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Thread: 2.0 tdi p0651

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  1. 2.0 tdi p0651 
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    I've just picked this car up as a non runner, the battery was flat and they said the DPF light, engine light and glow plug were flashing.

    I've scanned the DPF and it's at 46.25g so I'm hoping to do a forced regen.

    I've tried to jump start but it turns over and doesn't fire.

    Scanning I get the following codes:

    P0651 - Sensor reference voltage B - circuit open

    P0562 - System Voltage Low

    P2463 - DPF restriction - Soot accumulation. ( as expected)


    I've tried disconnecting the sensor on the top of the EGR, the DPF pressure sensor and the sensor on the throttle body.

    Any further suggestions to get it to fire? I don't want to kill a brand new battery turning it over repeatedly.



     
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  2. Re: 2.0 tdi p0651 
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    That wonít regen, it needs to come off and be professionally cleaned, we use DPF Clean Team.
    "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: 2.0 tdi p0651 
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    Thanks, would that explain why it's not starting though?
     
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  4. Re: 2.0 tdi p0651 
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    No, on that engine we get a lot of trouble with clogged inlet manifold flaps, these can also cause a misfire like stuttering idle.
    "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: 2.0 tdi p0651 
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    I got the battery fully charged over the last couple of days. It started ok this morning but still in limp mode. I'll get it checked shortly.
     
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  6. Re: 2.0 tdi p0651 
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    Thanks for that, I've got it started, it just needed a full charge of the battery.

    I tracked down P0651 - Sensor reference voltage B - circuit open; to be the boost/control pressure sensor which i've now replaced.

    It's now starting ok, but still has the same warning lights and is still in limp mode. Clearing and rescanning the codes now gives me:


    P2564 - Turbocharger Boost Control Position Sensor Circuit: Signal too Low

    P2463 - DPF restriction - Soot accumulation. ( as expected)
     
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  7. Re: 2.0 tdi p0651 
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    Tracked the last sensor fault down to one I’d unplugged while diagnosing.

    Last code is the dpf. Limp mode still but without the rev restriction.
     
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  8. Re: 2.0 tdi p0651 
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    What are the soot and Ash mass loading values?
    "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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