What happens when an Electronic Throttle Body fails When an Electronic Throttle Body fails the controlling module will illuminate the MIL/SES/CEL the module will then activate a fail-safe mode operation and gradually reduce the engines speed back to an idle rpm. What causes the Electronic Throttle Body to fail The most common failure in an Electronic Throttle Body is the integrated Throttle Position Sensor. The ETB is equipped with high and Low voltage reference Throttle Position Sensor for redundancy. Either one of these sensors could fail or possibly both.
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