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Audi A6 C5 1.9 TDI AJM - Error Code P1556: Charge Pressure Control Negative Deviation Solutions

PiterG60 17610 9
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  • #1 16491722
    PiterG60
    Level 7  
    Hello everyone, I know that there are many topics with this error code, but none of them helped me.
    The car enters sporadically (once a week, and sometimes twice a day into emergency mode)
    After reading, always the same error: 17964 - Charge Pressure Control: Negative Deviation P1556 - 35-10
    In short, I have done so far:
    - I checked all the negative pressure - OK
    - I checked the entire flight - OK
    - I cleaned the turbine - Ok
    - I replaced the N75
    I will add that the car normally starts and pushes into the seat as it does not go in safe mode.

    Unfortunately, dynamic logs cannot be created (the laptop is already stationary)
    I am asking for advice and suggestions.
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  • #2 16497181
    PiterG60
    Level 7  
    Hello, nobody has any ideas.
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  • #3 16499037
    sebap
    Level 41  
    100% efficient flow meter?
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  • #4 16500571
    PiterG60
    Level 7  
    Effective flow, I changed n75 once again and for now choose everything. I'll leave the vehicle for a few days and let you know.
    I hope this was the reason.
    I note that the n75 was new and may turn out to be defective.
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  • #5 16531657
    colin
    Level 11  
    sometimes the turbo cleaning doesn't help anymore and only regeneration
  • #6 16531716
    gsisoprano
    Level 15  
    17964 P1556 Possible causes:

    Hose connections reversed
    The hose connection (s) is leaking
    Intercooler hose
    Leaking vacuum lines
    Solenoid valve for regulating the charging pressure (N75) defective
    Turbo dirty or damaged. Especially when the variable blade adjustment mechanism will not leave you a fault If the variable blade in a position where a flexible stinging small pulse comes
    If present: the power box gives the wrong signal to influence the boost pressure
  • #7 16532224
    adam7009

    Level 41  
    The turbine itself has no efficiency, apart from the modified soft
  • #8 16532668
    PiterG60
    Level 7  
    Hello, subject under control.
    The plastic suction hose was guilty which flies along the bulkhead wall to n75.
    Rubbed, the needlehole.
    And by the way I cleaned the variable geometry again and now I enjoy riding for a week.
    Thank you so much for help.
  • #9 16532749
    adam7009

    Level 41  
    PiterG60 wrote:
    - I checked all the negative pressure - OK

    so I just wrote that I checked yes? because, however.
  • #10 16533876
    PiterG60
    Level 7  
    I checked all the rubber hoses, who would think that it would wipe the plastic one.

Topic summary

The discussion revolves around the error code P1556 (Charge Pressure Control: Negative Deviation) encountered in an Audi A6 C5 1.9 TDI AJM. The user reports sporadic emergency mode activation despite performing several checks and replacements, including inspecting negative pressure, cleaning the turbo, and replacing the N75 valve. Responses suggest potential causes such as a defective flow meter, reversed or leaking hose connections, and issues with the turbocharger's variable geometry. Ultimately, the user identifies a worn plastic suction hose as the culprit, which was causing a vacuum leak, and notes improved performance after cleaning the variable geometry and replacing the hose.
Summary generated by the language model.
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