Okay, so you’ve got your new EFILive AutoCal and you’re ready to unlock the power in your Cummins. Before you even think about plugging it in, there are a few simple but important rules you need to follow to make sure the EFILive AutoCal V3 installation goes right and you don’t end up with a very expensive paperweight. A guide from Dirty Diesel Customs lays out the shop-proven process.

Don’t Brick Your ECM

The single biggest mistake people make is not using a good battery charger. Jordan “Phelps” Larue from the shop explained that it’s the most common reason for a failed flash. “One of the main issues that we see with a lot of files that end up failing is they don’t have a good battery charger on the truck,” he said. The risk is severe. He warned that if the truck’s voltage drops during the process, it can cause engine control module (ECM) failure or totally ruin the tune file. A stable power supply is non-negotiable at this point.

The EFILive AutoCal V3 Installation Process

With the truck on a charger, the process is straightforward but requires attention to detail. First, always plug the AutoCal tuner directly into the factory OBD2 port, never into the new port that comes with the switch. Once you navigate to the Program Full screen, the next critical step is to verify the file. “You’re going to want to check that the six digits and the tune file match the last six digits in your VIN to verify it’s the right file for your vehicle,” Larue instructed. He also noted that owners of 2008–2012 trucks should be aware that they might need to load a separate boot patch file first.

Getting The Switch Mounted

Installing the physical CSP5 switch involves drilling a 3/8-inch hole in a dash panel. Before you tighten it down, you have to manually set the number of tune positions by moving a small lock pin inside the switch—four for 2013–2018 trucks and five for other years. Larue also gave a helpful tip for tightening the nut: “Keep in mind that the threads are plastic and if you go too tight they will strip out.” The wiring includes a clever pass-through that replaces the factory OBD2 port, making for a clean final installation.

The Final Check

The whole EFILive AutoCal V3 installation is simple, but it’s unforgiving if you miss a step. Just remember the big three rules: use a battery charger, plug into the factory port, and double-check your VIN against the file. Get those right, and you’ll be ready to fire up a much more powerful and responsive truck.