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kmoto kmoto is offline
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Posts: 1
Join Date: Apr 2019
Car: '18 F36 440i
Default Bluetooth Connectivity/Codes: 121002/120408 - 04-24-2019, 11:26 AM

First and foremost, long time supporter and user of Terry's products. I've used them on my past 3 cars with nothing but great things to say. Now that's out of the way...Haha

I've searched the forums/install/troubleshooting guides.

Car is a 2018, B58 440i Gran Coupe and it's been tuned since November '18 with zero issues until recently (past week).

Here are the issues:
  • Mobile App Connectivity = Spotty, sometimes fully functional other times it states "connected" but no gauge readings
  • Difficult to replicate faults and log as the app doesn't full connect and/or the reduced power mode happens so sporadically
  • Sporadic Codes/Drive train & MAP sensor faults (at cruising, not WOT):
  • 108005 No Description Found
  • 121002 MAP Sensor, short to ground
  • 120408 Reduced Power Mode

What I've done:
  • Updated firmware to most recent release
  • Uninstalled and reinstalled JB4
  • Uninstalled and reinstalled JB4 Mobile App

The JB4 came with the Bluetooth adaptor installed, so when reading about repositioning the ground wire - Didn't seem applicable?

Appreciate your help and all that you guys do for the community!

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Terry @ BMS's Avatar
Terry @ BMS Terry @ BMS is offline
Posts: 31,315
Join Date: Jan 2008
Default 04-24-2019, 05:03 PM

Maybe water damage on the JB4 board or blue tooth if it's been fine and suddenly acting up? You can open the enclosure and check everything out.

JB4 Mobile How To - YouTube

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Home of the JB4 the worlds most popular turbocharged tuning system!

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