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19 M550 JB4 Codes and Drivetrain malfunction help -
05-11-2020, 07:41 AM
Hi All.
Recently Had my JB4 installed ( at dealer ) It was running fine for about a week, then one afternoon I got a CEL when starting the car. I ran the Mobile App to find the code. Nothing... I had no issues with car at all. A few days later, I got a drivetrain malfunction and went into limp mode. After running the app again to check for codes i got a code 120908.I was in map 3 driving spirited and when I let of the gas, the malfunction popped up. I parked the car and let it sit overnight. Upon restarting, The Drivetrain malfunction was still there. The car was driving just fine. After a few days the CEL disappeared but the drivetrain malfunction was still there. After reaching out to BMS I did a few logs and was told to update the firmware which I did. Immediately after the firmware update I recieved a CEL again and several new codes. 190302 120308 108f01 120408 120902 Any guidance would be appreciated. I reached out to BMS and still waiting for a response. thank you 
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05-11-2020, 07:42 PM
Have a JB4 log so we can see the details?
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