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[Solved] Troubleshooting MAN TGX D2676 LF46 SCR system complete shutdown

bagolykiralyxd 396 7
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  • #1 21517426
    bagolykiralyxd
    Level 2  
    A laptop screen showing a list of vehicle diagnostic error codes.
    Laptop screen displaying diagnostic software with a list of errors.
    Laptop with TEXA diagnostic software displaying error codes related to the AdBlue system.
    Hello everybody I have encountered the following errors on a MAN TGX engine code D2676 LF46.
    What could be the cause of these many problems?
    List of error codes:
    3055
    3056
    4559
    4562
    3041
    3830
    4058
    3053
    4059
    4060
    4377
    4374
    3830
    4058
    3053
    Also the gearbox is also acting up it has a real hard time changing gears. could they be related?
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  • #2 21519310
    kakibara
    Level 34  
    Hi check the electrical wiring behind the engine block on the right side.
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  • #3 21520097
    SamuelYork
    Level 1  
    Any update with repair?
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  • #4 21520265
    kakibara
    Level 34  
    And what did you check then write. After your work, what disappeared from the errors what showed up? Did you measure the electrical wiring cubes? The fuses in the box and on the engine ? Did you check the electrical connections on top of the engine ? Electric water pump and above it the harness ?
    When you have done this let us know update/feedback.
  • #5 21520714
    bagolykiralyxd
    Level 2  
    >>21520265
    I have checked on the right side of the chassis under the adblue pump the wiring it was full of water and one cable was broken fixed it still the same error codes pop up. I checked the line between the oil pan and the intercooler it was dry and everything was in order. I measured after repairs everything and the problem seems to be coming from the combined adblue sensors in the tank.
  • #6 21520834
    kakibara
    Level 34  
    You can swap by just unplugging the cube above the tank. The electrical wire between the exhaust silencer (from the cube) may be faulty can - to the tank specifically. I doubt that the sensors in the tank generate that many errors.
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  • #7 21539469
    bagolykiralyxd
    Level 2  
    The issue with the truck was a faulty Egr valve.
  • #8 21539470
    bagolykiralyxd
    Level 2  
    The issue with the truck was a faulty EGR valve. As it was short circuiting and communication didn't went thru to the other components
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Topic summary

A MAN TGX truck with engine code D2676 LF46 experienced multiple SCR system error codes (3055, 3056, 4559, 4562, 3041, 3830, 4058, 3053, 4059, 4060, 4377, 4374) and gearbox shifting difficulties. Initial troubleshooting focused on electrical wiring behind the engine block and under the AdBlue pump, where water ingress and a broken cable were found and repaired, but errors persisted. Further inspection suggested potential faults in the combined AdBlue sensors in the tank; however, it was advised to check the CAN wiring between the exhaust silencer and the tank sensor connector. Ultimately, the root cause was identified as a faulty EGR valve causing a short circuit and communication failures across components, which also likely affected gearbox operation.
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