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When the check engine light illuminates in your Chevy Silverado, it is crucial to cease driving immediately. Continuing to drive with the check engine light on can pose a risk of further damage to your vehicle. Once you have come to a stop, use an OBD II scan tool to retrieve the code stored in your truck's electronic control unit (ECU). If the code reads as C342D, it indicates a potential issue with either the throttle position sensor or the idle air control valve. If your engine is exhibiting rough running and stalling, this is typically a symptom of a valve issue. On the other hand, if you notice the vehicle running rich, it is often indicative of a sensor malfunction.
The c342d code on your Chevy Silverado signals that there are problems with the throttle position sensor and idle air control valve. It is recommended to consult a trustworthy auto repair shop for a diagnosis.