How and when to remove your Derringer tuner.

Should I remove the Derringer and iDash before a dealer visit?

Whether or not you should remove your Derringer tuner depends on your relationship with your dealership and/or service writer. It’s helpful to know if they’re aftermarket accessory friendly. When in doubt, remove the Derringer module and engine harness.

Although it is illegal for a vehicle manufacturer to deny your warranty for no other reason than the mere presence of an aftermarket device, some dealerships do it anyway. If you are unclear on your dealership’s stance on aftermarket parts, follow the simple steps below to remove the Derringer module from your GM, Ford, RAM, or Jeep.

In most cases, it is not necessary to remove the iDash. The iDash should be considered a diagnostic device no different than the dealership’s factory scan tool. However, we do recommend unplugging the OBD cable, curling it up, and tucking it under the dash because the dealer will need the OBD port open to connect their factory scan tool.

Derringer Removal:

Step 1. When disconnecting and removing the Derringer, it’s best to disconnect both batteries. If this is not possible, you may get a check engine light upon restarting the truck. Simply use your iDash to clear the codes.

Step 2. Locate the Derringer module. It’s usually zip-tied to a steel body mount or tucked into the fender on the driver’s side of the engine bay. Once you’ve located it, cut the zip-ties holding it in place.

Step 3. Disconnect the round Starter Cable by turning the locking ring clockwise (to the right) with your thumb. You’ll see a padlock logo with an arrow to show which direction is lock and unlock. Once unlocked, pull the starter cable away from the Derringer module.

Step 4. Coil up the starter cable and zip-tie it out of sight.

Step 5. Unplug the Banks engine harness from the bottom of the Derringer.

Step 6. Trace the engine harness to its origin, cutting the zip-ties that secure it as you go. The cable terminates in a short Y. One end of the Y goes to the MAP sensor lead while the other end intercepts the MAP sensor lead.

Step 7. Disconnect all four connectors on the Banks engine harness. Reconnect the stock sensor plugs. For a detailed look at how the connectors work, watch the video above.

Step 8. Reconnect the negative terminal to your battery(s).

Step 9. Store the Derringer and Engine Harness in your garage, not your truck. Mechanics have been caught searching center consoles and glove boxes for loose tuning devices.

Step 10. Pretend not to be disappointed by your truck’s stock horsepower.