2004 GMC box truck reset check engine?

To reset the check engine light on a 2004 GMC box truck, you can disconnect the negative battery cable for about 10-15 minutes, which clears the engine control module's stored codes. Alternatively, you can use an OBD-II scanner to erase the diagnostic trouble codes directly. However, it's important to address any underlying issues that triggered the check engine light before resetting it to ensure the problem doesn't persist. Always consult the vehicle’s manual for specific procedures related to your model.