2013 Jeep Engine Light. When the engine warning light illuminates on the instrument panel, this is the result of a trouble code sent to the PCM. The following are warning lights and indicators found in vehicles built by Jeep.

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Check engine light -- click for more: Sway bar fault. Because along with your Jeep check engine light coming on, other signs of ignition coil failure include rough idle, engine misfiring, poor emissions, a reduction in power or the car simply not starting. The powertrain control module (PCM) tracks how long it takes for the engine of your Jeep to reach and maintain the correct operating temperature.

Yesterday the check engine light came on.

It comes without warning and with no explanation.

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When the correct engine operating temperature is reached, the powertrain control module orders the fuel system to enter "closed loop. It is constant and has been on since it flashed on the dash yesterday morning. Coolant thermostat temperature below regulating temperature.