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Man TGX 480 Euro 6: Adblue System Failure, Error Codes EDC 204547-02, SCR 505022-01 & More

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Why is an AdBlue system failure appearing on a MAN TGX 480 Euro 6 with faults EDC 204547-02, SCR 505022-01 and SCR 505556-10, and is there a risk of power limitation?

Yes — the EDC 204547-02 fault indicates that AdBlue dosing has been interrupted, and if creep mode is activated the truck can be limited to about 20 km/h [#17430165] The SCR 505556-10 code points to a blocked NONOX return line, and 505022-01 means the NONOX supply voltage is too high [#17429277] To find the cause, check the return line size/blockage, NONOX voltage, pump/module number, air test pressure, air efficiency, dosed quantity, working pressure, and injector operation [#17429572] [#17430213] One reply also notes that excessive AdBlue/urea contamination or overfilling above 100% can block dosing [#17430213] After the repair, run the proper tests, reset the system, and verify it with OBD [#17430213] On some MANs the fix may involve rinsing the module, but older modules can still require pump plus cable replacement, especially if AdBlue has crystallized or the tank was topped up in small amounts too often [#17440837] [#17441220]
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  • #1 17429226
    Transap
    Level 6  
    Posts: 6
    Rate: 13
    I need help - the message Adblue system failure appears in the car and the following active errors:

    EDC 2 04547-02
    SCR 505022-01
    SCR 505556-10
    and TCU 4x but passive

    That's it, there's nothing else at the moment.
    I also have a question, is there a risk of power limitation in the above-mentioned case?
    Thank you
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  • #2 17429277
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1695
    SCR 505556-10; return line blocked (NONOX). 505022 - 01; supply voltage too high (NONOX).
    As for the EDC error, I did not find such a code in this driver. In Mana, you are unlikely to have a power limit.
  • #3 17429369
    Transap
    Level 6  
    Posts: 6
    Rate: 13
    So I will check the edc error code again, if I have not pasted any error rewriting.
    Any tips on where to start when solving this problem?
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  • Helpful post
    #4 17429572
    darfur5
    Level 35  
    Posts: 2110
    Help: 266
    Rate: 1695
    Replace the return line with a larger diameter (available), measure the voltage on NONOX. It's best to see a mechanic who understands this. As for the EDC error, it can report bad exhaust gas composition (NONOX doesn't work for you).
  • #5 17430165
    MAN Electronics
    VIP Meritorious for electroda.pl
    Posts: 2817
    Help: 321
    Rate: 1709
    The EDC fault code means that AdBlue dosing has been interrupted, the power limitation will occur when the creep mode is activated, thus the vehicle will drive approx. 20 km / h. Euro 6 and nonox are not Euro 5, here there is much more dependence on the occurrence of the fault.
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  • #6 17430177
    Transap
    Level 6  
    Posts: 6
    Rate: 13
    Thank you for the tips, but I must point out that Adblue comes off the tank - this edc code lights up, and sometimes there is no message all day.
  • Helpful post
    #7 17430213
    MAN Electronics
    VIP Meritorious for electroda.pl
    Posts: 2817
    Help: 321
    Rate: 1709
    To correctly locate the cause of the fault, you should know:
    - what number is the nonox module (to be able to determine whether a given module will pass the rinsing stage correctly, if necessary)
    - what is the air test pressure
    - what is the air efficiency
    - what amounts are dosed by the module in the test
    - what is the working pressure
    - how the injection nozzle works
    The reason for blocking the dosing system is even a large amount of AdBlue urea (over 100%).
    After the entire repair, appropriate tests and a system reset as well as OBD should be performed.
  • #8 17440837
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    Each module will go through the rinsing process - it matters when it returns to the error - Man lists the code 5038 and 5556 - the pump according to the next serial number.
    Even after replacing it around the diaphragm inside the pump, adblue can still crystallize - a few months ago I opened the pump and started one of the diaphragms - it works to this day.
    In 99%, if someone in the service does not know you, you have to replace the pump plus the cable. Your mistake may also be related to the error of frequent filling of the tank, i.e. not letting the abdlue level drop to 25% or below and signaling the reserve. In other words, frequent filling of adblue for several liters. You refuel with fuel, and adblue only when the reserve lamp lights up.
  • #9 17441065
    MAN Electronics
    VIP Meritorious for electroda.pl
    Posts: 2817
    Help: 321
    Rate: 1709
    Yes, that's right, MAN replaces Nonox modules according to serial numbers under the warranty, however, it is not entirely related to crystallization and ignorance of the problem, as you say. The module you flush may fail anyway (first serial numbers).
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    #10 17441192
    kakibara
    Level 35  
    Posts: 2373
    Help: 201
    Rate: 1275
    After all, I wrote above that it can crystallize again.
    I don't understand what is the matter with not knowing the problem? We try to help my colleague somehow, I can confirm what you wrote above.
    However, Man gave guidelines with diagrams - algorithms for dealing with errors indicated by the computer.
    It is clearly shown what to do.
    I open my printed book, error number, I walk like a child on the line, checking e.g. the injector, if it is clogged, changing to a new one or changing the cable.
    If the two above-described printscreen errors are active, checking the pump number - the tip is correct - replace the cable plus.
    Here we give some hints, because the author of the topic will not buy a bag with the inscription man to check how the pump will inflate it with air.
    He will not buy himself a bottle of acid and stick it on the back of the cabin - you can make a connection from a transparent hose, disconnect the air and give hot water under a pressure of 6 to 12 bar and fire the tab in man cats. I do it every day in the service, but I give advice on how to approach a peasant to save a few thousand. PLN at home. I do not know if Man will take this action under a warranty for a customer who does not service the car on the site. It doesn't matter to me, I go to the warehouse and take the pump, replace it and the client goes and doesn't come back - I had a quiet period at work and I allowed myself to open the pumps, clean these 3 membranes inside and they came to life. Of course, these were not yet recommended by Man to replace the pumps, which were already in the container to be returned to the headquarters - but another went to this place, so there was no problem with the number two. It was before their exchange action that came into force, at least with us, as I remember well about a year, I am writing about because I do not remember exactly.
    The system is simple and almost maintenance-free - the float tank, which also freezes and needs to be started or replaced - also error and limitations.
    Return line flushing or replacement.
    Pump and a small filterek at the entrance.
    Metal wire or injection.
    There are no filters to replace on the staff - decent diagnosis 1.5 hours. I am writing about delivering adblue fluid to the pump and feeding it to the injection - sensor monitoring plus clogged dpf is not moved here.
    PS not knowing the problem? If you thought, buddy, that it is for you - absolutely not.
    If it's for me, I learn hard, but every day.
  • Helpful post
    #11 17441220
    MAN Electronics
    VIP Meritorious for electroda.pl
    Posts: 2817
    Help: 321
    Rate: 1709
    That's right you are right, of course I understand that you are trying to help, the costs are not small for the replacement. What you described, the procedure came when there were problems with the first nonox modules, hence there was a change of serial numbers, in which many things were improved, incl. control strategy. Currently, in the case of nonox problems in the modules with the latest numbers, rinsing is performed, which brings a result, and not as in the previous ones, when it only improved for a moment and the fault returned. In other faults, a software change is made - software data change. Will MAN take action under the warranty when the customer does not service - probably not. When servicing - it refinances in most cases about 80%, but it depends on how much has passed after the warranty and a few other things.
    PS I also work on the site in one of the factory TC.
  • #12 19902998
    KarolSzlachetka1305
    Level 1  
    Posts: 1
    Rate: 3
    What is the cause of code 5022 nonox voltage too high
  • #13 20264410
    marcinkozuch
    Level 14  
    Posts: 93
    Rate: 61
    MAn TGL 12-250
    The following error codes are similar to those of the author
    [img-0] [img-1] Man TGX 480 Euro 6: Adblue System Failure, Error Codes EDC 204547-02, SCR 505022-01 & More Man TGX 480 Euro 6: Adblue System Failure, Error Codes EDC 204547-02, SCR 505022-01 & More Man TGX 480 Euro 6: Adblue System Failure, Error Codes EDC 204547-02, SCR 505022-01 & More
  • #14 20267533
    marcinkozuch
    Level 14  
    Posts: 93
    Rate: 61
    Oh well. I think on Monday I will start cleaning the adblue dosing system
  • #15 20267839
    TruckElectronica

    Level 24  
    Posts: 493
    Help: 73
    Rate: 275
    marcinkozuch wrote:
    on Monday I will start cleaning the adblue dosing system
    what do you want to clean there? like the faults you gave about the electrics ...
    Company Account:
    Truck Bus Electronica
    Opolska, Kraków, 30-000 | Company Website: https://www.truckbuselectronica.pl
  • #16 20273027
    marcinkozuch
    Level 14  
    Posts: 93
    Rate: 61
    Can you say something more? Thanks in advance
  • #17 20577179
    rado084
    Level 10  
    Posts: 243
    Rate: 51
    Hi. I have Man TGL 12.250 e6 and the same error, i.e. EDC 2 04547-02. What was the reason for your friend? My light is on and the car is running but there is an active fault.
  • #18 20577228
    TruckElectronica

    Level 24  
    Posts: 493
    Help: 73
    Rate: 275
    rado084 wrote:
    My light is on and the car is running but there is an active fault.
    it won't take long for it to go into creep mode.... and you'll go 20km/h
    rado084 wrote:
    What was the reason for your friend?
    not every car has the same cause, repairing according to someone else's faults is just a waste of time and money.
    Company Account:
    Truck Bus Electronica
    Opolska, Kraków, 30-000 | Company Website: https://www.truckbuselectronica.pl

Topic summary

✨ The discussion revolves around an AdBlue system failure in a MAN TGX 480 Euro 6 vehicle, indicated by error codes EDC 204547-02, SCR 505022-01, and SCR 505556-10. Users suggest that the SCR 505556-10 error may be due to a blocked return line, while SCR 505022-01 indicates high supply voltage. The EDC error suggests an interruption in AdBlue dosing, which could lead to power limitations, particularly activating creep mode at approximately 20 km/h. Recommendations include checking the nonox module, measuring voltage, and possibly replacing components like the return line and pump. Frequent filling of AdBlue before reaching low levels is also cautioned against. The importance of proper diagnostics and potential software updates is emphasized, along with the need for system resets after repairs.
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FAQ

TL;DR: MAN Euro 6 showing EDC 2 04547‑02 or SCR 505022‑01/505556‑10 can trigger a 20 km/h limp; "AdBlue dosing has been interrupted." This FAQ helps TGX/TGL owners and techs quickly diagnose Nonox voltage/return issues and avoid creep mode. [Elektroda, MAN Electronics, post #17430165]

Why it matters: Prevent forced derate, emissions non‑compliance, and unnecessary pump/harness replacements by fixing root causes fast.

Quick Facts

What does EDC 2 04547-02 mean on MAN Euro 6?

It indicates AdBlue dosing stopped. When creep mode triggers, power and speed drop to about 20 km/h. Euro 6 ties this fault closely to SCR performance. “AdBlue dosing has been interrupted.” Inspect the dosing module, lines, and injector promptly. [Elektroda, MAN Electronics, post #17430165]

Will these faults cause a power limit or limp mode?

Yes. After dosing faults persist, the engine enters creep mode. Then the vehicle drives at approximately 20 km/h. Plan repairs before the derate strands the vehicle. [Elektroda, MAN Electronics, post #17430165]

What does SCR 505022-01 mean on MAN Euro 6?

SCR 505022‑01 flags Nonox supply voltage too high. Measure the module’s supply voltage and check the charging system. Inspect connectors and harness for damage or corrosion. Clear electrical issues before running SCR rinsing or dosing tests. [Elektroda, darfur5, post #17429277]

What does SCR 505556-10 mean on MAN Euro 6?

SCR 505556‑10 denotes a Nonox return line blocked. The dosing system sees a restriction in the return circuit. Inspect the return hose for crystallization, kinks, or collapse. Restore free flow to clear the fault. [Elektroda, darfur5, post #17429277]

How do I clear a return-line blocked fault (SCR 505556-10)?

Replace the return line with the available larger‑diameter version. Measure voltage at the Nonox module and verify dosing operation. Use a mechanic experienced with this system to confirm proper flow. This addresses backpressure and return restrictions. [Elektroda, darfur5, post #17429572]

How do I start diagnosing SCR 505022-01 and 505556-10 on Euro 6?

Follow a structured test plan before replacing parts.
  1. Identify your Nonox module number to determine correct rinsing behavior.
  2. Run tests for air test pressure, air efficiency, dosing amounts, working pressure, and injector function.
  3. After repairs, perform system tests and reset OBD to finalize. [Elektroda, MAN Electronics, post #17430213]

Why does my AdBlue warning appear intermittently?

Intermittent AdBlue warnings reflect intermittent dosing interruptions. The ECU logs EDC when dosing stops, then clears if flow resumes. Expect a derate later if creep mode activates. Investigate the dosing module and plumbing early. [Elektroda, MAN Electronics, post #17430165]

Can frequent AdBlue topping cause errors or crystallization?

Some technicians report issues from frequent small top‑ups. Let level drop to reserve (≈25%) before refilling. This reduces repeated level recalibrations and crystallization risk near tank hardware. Refill when the reserve lamp lights. [Elektroda, kakibara, post #17440837]

When should I replace the Nonox pump and cable?

Replace the pump and harness when faults recur despite cleaning and return‑line fixes. One workshop reports replacing pump plus cable in 99% of such cases. Some revive pumps by cleaning membranes, but replacement is common. Verify applicability by serial number. [Elektroda, kakibara, post #17440837]

Are Euro 6 Nonox systems different from Euro 5?

Yes. Euro 6 SCR and Nonox control have more interdependencies than Euro 5. This affects fault behavior and derate timing. Diagnose with Euro 6‑specific logic and tests. [Elektroda, MAN Electronics, post #17430165]

Why does the Nonox module serial number matter, and will MAN help?

Early modules had issues addressed by revised serial numbers and control strategy. Newer modules respond to rinsing better. If serviced at MAN, post‑warranty support often refinances about 80%. Coverage depends on time since warranty and other factors. [Elektroda, MAN Electronics, post #17441220]

After repairs, should I run a flush and OBD reset, and can overfilling cause a block?

Yes. After repairs, run a system rinse, confirm dosing tests, and reset OBD. Edge case: an excessive AdBlue amount can block dosing and raise faults. Complete tests and the reset to clear learned states. [Elektroda, MAN Electronics, post #17430213]

Should I clean the AdBlue system or diagnose electrics first?

For electrical codes like 505022‑01, prioritize electrical diagnosis. Cleaning won’t fix an over‑voltage fault. “What do you want to clean there? the faults you gave are about the electrics.” Focus on supply and wiring first. [Elektroda, TruckElectronica, post #20267839]

How long can I drive with EDC 2 04547-02 active?

Not long. “It won’t take long for it to go into creep mode... and you’ll go 20 km/h.” Schedule repairs now to avoid a roadside derate. Monitor for escalating warnings. [Elektroda, TruckElectronica, post #20577228]

Should I fix my truck based on someone else’s solution?

Avoid copy‑and‑paste repairs. The same codes can hide different root causes. “Repairing according to someone else’s faults is just a waste of time and money.” Test first, then replace. [Elektroda, TruckElectronica, post #20577228]

Which diagnostic tool should I use to run AdBlue dosing tests on MAN?

Use MAN Cats to trigger dosing tests and injector checks. Follow the printed diagnostic algorithm for each code. Replace injector or harness only after guided checks show faults. This reduces unnecessary parts replacement. [Elektroda, kakibara, post #17441192]
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