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DMC FW: Battery Under Voltage fault, PEM Vbat different from BSM Vbat warning

Discussion in 'Roadster: Technical' started by Austrianer, Sep 27, 2016.

  1. Austrianer

    Austrianer Member

    Joined:
    Aug 20, 2014
    Messages:
    30
    Location:
    Austria
    #1 Austrianer, Sep 27, 2016
    Last edited: Sep 27, 2016
    Last weekend my Roadster alerted Fault during acceleration and switched off motor torque, luckily the car kept rolling until I found a way off the street.

    Several error codes were displayed, SOC were at 63%, (see photo from the log):
    1067 - Debug: DMC FW: Battery Under Voltage warning. Torque limited.
    939 - Debug: DMC FW: Battery Under Voltage fault.
    269 - Debug: BSM: Negative contactor/economizer stuck low.
    270 - Debug: BSM: Negative contactor/economizer stuck high.
    1085 - Debug: DMC FW: PEM Vbat different from BSM Vbat warning.

    After I confirmed the errors on the VDS and restarted the car with the key, it runs normally.
    Yesterday I made several hard acceleration test drives, but no problem at all.

    I reported this to the SEC, their first analysis according to the error codes 1067 and 1085 - there might be a mismatch between the BSM and PEM voltage reporting, maybe a PEM swap is necessary.

    Anyone run into this combination of errors ?
    Changing the whole PEM is necessary or anyone knows which part of the PEM could be defect, because we are running out of PEMs at my SEC ?

    BTW: Error codes 270, 1067 and 1085 are new for our error code summary !
     

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  2. Austrianer

    Austrianer Member

    Joined:
    Aug 20, 2014
    Messages:
    30
    Location:
    Austria
    A Short Update:
    After several trips with hard accelerations and approx. 200 km of driving everything seems to work normally, no further error messages.

    I haven't checked all Logs since I'm taking them, but it seems the ESS Voltage falls below 300 V for the very first time, never saw this before.
     
  3. dhrivnak

    dhrivnak Active Member

    Joined:
    Jan 8, 2011
    Messages:
    3,155
    Location:
    NE Tennessee
    I unfortunately have seen similar 1 time errors. Fortunately most have not returned in years. So one time glitches are possible.
     

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