Question about 2004 GMC Yukon

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How to repalce a knock sensor on my 2004 gmc yukon

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Hi welcom to fixya. A defective knock sensor may cause engine detonation or reduced spark advance and fuel economy. When a knock sensor is removed and replaced, the sensor must be tightened to its specified torque. If the knock sensor is installed tighter than it should be, it may become too sensitive and provide an excessively high voltage signal, resulting in more spark ****** than required. When the knock sensor is installed looser than it should be, the knock sensor signal will be lower than normal, resulting in engine detonation.
To replace the knock sensor:

  • Disconnect the knock sensor wiring connector.
  • Then, unscrew the sensor.
  • Remove the knock sensor.
  • Reverse the procedures to install the part.
  • 15 ft.lbs.torque
  • hope this helps.Thank You for using fixya..iluv2fish.. Ray..

Posted on Jul 09, 2010

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Knock sensor is located on side of engine block screwed into a block coolant drain, your best access is from underneath the vehicle. Coolant will run out when you unscrew it so be sure the engine is cool. Just unplug the wire unscrew the sensor, screw in the new one and plug the wire back in. Also be sure to top off the radiator if you loose any coolant.

There are some model yukon engines ( big V 8's) that have the Knock sensor(s) 2 that are under the intake manafold. the one that goes bad in those type of enines is the front one. Must remove the intake manifold.

how to repalce a knock sensor - 9e5bce4.jpg

Fig. Right engine compartment view-4.8L, 5.3L, 6.0L and 6.2L engines (1) Ignition Coil 8 (2) Ignition Coil 6 (3) Ignition Coil 4 (4) Manifold Absolute Pressure (MAP) Sensor (5) Throttle Body (6) Ignition Coil 2 (7) Knock Sensor (KS) (8) Crankshaft Position (CKP) Sensor (9) Engine Oil Level Switch (10) Starter (11) Valve Lifter Oil Manifold (VLOM) Assembly (12) Engine Oil Pressure Sensor



258ce78.jpg

Fig. Front engine compartment view-4.8L, 5.3L, 6.0L and 6.2L engines (1) Throttle Body (2) Manifold Absolute Pressure (MAP) Sensor (3) Evaporative Emission (EVAP) Canister Purge Solenoid Valve (4) Knock Sensor (KS) (5) Engine Block Heater (6) Engine Coolant Temperature (ECT) Sensor (7) Camshaft Position (CMP) Sensor (8) Generator

Good luck.



Posted on Jul 09, 2010

  • russen Oct 09, 2010

    what is the normal labor(hrs) for replacing on a GMC Yukon?

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Posted on Jan 02, 2017

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SOURCE: trying to find out where a knock sensor is located

There are 2 knock sensors on some of those, one screws into the block drain near the starter the other near the left exhaust manifold.

Posted on Jan 24, 2010

  • 10 Answers

SOURCE: how do i change the knock sensor on 2004 gmc yukon

The person who stated they are under the intake manifold is a tool! They are located below the exhaust manifold(one on each side) and are quite simple to replace. Be sure not to overtighten them as they can become too sensitive and may cause detonation. Should be about 16 ftlbs but I would check to be sure. They run about 55 dollars each aftermarket and are about 85 from GM depending on where they are purchased from.

Posted on Oct 17, 2010

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1 Answer

I nedd to check code p0332


code po332 knock sensor 2 cicuit low bank 2

Apr 09, 2012 | 2004 GMC Yukon

2 Answers

How do i change the knock sensor on 2004 gmc yukon and where is it located


The person who stated they are under the intake manifold is a tool! They are located below the exhaust manifold(one on each side) and are quite simple to replace. Be sure not to overtighten them as they can become too sensitive and may cause detonation. Should be about 16 ftlbs but I would check to be sure. They run about 55 dollars each aftermarket and are about 85 from GM depending on where they are purchased from.

Sep 08, 2010 | 2004 GMC Yukon

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I have an engine code PO332 knock sensor 2 circuit low imput bank 2 what is this problem .the car is a 2001 gmc yukon xl .


The most likely cause of your code is a bad rear knock sensor. You should check the knock sensor wiring harness for corrosion. But if that checks out the sensor will have to be replaced. The knock sensor is under the intake manifold, although it's not too difficult to remove. Both knock sensors should be replaced along with the wiring harness, just because of labor involved in gaining access to the sensors. You could try clearing the code, it may stay off for a long time.

May 23, 2010 | 2001 GMC Yukon XL

1 Answer

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Not the knock sensor
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May 14, 2010 | 2004 GMC Yukon

2 Answers

Wanting to know how to change knock sensor on 2001 gmc yukon


Knock sensor is located on side of engine block screwed into a block coolant drain, your best access is from underneath the vehicle. Coolant will run out when you unscrew it so be sure the engine is cool. Just unplug the wire unscrew the sensor, screw in the new one and plug the wire back in. Also be sure to top off the radiator if you loose any coolant.

Mar 11, 2010 | 2001 GMC Yukon XL

2 Answers

Trying to find out where a knock sensor is located on a 2004 gmc yukon


There are 2 knock sensors on some of those, one screws into the block drain near the starter the other near the left exhaust manifold.

Jan 24, 2010 | 2004 GMC Yukon

1 Answer

Where is locate the knock sensor in 2004 yukon xl


There are 2 or them and they are under the intake manifold. The manifold has to be removed to replace them.

Oct 10, 2009 | 2000 GMC Yukon XL

2 Answers

I have a 2004 gmc yukon when I try to start it it just cant kick over, the battery is fine it just cant get the final kick to start


Check the "knock sensors" under the intake manifold, notorious for water damage. Need to check the fuel pressure as well. Fuel pump could be bad. Has the "Service Engine Soon" been on at all? It's all a "**** shoot" without the proper testing equipment.

Dec 15, 2008 | 2004 GMC Yukon

1 Answer

2003 GMC Yukon


You will have to remove the intake manifold to gain access to the knock sensors. There are two sensors in the valley under rubber plugs. The sensor in the rear has a tendency to fill up with water and cause trouble. You have to make a dam with RTV to stop the water from getting in there.

Sep 06, 2008 | 2003 GMC Yukon

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