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Jeep JK AEV ProCal Module 2007-11 Functions :Large tire recalibration (Restores the vehicle's speedometer/odometer accuracy following the installation of larger-than-stock tires) Axle gear ratio recalibration (Resets automatic transmission shift points to maximize the benefits of an axle gear ratio change) Tire Pressure Monitoring System recalibration Daytime running lamp activation/deactivation, and lamp location selection One-touch turn signal activation/deactivation Engine idle speed options (Improves winch performance and battery charging capabilities by temporarily increasing engine idle RPM) Steering wheel centering (Provides for spot-on steering alignment) Clears Engine Diagnostic Codes. $100