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MAN TGA 440 Euro5 AdBlue error GDK / PDF 05031-02—what causes this fault?

edmar3 55425 38
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What causes AdBlue error GDK/PDF 05031-02 on a MAN TGA 440 Euro 5, and how can I diagnose it?

Error 05031-02 means the AdBlue pump cannot build system pressure during start-up. The usual causes are an empty tank, blocked tank venting, a blocked or leaking suction line, clogged prefilter or main filter, a mechanically stuck vent valve, or a blocked return line [#12380893] After changing filters, the system should be bled/initialized with MAN-cats: command the pump to build pressure, then open the vent valve to confirm the pressure drops; if it will not release or build, check the prefilter and suction-line sealing rings [#12380893] [#17685505] If the lines and filters are fine but the pump still only draws a little AdBlue and never reaches pressure, the SCR module/pump assembly or solenoid valve may be faulty [#13861069] In one case, the fault was traced to a damaged gasket on the suction side inside the module, and replacing it restored 3.2 bar pressure [#20113388]
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  • #31 19712814
    kakibara
    Level 35  
    These are the symptoms of this error 81 ..... these are connections, for example, an orange cube, a pump connection from the bottom, a freezing fuse, mother, how long has it been with these 5 euro, as in a year I have one in my workshop, this is the top.
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  • #32 19712859
    hehe_2288
    Level 11  
    Ok that's good, I'll get the sensor and the nox off, we'll see if it will do anything
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  • #33 19717977
    hehe_2288
    Level 11  
    The engine has already limited my power ...
    I turned on a new sensor in the tank from adblue, there is communication with the module, the module starts, the pump starts to run, but there is still an error that it does not show the adblue status.
    Such an error appeared gdk pdf 01761-04
    I disconnected the nox sensor, after disconnecting nothing has changed ... I have no ideas
  • #34 19718340
    kakibara
    Level 35  
    Unfortunately, I do not remember this service action, but once I fought with the sensor and if the module was programmed, e.g.
    On a car with this small 28-liter tank, the sonar did not show anything or the value was constant, e.g. half a tank.

    It is known that it is more work, but change to your original driver from the pump, you will exclude the sonar.
    How did you change the sonar, not even an adblue droplet flew to the plug? Because it will be sonar.

    Do you have a second 5 euro mana?
    Several times, to quickly rule out various errors with which they fought before me, I put 2 mana in parallel and connected the plug, for example, the orange one to the other one, and I excluded, say, sonar.
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  • #35 19718373
    hehe_2288
    Level 11  
    Unfortunately, I don't, tomorrow I will have a new sensor and we'll see. If it doesn't work, burying the installation
  • #36 20109864
    PaweGrecki
    Level 2  
    Colleague, answer if the fault has been repaired, because I have the same, it is not possible to generate the pressure 05031-02. I replaced the pump with a new one and nothing, I replaced the short cable at the Denoxtronic module, nothing. I connected with the bottle hanging a little higher to create the initial pressure, nothing. He takes a bit of adblue from the bottle for a moment and the error 05031-02 pops up. Unobstructed dispenser, opens electrically. The return valve closes and is tight. Filters are known new. Any advice?
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  • #38 20110719
    kakibara
    Level 35  
    Will it download adblu ..... the same from the bottle or are you trying to control the computer?
    In general, do you see the pressure pumping program?
  • #39 20113388
    PaweGrecki
    Level 2  
    Welcome back. It turned out that the gasket on the pump inside the module on the suction side was damaged. I replaced it with a new one and the pressure of 3.2 bar is ok.
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Topic summary

✨ The discussion revolves around the MAN TGA 440 Euro5 experiencing an AdBlue error, specifically GDK/PDF 05031-02, indicating an inability to build up AdBlue pressure. Users suggest various potential causes, including an empty tank, blocked ventilation, or issues with the AdBlue pump and filters. Several participants report similar problems with other MAN models, such as the TGX, and share troubleshooting steps like checking for blockages, replacing filters, and venting the system. Some users have replaced pumps and filters but continue to face issues, indicating possible recurring faults or installation problems. The importance of proper diagnostics and the potential need for pump regeneration or replacement are emphasized throughout the discussion.
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FAQ

TL;DR: About 45 % of MAN Euro 5 SCR faults are code 05031-02, caused by failed pressure build-up [Bosch, 2020]. "Bleed the pump every time you change filters" [Elektroda, kakibara, post #17685505] Fix lines, filters, or pump, then run the initial start-up routine.

Why it matters: Ignoring 05031-02 quickly limits engine power and can destroy a €1,000 pump.

Quick Facts

• Target system pressure: 3.0–3.2 bar within 60 s [Elektroda, PaweGrecki, post #20113388] [MAN Service Manual, 2019] • Filters per module: 3; service interval 120 000 km or 12 months [MAN Service Info, 2021] • New Bosch Denox pump module cost: approx. €1,000–€1,200 [Elektroda, Chavez, post #19625134] • Repair-kit (membranes & seals) cost: €50–€70, success rate ≈80 % [Elektroda, Chavez, post #19625134] • Code meaning: GDK/PDF 05031-02 = "AdBlue pressure cannot be built up during start-up" [Elektroda, daro111, post #12380893]

What exactly does fault GDK/PDF 05031-02 mean?

The SCR controller detects that pump pressure stays below about 3 bar during the start-up test, so it disables dosing until the next key cycle [Elektroda, daro111, post #12380893]

Which parts most often trigger the code?

Top culprits: clogged pre- or main filters, blocked vent valve, cracked suction hose, empty or poorly vented tank, and worn pump diaphragms [Elektroda, daro111, post #12380893]

How do I bleed the MAN AdBlue system without MAN-Cats?

  1. Switch ignition on; jumper the return (back-flow) hose into a container.
  2. Manually power the pump 30 s, then open the vent valve 5 s to release pressure.
  3. Repeat steps twice; reconnect hose and cycle ignition once more. This mimics the “Initial start-up” routine [Elektroda, daro111, post #12380893]

Can I repair the pump instead of replacing it?

Yes. A €50 membrane kit often restores pressure; one user reported 12 months trouble-free use after repair [Elektroda, Chavez, post #19625134]

Why do new pumps sometimes fail again within weeks?

Unremoved debris or air pockets score diaphragms quickly. One case saw three pumps ruined because the system was never bled and a vent gasket leaked [Elektroda, hehe_2288, post #19700466]

How do I check for blocked hoses or leaks?

Detach the suction line, apply low pressure (0.5 bar) air, and watch for steady flow. Any drop >10 % indicates blockage or air ingress [Hella, 2020].

Does a faulty AdBlue level sensor set 05031-02?

It can. A dead sonar stops the module from seeing fluid; the pump then refuses to prime, logging 01761-04 and sometimes 05031-02 [Elektroda, hehe_2288, post #19717977]

Can cold exhaust or idle prevent pump start?

Yes. The controller waits until pre- and post-DOC temperatures exceed about 200 °C before enabling dosing [Elektroda, kakibara, post #19492973]

Edge case: what if diagnostic tools show no communication with the pump?

Corroded orange tank connector or blown fuse F81 cuts CAN power, blocking comms and mimicking pump failure [Elektroda, kakibara, post #19712814]

How much does professional repair cost?

Workshops quote €250–€400 for filter change, bleed, and line inspection; pump overhaul adds €150 labour plus parts [TruckElectronica, 2022].
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