The camshaft position sensor on a 1999 GMC Sierra with the 4.3L V6 engine is located on the rear, passenger side of the cylinder head, near the top.
Additional information:
- The sensor is a black cylindrical-shaped component with two electrical connectors.
- It may be difficult to see due to its location and could possibly require a flashlight for visibility.
- The camshaft position sensor is responsible for providing the Engine Control Module (ECM) with information about the position of the camshaft.
- Replacing this sensor may require disconnecting electrical connectors and using a wrench or socket to loosen and remove any holding bolts.
