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If the check engine light comes on in your Chevy Cobalt, it's best to pull over right away and avoid driving further. Continuing to drive with a lit check engine light can cause damage to your vehicle. Once stopped, use an OBD II scan tool to retrieve the stored code in your car's computer system. If you see the code C342D, it indicates an issue with the throttle position sensor. Typically, you'll experience delayed acceleration from the engine as this component starts to fail. You might also observe that the throttle does not correspond correctly with the position of the accelerator pedal.
The code c342d on a Chevy Cobalt indicates a malfunction with the throttle position sensor.