A GT Diesel install on a 2013-2017 6.7L Cummins stops if the special unlock cable is missing. Use Bully Dog 42214 for that step, and do not substitute the 2018-2021 bypass cable. Confirm the model year before you order, because sellers do not agree on the last year this cable covers.

• Build: This is an unlock cable for the GT Diesel, not the tuner and not a tune file.
• Part number: Bully Dog 42214. The current GT bypass-cable page says a special unlock cable is required for GT Diesel on 2013-2017 Cummins applications, and that no special cable is needed before 2013. That page does not print the number 42214.
• Fits: The range this listing can support is 2013-2017 6.7L Cummins trucks using GT Diesel part 40420. That range comes from Bully Dog's unlock note, not from a 42214 product page. Retailer lists run from 2013-2014 through 2013-2018, so confirm the truck.
• Does not fit: Not a 2018-2021 Ram. Those trucks use bypass cable 42215, and that cable stays installed. Do not treat 42214 as the stay-in cable. Not a truck from before 2013.
• Not in the box: No GT tuner. Part 40420 is separate.

Order today to secure your replacement. Confirm the truck is a 2013-2017 6.7L Cummins and that 42214 is the unlock cable your GT Diesel asks for.