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Thread: Fault Code P0638

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    Default Fault Code P0638

    Vectra C estate 2003 2.0 dti.

    When motorway driving I keep getting the spannner light showing. This only happens when I need to slightly accelerate to negotiate an incline or overtake. Engine doesn't go into limp mode and turning off then on the ignition clears the light.

    I have had the fault code read and below is listed the results.

    P0638 Throttle Present
    ( 5A ) Control circuit
    Negative
    Deviation.

    After researching on this forum I have removed and thoroughly cleaned out the Throttle Butterfly Assembly.

    I have replaced ALL the vacuum pipes with silicone piping and checked the boost pipes for splits.

    However the problem remains.

    Does anyone have any suggestions as to what to look for next?
    Many thanks in advance.

    Sorry for the triple post , my computer was playing up yesterday and didn't realise that these had been posted ok , perhaps a mod could delete the other posts, many thanks.
    Last edited by Micknal; 10th November 2011 at 15:25. Reason: Triple post

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