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[Solved] Man E6 440 2014 - EDC Errors 45467 and NONOX 5556 after Adblue System Cleaning

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  • #1 17105462
    szyniu
    Level 20  
    Posts: 587
    Help: 10
    Rate: 329
    Hello, I have the following problem, the car is Man E6 440 2014
    edc errors 45467
    NONOX 5556
    The toy car came to me and I did not know its history, fresh purchase of the owner, there were many errors but none was active, the inlet to the crystallized adblue category was clogged up, I disassembled and cleaned everything, cleaned the spray tip, after these initial repairs I recommended observation and possibly let me know how something would happen. On the third day I got a call that messages appeared, these errors above, please ask colleagues on this topic.
    Thanks in advance.
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  • #2 17105935
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1696
    NOx 5556; return line blocked. As for the EDC error, you probably read it incorrectly, check again. I can guess that this is a 4467 error which would mean a sudden change in temperature in the AdBlue tank but I can be wrong.
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  • #3 17107339
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    Enter the error again edc.
    The injector we replace, nothing gives a wash, not euro 5.
    If you replace the injector and the errors continue, you will need to replace the return hose with a larger diameter.
    Greetings
  • #4 17136908
    szyniu
    Level 20  
    Posts: 587
    Help: 10
    Rate: 329
    Return to the topic of the car returns tomorrow from the route after two weeks so I will plug in the computer and personally check what is going on there, errors were given to me by the driver from the board, I actually turned something in this error in edc tomorrow I will decide.
    I will only add that the error is displayed as the load is greater than 15 tons when the load is less, the problem does not occur.
    I will write more details tomorrow.
  • #5 17289915
    telekawa
    Level 7  
    Posts: 5
    Rate: 9
    Hello, I have exactly the same symptoms as you dealt with this topic?
    Initially I have deleted the error, nothing was done and I'm afraid that the error will return
    The computer also read it as a blocked return line, please help !!
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  • #6 17290327
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    If you have the same symptoms - the solution is written above.
  • #7 17290465
    mariomalinie
    Level 19  
    Posts: 201
    Help: 32
    Rate: 166
    telekawa wrote:

    The computer also read it as a blocked return line, please help !!


    Return hose to be replaced. The original is too small in diameter. To buy at MAN complete with all tips. The cost is about 500 PLN
  • #8 17298308
    telekawa
    Level 7  
    Posts: 5
    Rate: 9
    Welcome back.
    We changed the cable to the thicker one, but the error returned. Could it be because I deleted the error in Germany and flew to Pl. We passed without additional deleting
    Error 5556
  • #9 17298487
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    I will tell you honestly that I do not understand your question - you replaced the cable and deleted the error in Germany - or whatever .... lead me to the right way of thinking.
    Replace cable, reset errors.
    This error can also be displayed when the injector is clogged but a preview of the parameters on the computer will explain everything.


    To solve the topic.
    Sooner or later, he will speak to you.
    If Man recommends a replacement, it will warrant this error.
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  • #10 17299096
    telekawa
    Level 7  
    Posts: 5
    Rate: 9
    Exactly.
    Error erased 400km later repair.
  • #11 17414312
    szyniu
    Level 20  
    Posts: 587
    Help: 10
    Rate: 329
    Gentlemen, I come back to the topic after a long break to write what and how with my MAN problem has been solved thorough cleaning of urea hoses helped once more when the nozzle was pushed but again I cleaned and for now calm, maybe a matter of time when I will clean something again but yes or not otherwise the problem was the Adblue line patency, I will only add that I did not change the return line to the larger diameter.
  • #12 17414316
    szyniu
    Level 20  
    Posts: 587
    Help: 10
    Rate: 329
    Gentlemen, I come back to the topic after a long break to write what and how with my MAN problem has been solved thorough cleaning of urea hoses helped once more when the nozzle was pushed but again I cleaned and for now calm, maybe a matter of time when I will clean something again but yes or not otherwise the problem was the Adblue line patency, I will only add that I did not change the return line to the larger diameter.

    Added after 37 [seconds]:

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Topic summary

✨ The discussion revolves around a MAN E6 440 truck from 2014 experiencing EDC errors 45467 and NONOX 5556 after an AdBlue system cleaning. The user initially cleaned the AdBlue components, including the spray tip, but errors reappeared after a few days. Responses suggest that the NONOX 5556 error may indicate a blocked return line, and the EDC error could relate to a temperature change in the AdBlue tank. Recommendations include replacing the return hose with a larger diameter version and ensuring the injector is functioning properly. The user later reported that thorough cleaning of the urea hoses resolved the issue temporarily, although the return line was not replaced.
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FAQ

TL;DR: For MAN Euro 6 2014 (440), NOx 5556 often traces to a restricted AdBlue return; the fix kit costs about 500 PLN, and “Return hose to be replaced.” Replace/clean, then clear faults. This FAQ helps owner‑operators diagnose EDC/NOx after AdBlue cleaning. [Elektroda, mariomalinie, post #17290465] Why it matters: Solving the root cause prevents derates, fines, and repeat roadside resets.

Quick Facts

What does NOx 5556 mean on a MAN Euro 6?

It points to a blocked or restricted AdBlue return line. Investigate for crystallization or a constricted hose, then repair accordingly. [Elektroda, darfur5, post #17105935]

How do I fix NOx 5556 after AdBlue system cleaning?

Replace the return hose if restricted, then reset faults. If the injector is clogged, address it after checking live parameters.
  1. Replace the return hose/cable.
  2. Reset errors with a diagnostic tool.
  3. Check injector parameters; replace if clogged. [Elektroda, kakibara, post #17298487]

Do I need to clear codes after replacing the return hose?

Yes. After replacing the hose, clear the fault memory with a diagnostic tool to complete the repair and restore dosing. [Elektroda, kakibara, post #17298487]

Why does the fault appear only when the truck is heavily loaded?

Drivers reported the fault shows up above 15 tons but not when lighter. Use that condition to reproduce and diagnose. [Elektroda, szyniu, post #17136908]

Is a larger‑diameter return hose necessary to solve 5556?

If errors continue after injector replacement, fit a larger‑diameter return hose as the next step in the repair. [Elektroda, kakibara, post #17107339]

How much is the MAN return hose kit and what do you get?

Approx. 500 PLN from MAN buys a complete return hose kit with the correct tips for a straightforward swap. [Elektroda, mariomalinie, post #17290465]

Will clearing the code without repairing anything work?

No. One driver cleared the code, drove about 400 km, and still needed the repair afterward. Fix the cause first. [Elektroda, telekawa, post #17299096]

Can cleaning alone fix NOx 5556 on a MAN E6?

Yes, if blockage is due to AdBlue crystals. Thoroughly cleaning urea hoses and the nozzle restored patency in one case. [Elektroda, szyniu, post #17414312]

Does injector washing help on Euro 6 dosing systems?

No. Replace the dosing injector if it is clogged. Washing does not resolve this on Euro 6 systems. [Elektroda, kakibara, post #17107339]

I replaced the return hose and 5556 came back—what next?

Check injector health and live dosing parameters. “This error can also be displayed when the injector is clogged.” Replace if needed. [Elektroda, kakibara, post #17298487]

I read EDC 45467—could it be 4467 instead?

Verify with a proper scanner. One post links EDC 4467 to a sudden temperature change in the AdBlue tank. [Elektroda, darfur5, post #17105935]

Which tool confirms a “return line blocked” message?

Use a diagnostic computer to read and describe the fault. Users reported scanners flagging the return line as blocked. [Elektroda, telekawa, post #17289915]
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