JB4 Tuner for 2026+ Jeep Grand Cherokee 2.0T Hurricane 4 Turbo

Take your 2.0L Hurricane 4 Turbo to the next level with JB4 performance tuning!

The JB4 is an advanced, highly featured tuning system for the new 2026+ Jeep Grand Cherokee equipped with the 2.0L I4 Hurricane 4 Turbo engine. The JB4 adds up to 60hp and 60tq to the wheels and is designed to unlock additional performance from your turbocharged engine while maintaining smooth drivability and factory engine safety systems.

The JB4 features a simple plug and play installation harness for easy installation & removal and includes many features not found with any other tune. Including on-the-fly in dash map switching between factory and various performance maps, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built-in data logging, built-in code reading, and much more.

Wirelessly Connect to your JB4: Our all-new JB4 PRO smartphone connection is included to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns. 

For more information about the JB4PRO mobile app click here.

Jeep Hurricane 4 JB4 Features & Benefits

• Power gains of up to 60hp and 60tq to the wheels on a stock vehicle
• Improves 0-60 and quarter mile times.
• Includes multiple tuning maps for different fuel types.
• Quick plug and play installation.
• Supports E85 ethanol blends.
• Reads and deletes fault codes.
• Displays and logs up to 40 engine parameters.
• Boost by gear control for improved traction.
• Controls exhaust flap operation on supported vehicles.
• Compatible with the free JB4PRO app.
• Offers better performance and safety than basic chip tunes.
• Full CANbus integration.
• Runs as smoothly as stock.
• Compatible with all driving modes.
• No impact on fuel economy during normal driving.
• Requires 91 octane or better for performance gains.
• Not VIN locked and fully removable.
• Includes billet aluminum enclosure.
• Designed and assembled in the USA.
• 5-year warranty.

Vehicle Fitment

Jeep Grand Cherokee (WL)

• 2026+ Jeep Grand Cherokee 2.0T Hurricane 4 Turbo (WL74), including Laredo Altitude, Limited, Limited Reserve, and Summit

Jeep Grand Cherokee L (WL)

• 2026+ Jeep Grand Cherokee L 2.0T Hurricane 4 Turbo (WL75), including Laredo Altitude, Limited, Limited Reserve, and Summit

Note: Fits only vehicles equipped with the new 2.0L Hurricane 4 Turbo gasoline engine. Does not fit 3.6L Pentastar V6, 2.0L 4xe plug-in hybrid, or other engine configurations.

What is a JB4?

The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can quickly be removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade and is sold in over 67 countries worldwide.

Is the JB4 a real tune?

Yes the JB4 is a real tune. By tapping into specific sensors and CANbus for real time vehicle data the JB4 is able to alter your boost, timing, AFR, and/or fuel trims, to a similar degree an ECU reflash would, but without the vehicle ever knowing its been tuned. The result is safe, smooth, and significant power and torque gains while retaining your factory safety systems and without having to unlock/flag your ECU.