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Man TGX 440 Euro6: Temperature Balloon Indicator Turns Off After 30 km Drive

mikiman440 29181 13
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  • #1 17061270
    mikiman440
    Level 7  
    Hello, the balloon with the temperature man tgx euro6 thermometer is displayed, it goes out after 30 km, what can it be when the car lights a lot, it burns for a moment, greetings please answer
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  • #2 17061296
    sebastian607
    Level 17  
    Maybe it burns DPF, connect the computer and it will explain.
  • #3 17061409
    MACIEK_M
    Level 29  
    Everything is clearly explained in the operating instructions. Just read.
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  • #4 17061880
    kakibara
    Level 35  
    So tell me what is written in this manual?
    Because as it often ignites there can be a problem with the egr and within a few thousand km the engine says bye.
    But the balloon speaks of high exhaust gas temperature.
  • #5 17062198
    mikiman440
    Level 7  
    for this is lit engine error I do not have an error code it is possible that the exhaust is clogged EGR was mentioned in the service because he took a coolant
  • #6 17073545
    mikiman440
    Level 7  
    What is TCu error 00191-08, DIAG 03404-02 ZBR 03500-00
  • #7 17790233
    szyniu
    Level 20  
    MAN TGX 440 2014 mileage 580000 km
    Hello, I have a similar situation, after replacing the egr radiator (apparently regenerated, it was damaged because the engine took in the coolant) in some service lights up (smoke with a thermometer) and additionally today the yellow engine light popped up, I know that the smoke light with a thermometer is displayed at high temperature exhaust gas but I do not know in what conditions it ignites and which sensor is the main information provider.
    If anyone has a broader knowledge, please provide information, maybe a technical note or a proposal to solve the problem.
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  • #8 17790322
    Bulos5
    Level 11  
    Does the blue ad download normally?
  • #9 17791179
    szyniu
    Level 20  
    Yes downloads. Nobody reported that there was any departure from the norm.
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  • #10 17792349
    kakibara
    Level 35  
    You did not enter the engine error number which in this case is the most important information.
    As you well know, there are several sensors monitoring the exhaust system and without a mistake it is a light trick.
  • #11 17792544
    szyniu
    Level 20  
    Does not display errors on the board only the control

    Added after 2 [hours] 1 [minutes]:

    As soon as I diagnose, I will share info
  • #12 18951512
    arek888
    Level 11  
    and what, buddy, did you diagnose?
  • #13 19623028
    JarosawAdamczyk
    Level 2  
    Buddy and how What was the cause of the ignition and temperature of high exhaust fumes
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Topic summary

✨ The discussion revolves around a Man TGX 440 Euro6 truck experiencing an issue where the temperature balloon indicator turns off after driving 30 km. Users suggest potential causes, including a clogged exhaust system or problems with the EGR (Exhaust Gas Recirculation) system. One user mentions a specific error code (TCu error 00191-08) and another user shares a similar experience after replacing the EGR radiator, indicating that high exhaust gas temperatures may trigger the warning light. The importance of diagnosing engine error codes is emphasized, as they provide critical information for troubleshooting the issue.
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FAQ

TL;DR: 580,000 km case: “the smoke-with-thermometer light means high exhaust gas temperature.” If it clears after a steady drive, it aligns with normal DPF regeneration; if it repeats, scan the truck and check EGR/EGT/DPF sensors. [Elektroda, szyniu, post #17790233]

Why it matters: This FAQ helps MAN TGX Euro 6 drivers diagnose a recurring hot‑exhaust icon and prevent costly aftertreatment damage.

Quick Facts

  • The thermometer-in-smoke icon indicates elevated exhaust temperature during DPF regeneration; avoid stopping on flammable surfaces until it clears. [“MAN TGX Euro 6 Operator’s Manual”]
  • During active regeneration, exhaust gas temperature can exceed 500°C; keep the exhaust area clear of people and combustibles. [Bosch, 2014]
  • Frequent re-ignitions can point to EGR issues; unresolved EGR faults can escalate engine risk. [Elektroda, kakibara, post #17061880]
  • The dash may show the icon without a numeric fault; connect a diagnostic computer to confirm regen status or stored errors. [Elektroda, sebastian607, post #17061296]
  • Typical AdBlue usage is about 3–5% of diesel consumption; normal draw suggests SCR is functioning as expected. [“MAN Truck & Bus — AdBlue: Q&A”]

What does the thermometer-in-smoke icon on a MAN TGX Euro 6 mean?

It indicates the exhaust aftertreatment is very hot because the DPF is regenerating. The system raises exhaust temperature to burn soot in the filter. Continue driving and avoid parking on flammable surfaces until the lamp clears. The icon turns off once temperatures fall after regeneration completes. [“MAN TGX Euro 6 Operator’s Manual”]

Why does the light turn off after about 30 km of driving?

A steady drive allows the engine to reach operating temperature and sustain the conditions needed for automatic DPF regeneration. When soot burn-off completes, exhaust temperature drops and the icon extinguishes. If the light reappears frequently in short intervals, schedule diagnosis to check load, sensors, or EGR performance. [“MAN TGX Euro 6 Operator’s Manual”]

Is it safe to keep driving when that hot-exhaust light appears?

Yes. Keep driving so regeneration can complete. Follow the safety instruction: “Do not park on readily flammable surfaces.” Avoid idling or shutting down mid‑regen if possible. The light should clear when the DPF finishes burning off soot. If it persists or the engine lamp joins, scan for faults. [“MAN TGX Euro 6 Operator’s Manual”]

Which sensor is the main information provider for this warning?

Engine management uses multiple inputs: exhaust gas temperature sensors (before/after the DPF) and the DPF differential pressure sensor. High EGT during an active regen is expected; abnormal readings or pressure signals can trigger warnings or repeated regens. “DPF regeneration demands high exhaust temperatures.” [Bosch, 2014]

How do I complete a regeneration quickly and safely on the road?

  1. Warm the engine fully, then maintain steady, moderate load at road speed.
  2. Keep driving without prolonged idling or stop‑and‑go until the icon clears.
  3. Do not park on combustible surfaces while the hot‑exhaust warning is on. [“MAN TGX Euro 6 Operator’s Manual”]

I changed the EGR cooler and the icon now lights often. What should I check?

Check for residual coolant contamination, EGR valve sticking, and leaks that raise soot formation. Verify DPF soot load and inspect EGT and differential pressure sensor plausibility. Repeated hot‑exhaust indications after EGR service strongly suggest EGR malfunction or related aftertreatment stress. Address it promptly to prevent further damage. [Elektroda, kakibara, post #17061880]

The engine lamp is on, but no code shows on the cluster. What should I do?

Not all faults display as text codes on the dash. Connect a diagnostic computer (e.g., MAN‑cats or equivalent) to read stored engine, aftertreatment, and chassis module faults. This confirms whether the event was a normal regen or a fault condition that needs repair. [Elektroda, sebastian607, post #17061296]

What do TCU 00191-08, DIAG 03404-02, and ZBR 03500-00 mean?

Those are module-specific fault identifiers from the transmission (TCU), diagnostic manager (DIAG), and central body module (ZBR). Their meanings depend on the vehicle’s dataset. Use MAN‑cats to read full descriptions, freeze‑frames, and standard SPN/FMI equivalents for correct troubleshooting. [“MAN-cats II Diagnostic System — User Guide”]

Does AdBlue usage affect this hot-exhaust icon?

The icon relates to DPF regeneration, not SCR dosing. That said, normal AdBlue consumption around 3–5% of diesel indicates SCR is working. Abnormal AdBlue faults may trigger the engine lamp, but they do not directly cause the hot‑exhaust symbol. Diagnose both systems if warnings persist. [“MAN Truck & Bus — AdBlue: Q&A”]

What edge cases cause the light to stay on or recur frequently?

Edge cases include failed EGT sensors reporting implausible values, blocked DPF pressure hoses, or excessive soot from air/EGR faults. A sensor stuck low may prevent regeneration; one stuck high can trigger repeated regens. Inspect sensors and pressure lines before condemning the DPF. [Bosch, 2014]

How can I tell a regeneration is happening besides the icon?

Expect the hot‑exhaust icon and driver notification. Engine management may adjust fueling and exhaust temperature control. The key action is to keep driving until the indicator clears. If messages repeat without clearing, have the system checked with a diagnostic tool. [“MAN TGX Euro 6 Operator’s Manual”]

What’s the best first diagnostic when the icon appears often?

Scan the engine and aftertreatment with a proper tool. Record DPF soot load, differential pressure, EGT sensor values, and regen counters. Review freeze‑frames for operating conditions and fault frequency. This narrows whether you face normal regens, sensor errors, or hardware issues. [“MAN-cats II Diagnostic System — User Guide”]
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