? I can see one of them mounted to the left of the vacuum cylinder, looking from the front of the car, but I can't see another one. I'll post a pic later on today to show what I mean.

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    Regular Member Sindy's Avatar
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    Vehicle : Signum

    Trim : Mohican

    Engine : Z20NET

    Year : 2006

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    Not done mine yet but from memory there's one near the TB and one near the turbo wastegate.

  7. #7
    Full Member KitS's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 2.0 T

    Year : 2004

    Mileage : 134000

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    Thanks, my garage man will have a look at it tomorrow.

    My days of digging down behind sideways engines are long past.

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    Full Member KitS's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 2.0 T

    Year : 2004

    Mileage : 134000

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    Here's a pic of the bits I THINK are the problem.....


  9. #9
    Regular Member Sindy's Avatar
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    Vehicle : Signum

    Trim : Mohican

    Engine : Z20NET

    Year : 2006

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    Yep, one of the solenoids is there, the other is at the front of the engine on the left of the inlet hose.

    There's also a diaphragm in the charge air bypass valve which is bolted to the turbo which can split and cause all sorts of running issues if neither of these clear the issue.

    There was a thread on here that had the part numbers for both valves in somewhere, just be careful not to mix them up as they look the same but are different.

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    Regular Member Sindy's Avatar
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    Vehicle : Signum

    Trim : Mohican

    Engine : Z20NET

    Year : 2006

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    Found it - links to other threads in it with part numbers.

    https://www.vectra-c.com/forum/showt...-2-0T-No-Boost

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