Document ID: 3228855

Callout	Component Name
Preliminary Procedures Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
1	Heat Shield Fastener (Qty: 3) Caution: Refer to Fastener Caution.
2	Heat Shield
3	Knock Sensor Fastener Tighten 23 Nm (17 lb ft)
4	Knock Sensor Procedure Disconnect the knock sensor electrical connector.

Document ID: 2665119

Danger: To avoid any vehicle damage, serious personal injury or death:

When major components are removed from the vehicle and the vehicle is supported by a hoist, support the vehicle with jack stands at the opposite end from which the components are being removed and strap the vehicle to the hoist.
When performing work in the engine compartment or under the vehicle, ensure that the hood is fully open, or opened to its secondary latch. When the hood is opened to the secondary latch, the vehicle will disable the remote start features from the key fob and OnStar mobile app. Failure to open the hood, or open the hood to the secondary latch while doing a repair in the engine compartment or under the vehicle can result in inadvertent vehicle starting which could result in personal injury or damage to a vehicle.

Warning: Refer to Safety Glasses Warning.

Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.

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Disconnect the wiring harness retaining clip.
Remove the knock sensor electrical connector (3) from the knock sensor (2).

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Remove the sensor retaining bolt (1).

Caution: Refer to Fastener Caution.

Install the knock sensor (2) to the engine block and tighten the retaining bolt (1) to 23 Nm (17 lb ft).

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Install the knock sensor electrical (3) connector to the KS.
Lower the vehicle.

Operation	Task	Skill	Hours
Remove & Replace	Powertrain Control · Knock Sensor, R&R · One Bank	B	0.5
Remove & Replace	Powertrain Control · Knock Sensor, R&R · Both Bank	B	0.7

Knock Sensor