If your 2011 Chevy Camaro is experiencing a no crank no start issue when the key is in the "on" position, there are several potential causes you can check on your own before seeking professional assistance.

1. Battery: Start by checking the battery condition. Make sure the battery terminals are clean and tightly secured. Check the battery voltage with a multimeter. Ideally, the voltage should be around 12.6 volts or higher. If the battery voltage is low, it may need to be charged or replaced.

2. Ignition Switch: The ignition switch could be faulty and preventing power from being sent to the starter. Try wiggling the key while in the "on" position to see if there is any change. If there is, it could indicate a problem with the ignition switch. Consider replacing it if necessary.

3. Starter Motor: The starter motor is responsible for cranking the engine. If it's faulty, it won't engage and start the engine. You can try tapping the starter motor with a hammer while someone attempts to start the car. If it starts, the starter may be sticking and require replacement.

4. Starter Relay: The starter relay is a small electromagnetic switch that directs power to the starter motor. If the relay is defective, it may prevent power from reaching the starter. Locate the starter relay in the fuse box and check if it's functioning correctly. Swap it with a known working relay to test.

5. Neutral Safety Switch: The neutral safety switch ensures that the vehicle can only be started in neutral or park. If the switch is faulty or misaligned, it may prevent the engine from cranking. Try moving the gear selector through its range while attempting to start the car. If it starts in a different position, the neutral safety switch may need adjustment or replacement.

6. Security System: In some cases, the vehicle's security system may malfunction and prevent the engine from starting. Check if any anti-theft or security warning lights are illuminated. Try unlocking and locking the car with the key fob or manually using the key to reset the system.

If you've checked these potential causes and are still unable to resolve the issue, it's recommended to contact a professional mechanic or Chevrolet dealership for further diagnosis and repair.