If you see an illuminated or flashing lightning symbol (red or yellow) in your car, the ETC warning light is on and requires attention. Your best recourse is to scan the system and determine the source of the fault code. A faulty throttle sensor, a malfunctioning pedal, or a dirty or bad throttle body could all trigger the ETC warning light.
When the throttle body has excessive carbon buildup, symptoms like poor idling, hard starting, or weak performance may accompany the ETC warning light. Experts recommend cleaning the throttle body every 75,000 to 95,000 miles or earlier to prevent carbon deposits. Servicing the throttle body is not for the faint of heart, but knowledgeable enthusiasts could do the job on a quiet weekend using some tools, rags, and a spray cleaner.
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Meanwhile, if the ETC warning light remains illuminated after cleaning the throttle body, the next step is to ensure the gas pedal and other sensors are working. Moreover, inspecting the wiring and checking for software updates (when applicable) are worth looking into. Replacing a faulty gas pedal would cost $400 to $500 or more (depending on the make and model of your vehicle), while a new sensor will run anywhere from $150 to $300.
