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Thread: Invalid VIN Number response from PLX Wifi OBD-2 Device

  1. #1
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    Invalid VIN Number response from PLX Wifi OBD-2 Device

    Hi All,

    I need to fetch VIN number from car's controller using plxKiwi-2 wifi obd2 device. I am getting other information like car rpm,speed,throttle position,etc. in correct format. But when I request for VIN Number it gives me below response.

    014 0: 49 02 01 FF FF FF 1: FF FF FF FF FF FF FF 2: FF FF FF FF FF FF FF

    which is invalid.In Hyundai's EON car, I got proper response for VIN Number,but in almost all other cars, I got above mentioned response. So is there any specific 'AT' command to get the proper VIN response ?? Please help .

  2. #2
    FLAC SNOtwistR's Avatar
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    I think the pid for vin is 09 02 have you done 01 00 to get a list of supported pid's. Hope this helps SNO

  3. #3
    Variable Bitrate
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    It happens. Some cars will give out all FF's to a Vin request.
    Nothing wrong with your device.

  4. #4
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    @SNO thanks for the reply. I have already checked for supported PIDs of Mode-09 using 09 00. In that response, I am getting '1' (Set Flag) for pid-02 , it means that it supports VIN Number.

  5. #5
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    @p2psmurf:

    It's fine that some cars give out FF. So Once we convert it in ASCII chars. It will show as ????. It's obviously Invalid VIN Number.
    So Is there any other solution by which we can get correct VIN Number response so that we can convert it in ASCII and get proper VIN Number.

    Is it possible to get correct VIN Number for those cars which always returns FF FF ?

  6. #6
    Variable Bitrate
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    The only way is to use a factory (or equivalent) scanner that supports the factory protocol in stead of an OBD2 protocol.

  7. #7
    Low Bitrate
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    Its possible only if you know the PID for the manufacturer specific protocol, which %99 of the time isn't known to the public.

  8. #8
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    vin

    Hi,
    Please can you help me to find out a solution for my problem, So I want to read the VIN number using ELM327 I was read many documents about this and I don't undrestand how to retreive the 5 messages in which we can found the vin number!!!

  9. #9
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    Quote Originally Posted by sbs585 View Post
    Hi,
    Please can you help me to find out a solution for my problem, So I want to read the VIN number using ELM327 I was read many documents about this and I don't undrestand how to retreive the 5 messages in which we can found the vin number!!!
    what is your vehicle?

    Try 0900 and see if you are getting resonance value greater than 0x80 (ex 0xC0, 0xF0)

  10. #10
    Newbie clickdrive's Avatar
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    If you can get hold of a manufacture's scanner then it should be fairly easy to use a 'Y' cable to get the information. Put the manufacturer's device on one end and your ELM327 on the other in monitoring mode and make note of PID/s sent.

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