Harness

4.6L. This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors

Knock Sensor

Sends signals to the engine control module (ECM) to adjust timing Helps prevent damage to the engine caused by pre-ignition

Camshaft Sensor

All. 4.6L. 4.4L. Helps keep engine timing and fuel injection running in sync Helps provide proper alignment, positioning, and spacing for easy installation Synchronizes engine valves and pistons for excellent engine performance

ECM

This part requires programming and/or special setup procedures GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle Dictates the operation of your vehicle's vital systems, which is critical to the performance of your vehicle This GM Genuine Part is designed, engineered, and tested to rigorous standards and is backed by General Motors