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[Solved] Renault Trafic 2.5dci 2010 (G9U): Loss of Power, Max 3500 RPM, DF038 Error, Turbo Load, DPF Cut

decybel91 16278 10
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Why does a Renault Trafic 2.5 dCi (G9U) lose power and stop pulling above about 3500 rpm with DF038 stored, especially with a cut DPF?

DF038 is a generic fault code with several possible sub-errors, so you need Renault CLIP to read the exact DF038 component before further diagnosis [#17003620] In this thread, the likely cause was the ECU software/modified calibration: one user suspected a badly removed DPF, and the original poster later reported that new software in the ECU solved the problem [#17004380] [#17005714] [#17005717] A similar case was also fixed by restoring the original software after an EGR cut, which points to the tune/ECU logic rather than the measured rail pressure itself [#17004046]
AI summary based on the discussion. May contain errors.
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  • #1 17002841
    decybel91
    Level 43  
    Posts: 8006
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    Renault Trafic 2.5dci (g9u?) 2010.
    The symptom is a lack of power, i.e. the car drives quite briskly to 3500 rpm, then nothing. Sometimes it speeds up to 110 km, sometimes up to 130 km, you don't know why.
    Error only df038,
    turbo loads about 2-2.1 bar with max gas
    and
    air flow approx. 350 kg / h as above.
    The fuel pressure is about 320 bar as above.

    I will add that the car has a cut out dpf (judging by the welds quite a long time) and I do not know since when it drives like this.

    Suggestions? I don't have a clip.
    best regards
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    #2 17003177
    szymitsu21
    VIP Meritorious for electroda.pl  
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    What is this error?

    What happens above those 3500rpm with fuel pressure, boost, air flow?

    Because it probably doesn't hold 320bar at full throttle?
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  • #3 17003547
    decybel91
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    It holds the pressure within 300bar.
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    #4 17003620
    Jamrug
    Level 17  
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    The DF038 error can have several components:
    DF038
    1.DEF: A / D Converter
    2.DEF: EEPROM Writing
    3.DEF: EEPROM Reading
    4.DEF: Entering injector codes
    5.DEF: Self-control memory
    6.DEF: Watchdog not refreshed
    7.DEF: command line on Noise injectors
    8.DEF: Enable watchdog

    You need to connect CLIP and then you will see one of the components and this will help in further diagnosis.
    Greetings
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    #5 17004046
    DoctorCar
    Level 19  
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    Make logs of this fuel pressure, because I had it, but in 2.0dci after EGR cut. The fuel pressure didn't change and the car kept driving like that. After uploading the ORI software, everything returned to normal.
    PS As for me, the lack of power is immediately, and not above 3500 rpm where there is no need for diesel to turn higher in normal driving
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    #6 17004380
    szymitsu21
    VIP Meritorious for electroda.pl  
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    decybel91 wrote:
    It holds the pressure within 300bar.


    If he keeps 320 bar with his shoe full, it's strange that the car doesn't go out. Recently, I had a Movano like that with this motor, at full load at high revs, the pressure reached 900 and it goes into emergency mode too low pressure.
    I suspect that you have a poorly removed DPF
  • #7 17004399
    Frost160
    Level 14  
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    How do you read it? Maybe the stupidity program shows because there is no option for it to run at 3000rpm at that rail pressure. At a standstill, it should go up when you increase the revolutions.
  • #8 17004627
    decybel91
    Level 43  
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    The case is, the fuel pressure is between 280 and 320bar, after filter replacement between 300 and 350bar. At the moment I have an appointment for a clip, I will let you know how it went. best regards
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  • #9 17004920
    DoctorCar
    Level 19  
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    szymitsu21 speaks well about a badly made DPF in the driver. For me it was the same with EGR. You can turn off the limiters in the controller and it will drive with each fault until the car is completely dead, and at the same time it will not save any error. The more so because there is no history of the car
  • #10 17005714
    decybel91
    Level 43  
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    The new soft resolved the matter.
  • #11 17005717
    decybel91
    Level 43  
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    New soft in the ECU.
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Topic summary

LABEL_AI_GENERATED
The discussion revolves around a 2010 Renault Trafic 2.5dci (G9U) experiencing a loss of power, particularly noticeable at 3500 RPM, accompanied by a DF038 error code. Users suggest that the issue may stem from various factors, including fuel pressure inconsistencies, a poorly removed DPF, or EGR problems. The fuel pressure readings fluctuate between 280 and 350 bar, and there are concerns about the vehicle's ability to maintain adequate pressure under load. Recommendations include connecting a CLIP diagnostic tool for further analysis and considering software updates to resolve the issue. One user reported that updating the ECU software successfully addressed the power loss.
AI summary based on the discussion. May contain errors.
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