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-   -   19 M550 JB4 Codes and Drivetrain malfunction help (https://www.jb4tech.com/forums/showthread.php?t=61961)

Riffyb 05-11-2020 07:41 AM

19 M550 JB4 Codes and Drivetrain malfunction help
1 Attachment(s)
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.

Any guidance would be appreciated. I reached out to BMS and still waiting for a response.

thank you

Terry @ BMS 05-11-2020 07:42 PM

Have a JB4 log so we can see the details?

Riffyb 05-12-2020 04:43 AM

1 Attachment(s)
Yes please see attached

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