2012 Jeep Grand Cherokee Owner Manual SRT - Page 518

516 MAINTAINING YOUR VEHICLE ONBOARD DIAGNOSTIC SYSTEM - OBD II Your vehicle is equipped with a sophisticated onboard diagnostic system called OBD II. This system monitors the performance of the emissions, engine, and automatic transmission control systems. When these systems are operating properly, your vehicle will provide excellent performance and fuel economy, as well as engine emissions well within current government regulations. CAUTION! • Prolonged driving with the MIL on could cause further damage to the emission control system. It could also affect fuel economy and drivability. The vehicle must be serviced before any emissions tests can be performed. • If the MIL is flashing while the engine is running, severe catalytic converter damage and power loss will soon occur. Immediate service is required. If any of these systems require service, the OBD II system will turn on the "Malfunction Indicator Light" (MIL). It will also store diagnostic codes and other information to assist your service technician in making repairs. Al- Loose Fuel Filler Cap Message If the vehicle diagnostic system determines though your vehicle will usually be drivable and not that the fuel filler cap is loose, improperly need towing, see your authorized dealer for service as installed, or damaged, a loose gascap indicator soon as possible. will display in the EVIC telltale display area. Refer to "Electronic Vehicle Information Center (EVIC)" in "Understanding Your Instrument Panel" for further information. Tighten the fuel filler cap properly and press