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Jb4 wont connect

gt2shawn

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May 18, 2025
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I've recently gotten an jb4 and it won't connect at all. It confirms everything and verifies everything but at the last part of connecting it doesnt. I went to start my car and it idled like shit and showed low oil pressure, I was told i need to update the firmware to fix that problem with the car but i cant even connect. suggestions?
 

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Are you sure you installed it correctly? I was unable to connect when I installed the JB4 and it did not affect how the engine ran. Did you buy used?
 
Are you sure you installed it correctly? I was unable to connect when I installed the JB4 and it did not affect how the engine ran. Did you buy used?
yea it was used
 
______________________________
yea it was used
I would first ensure installation is correct. Then I would email BMS support. They had to help me get connected.
 
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Hey did you get this fixed?
 
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