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Audi A3 8P - Dead Speedometer 8P0920951G: MCU Voltage, CAN LO & HI Issues, Fault Diagnosis

rosak 11583 6
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16861235
    rosak
    Car dashboards specialist  
    Hello,
    I can not cope with the counter Audi A3 8P 8P0920951G.
    The counter is dead, although the MCU gets a voltage, the oscillator works, but after the power is applied, CAN LO and CAN HI give a continuous voltage of approx. 3V for about 2 seconds. It should send a dozen or so frames during this time.
    From what I read it is quite a typical fault, but I have not found any specific information.
    Thanks in advance for your help.
    greetings

    Audi A3 8P - Dead Speedometer 8P0920951G: MCU Voltage, CAN LO & HI Issues, Fault Diagnosis Audi A3 8P - Dead Speedometer 8P0920951G: MCU Voltage, CAN LO & HI Issues, Fault Diagnosis
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  • #2 16864368
    rosak
    Car dashboards specialist  
    I did as you suggested in PW, it didn't help.
    I read that a common glitch in this counter is the MCU going into deep sleep, apparently after combining with FTDI or DP clones. Unfortunately, I have no contact with the client, so I don't know if anything like that happened.
    If this is the cause, how do I fix / check it? I do not have DP3, it goes to me by an extremely circular road. I only have CarProg and Xprog 5.70.
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  • #3 19875142
    kefir200
    Level 12  
    I have the same problem with clocks, they are completely dead. Should the clocks show anything after connecting the power supply to pins 1,2 and 18 and grounding to 3,4 and 19? Is it necessary to connect CAN and other modules?
  • #4 19875475
    adam7009

    Level 41  
    without can, nothing will be displayed, but communication and diagnosis must be. As after the attempt to correct the corrections they are dead, the flash has broken, repair after the OBD.
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  • #5 19878122
    kefir200
    Level 12  
    They were not taken apart and the correction was not made either. Over the course of two weeks, they did not turn on every few activations until they died completely. I will check today if I have communication. I got a hint that it usually rains only on a large plate with clocks. Is it true?
  • #6 19878705
    adam7009

    Level 41  
    it is raining, the one with the picture at the top.
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  • #7 21477534
    essahihi1996mastafa
    Level 1  
    Have you ever got to the bottom of this did you fix this cluster I have one with the same problem
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Topic summary

The discussion addresses a common fault in the Audi A3 8P instrument cluster (part number 8P0920951G) where the speedometer is non-functional despite the MCU receiving voltage and the oscillator operating. The issue involves the CAN bus lines (CAN LO and CAN HI) showing a steady voltage (~3V) for about two seconds after power-up, instead of transmitting multiple CAN frames. This symptom suggests a communication failure possibly linked to the MCU entering a deep sleep mode, potentially triggered by interactions with FTDI or DP clone devices. Attempts to revive the cluster by power supply alone are ineffective without CAN bus communication. The flash memory may be corrupted, requiring repair via OBD diagnostics. Some users report progressive failure over multiple power cycles until complete shutdown. There is also mention of moisture ingress ("it is raining") on the main circuit board as a possible cause. Tools referenced for diagnosis and repair include CarProg and Xprog 5.70, with DP3 noted as unavailable. The cluster requires proper CAN bus connection to function and display data.
Summary generated by the language model.
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