I went to the supermarket, and on my way back, I heard a ratcheting noise. Then, the engine light came on; the truck idles fine, and the noise only happened when I take off. I immediately parked the truck in front of my house, and I'm not using it until I can fix this. The code is P0022 A Camshaft Position over - Retarded Bank 2. Any help will be greatly appreciated. The noise is not very loud, I have to lower the window to hear.

THx
Pete