6.7 Cummins GT Bypass Cable Kit – Bully Dog 42215

Unlock full compatibility for the Bully Dog GT Diesel tuner on your 2018+ Ram 6.7L Cummins.

The Bully Dog 42215 GT Bypass Cable Kit is required to properly install and operate the Bully Dog GT Diesel (Part #40420) on 2018 and newer Ram trucks equipped with the 6.7L Cummins engine. Newer Cummins ECMs need this specialized bypass cable for reliable communication and safe tuner operation. Once installed, the cable stays in place for ongoing use with the GT Diesel.

Key Features

• Required accessory for Bully Dog GT Diesel (40420) on 2018+ 6.7L Cummins applications
• Enables full tuner functionality, performance levels, monitoring, and diagnostics
• Cable remains permanently installed after setup
• Simple plug-and-play installation
• Designed exclusively for use with the Bully Dog GT Diesel

Fitment

2018+ Ram 2500 / 3500 (and related chassis) with 6.7L Cummins diesel.

Notes:

• A different unlock cable is required for 2013–2017 Cummins models.
• No special cable is needed for trucks prior to 2013.
• Always use the bypass OBD-II block and cable included with this kit. Do not use the standard OBD harness that ships with the GT Diesel — incorrect cabling can damage the vehicle’s ECM.

This essential kit lets you take full advantage of the Bully Dog GT Diesel’s power, torque, monitoring, and tuning features on late-model Cummins trucks.