Locate your cam shaft sensor location, it'* on the right side of your engine between your water pump pulley and your harmonic balancer, just to the rear of those.



If you remove your water pump pulley you will be able to see what your doing.
https://www.gmforum.com/showthread.p...26#post1407726

Here is a close up of what it looks like.


Unplug the sensor.

Remove the one bolt.


Give it a little twist and a pull and it will come right out.


When putting the new sensor in you will notice a rubber O ring. Use a little lube on the O ring and insert the new sensor. Replace the bolt, put the plug back, and replace the water pump pulley and belt.