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Thread: VW golf mk5 starting problems

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  1. VW golf mk5 starting problems 
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    Hi! My Vw golf mk5 gt too 2.0 has been having a random starting problem. Some times It will start fine & other times will turn over fine but not fire up, the weird thing when it doesn’t start is the fan starts going on a turn of the key from cold start. Any ideas will be much appreciated. Kind regards Neil
     
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  2. Re: VW golf mk5 starting problems 
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    A Diesel then?...
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  3. Re: VW golf mk5 starting problems 
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    Hi Crasher! Yes a diesel, BKD engine.
    Regards Neil
     
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  4. Re: VW golf mk5 starting problems 
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    That symptom suggests the ignition switch is faulty or possibly what is known as the Line 15 relay. The fan controller (in the big fan) is seeing the engine as running but is not receiving the temperature signal so it assumes the engine is overheating and goes into full bore cooling mode, it's very irritating when you are trying to do diagnostics so I full the fuse to shut them up. Firstly, start with a full VAG group specific code read,print and full clear. Then use it again until the problem re-occurs and then get another code read done, then you can look at the two scans and compare what has happened.
    Last edited by Crasher; 23-05-2020 at 12:39 PM. Reason: Grammatical errors
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  5. Re: VW golf mk5 starting problems 
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    Sorry to Crasher to bother you. Where exactly on t bad engine is this line 15 relay just so I can swap & test. Thanks again for all your help.
     
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  6. Re: VW golf mk5 starting problems 
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    The BAD is an FSI petrol engine, do you mean BKD? If so, the line 15 relay is on the central electrics front face at position KL15 position with the “control group” number 460 printed on top, VAG part number 1K0 951 253 A BUT it could also be the relay power or command feeds at fault. Bridging the 30/85 sockets on the board mimics the relays output function.
    "I disapprove of what you say, but I will defend to the death your right to say it"

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