Hummer 12623730 Sensor Assembly, Knock

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To remove the knock sensor on a vehicle, loosen the front wheel lug nuts and raise the front of the vehicle on jack stands. Remove the wheel and the knock sensor heat shield retaining bolt. Disconnect the electrical connector and remove the retaining bolt to take out the knock sensor. The installation is the reverse of the removal steps.

A pair of knock sensors is set up on either side of the block; they are located at the upper middle region of each block side, just below the exhaust manifolds. For V6 models, lift the front of the vehicle and safely support it on jackstands. While removing the knock sensor from the rear cylinder bank (bank 1) on a 3.9L V6 engine, detach the catalytic converter. Unplug the electrical connector housing from the knock sensor. When taking off either of them, remove its electrical connector as well as retaining bolt in case of a V6. Loosen knock sensor attaching nut and take out sensor. The reverse is true for installation; furthermore ensure that you have tightened down your sensor attaching nut for good measure . With reference to V8 models empty cooling system.You should raise front-end of car and secure it using jack stands.Disconnect knock sensor electrical plug.On a V8 engine, if you would like to remove a knock sensor first unplug its electrical connector then unscrew retaining bolt.Remove knock sensing unit retentive boll and withdraw sensing unit.Remember to tighten bolt after installing this kind of component.Pour coolant into system again.

To remove the knock sensor, start by disconnecting the cable from the negative battery terminal. Then, raise the vehicle and support it securely on jackstands. If you're working on a 3.0L or 3.6L V6 model, remove the starter motor. For 2013 and later 3.6L models, the left-side knock sensor is located between the oil filter and the starter motor. If you're removing a knock sensor from the rear of the engine, remove the right catalytic converter. Next, disconnect the knock sensor electrical connector. Finally, unscrew the knock sensor retaining bolt and detach the sensor from the engine block. To install the knock sensor, simply reverse the removal steps and be sure to tighten the bolt to the specified torque.

After removing the intake manifold, you should unplug the knock sensor electrical connector.

By reducing spark knock, the engine can use maximum spark advance, which improves driveability.

For installation, follow the reverse of the removal steps.Make sure to tighten the knock sensor or knock sensor bolt to the specific torque specified for your vehicle.

Simply reverse the removal steps and be sure to tighten the bolt to the specified torque.

On 5.0L, 5.7L and 7.4L V8 engines, the knock sensor is located on the right side of the block, just ahead of the starter motor. It can be unscrewed and removed.

The knock control system is designed to reduce spark knock during periods of heavy detonation.

A 4.2L six-cylinder engine has two knock sensors.

Also remove the right wheel well splash shield and starter motor.

Disconnect the electrical connector from the knock sensor and remove the retaining bolt to take out the knock sensor.

The 2009 GMC Yukon has 2 knock sensors, one one each side of the block.

Looks like 12623730 is the part number for both knock sensors per VIN