JB4 ECU CANbus Harness (OBDII Alternative) for BMW G Chassis
SHIPPING - RETURNS - WARRANTY - CANCELLATION POLICY
*** Market Conditions after 2020 have changed the landscape of automotive parts. Although we try to stock 1000's of items in our multiple warehouse and use multiple distribution channels, having back-orders are unavoidable in today's market. If you are in need of a product quickly, we suggest email, message, or call us for availability so that we may explore your options.
Email: Sales@Speedzoneweb.com
Call: 407-846-8430
Text: 407-749-6314
Frequently Asked Questions
Simplify your G Chassis BMW JB4 installation with our new Direct CANbus Harness. This plug-and-play harness connects the JB4 directly to the vehicle’s CANbus at the ECU, eliminating the need to route a CAN/OBDII cable through the firewall and into the passenger compartment.
The result is a cleaner, faster, and easier JB4 installation with no need to run wires inside the passenger compartment to access the OBDII port under the dash.
Also allows passive CANbus mode where the JB4 uses read only channels for its basic tuning, allowing full use of the OBDII port for logging via MHD or any other scan tool during full throttle runs!
NOTE: Requires compatible JB4 or JB4PRO firmware and settings to enable. For JB4PRO B58/S58 systems turn on option 11 to enable, and turn on option 12 to run the JB4PRO in passive mode only. In passive mode certain channels such as AFR and timing corrections are not available, so this mode would normally only be used while the OBDII port is otherwise occupied. Not compatible with 2025+ Gen3 B48/B58 platforms.
Features:
- Direct CANbus connection at the ECU
- Eliminates routing wiring into the passenger compartment
- Cleaner, more professional installation
- Significantly reduces installation time and hassle
- Plug-and-play design for G Series B58 S58 BMW and B58 Supra
- Higher CANbus sample rate being directly on PTCAN
All sales for Burger Motorsports and Fuel-It! products are final. These items are not eligible for return or exchange under any circumstances. Please ensure compatibility and fitment before placing your order.
Our History
For 26 years Speedzone Performance LLC has been providing aftermarket car parts to Central Floridians and 1000's of customers online. What makes us different than all the other places online? We have 3 actual brick and mortar locations where were serve customers daily and find new ways to provide support and assistance to the automotive community at large. From our in house SPDZ1 Brand, to our constantly growing in stock inventory, we strive to make our customer service and ease of purchase stand out from the rest! We are also one of the largest automotive part financing providers anywhere in the United States, and continue to provide more options for our customers every year. We love what we do, and it shows in every product we sell and every new customer who becomes a part of our Speedzone Family.