Jeep Cherokee
 Owners Manual
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.

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. Although your vehicle will usually be drivable and not need towing, see your authorized dealer for service as soon as possible.


  • Prolonged driving with the MIL on could cause further damage to the emission control system. It could also affect fuel economy and driveability.

    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.

Loose Fuel Filler Cap Message

If the vehicle diagnostic system determines that the fuel filler cap is loose, improperly installed, or damaged, a "CHECK GASCAP" message will be displayed in the Electronic Vehicle Information Center (EVIC) or Driver Information Display (DID). Refer to "Electronic Vehicle Information (EVIC) or Driver Information Display (DID)" in "Understanding Your Instrument Panel" for further information. Tighten the fuel filler cap until a "clicking" sound is heard. This is an indication that the fuel filler cap is properly tightened. Refer to "Onboard Diagnostic System" in "Maintaining Your Vehicle" for further information.

    More about «Maintaining your vehicle»:

    Engine compartment

    Onboard diagnostic system - obd ii

    Emissions inspection and maintenance programs

    Replacement parts

    Dealer service

    Maintenance procedures


    Vehicle storage

    Bulb replacement

    Fluids, lubricants, and genuine parts

    Jeep Cherokee Owners Manual / Maintaining your vehicle / Onboard diagnostic system - obd ii

    Jeep Cherokee Owners Manual


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