Don’t get duped! (See more) . The locker sensors in the Jeep Wrangler JL and Gladiator JT Rubicons can be problematic. Due to a factory defect of the locker sensor, you can end up with a “service axle locker” message . Once the locker system is in the fault state, the lockers will no longer engage. . Instead of replacing the sensor (and in most cases, the entire axle), the @z_automotive Z-Locker OEM solves the problem . The Z-Locker bypasses the problematic sensor, allowing the lockers to operat