Knock Sensor 2 Circuit Low (Bank 2)

Bank 2 knock sensor circuit low input. Same diagnosis as P0327/P0330 -- the sensor is under the intake manifold. Replace both knock sensors and the wiring harness (ACDelco) since the manifold removal is the majority of the labor. Torque to 15 ft-lbs. Use thread sealant on the sensor since it is near the coolant jacket. Your dealer can confirm whether an open service bulletin or warranty extension applies to your VIN. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

Bank 2 knock sensor low signal. The sensor is under the intake manifold on the VQ40DE. Replace both sensors together (Hitachi). These fail from heat cycling and coolant contamination. While the manifold is off, inspect the intake gaskets and coolant crossover for leaks. Torque the sensor carefully -- over-torquing causes erratic readings. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.

Bank 2 knock sensor low input on the older 5.3L/6.0L. The sensors and wiring harness are in the lifter valley under the intake manifold. Replace both sensors and the entire knock sensor harness (ACDelco). While the manifold is off, inspect the lifter valley for excessive oil sludge that may indicate oil change neglect. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.