By Brett Foote – November 25, 2015
This article applies to the Jeep Wrangler JK (2007-present).
While there are folks that swear resetting your ECU does absolutely nothing, it’s a common practice among automotive enthusiasts. The ECU (Electronic Control Module) “learns” your driving style and the parts in your ride by storing information in its memory, information that it gathers using a number of sensors located all throughout the vehicle. After installing new or performance parts, you can reset the memory in the ECU and force it to “relearn” the vehicle’s modifications and your driving style with just a few simple steps, which will allow you to take full advantage of the accessories you have added. Keep reading and we’ll walk you through the process for resetting the ECU.
- Adjustable wrench
Step 1 – Ground the battery cables
Pop the hood and disconnect the positive battery cable from your battery. Ground the positive battery cable to the negative battery cable for 30 seconds. This will erase the electronic charge in the capacitors, which is what retains the ECU’s memory. After 30 seconds has passed, reconnect the positive battery cable and shut the hood.
Figure 1. Remove the positive battery cable and ground it to the negative cable for 30 seconds.
Step 2 – Manipulate key and headlights
Insert the key in the ignition, but don’t start the vehicle. Turn the key to the “ON” position, then turn the headlights on and back off. Turn the key off. The ECU will be reset to factory settings at this point. Over the next 50 warm-up periods, the ECU will gather the necessary information involving your driving habits and the parts installed on the vehicle.