You can reset your Jeep Wrangler’s trouble codes right in your driveway if you have a socket set. The engine control module (ECM, a type of computer) in the Wrangler keeps track of the engine and its sensors. Other sensors positioned throughout the vehicle keep track of other mechanical and electrical functions of the Wrangler. When the sensors detect an abnormality, the ECM sends a trouble code that illuminates a warning or service-required light on the Wrangler’s instrument panel. Once you’ve had the Jeep repaired or serviced, you or your mechanic can reset the codes, shutting off the instrument panel warning light.
Open the Wrangler’s hood and prop it up with the support bar.