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Replacing knock sensor on 2001 GMC 5.3L engine

What is correct procedure to do this work ? Any precautions ?

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Just remove the old one, install the new one. Be careful not to damage the electrical connector when you disconnect it.

I'd disconnect the negative battery cable first.

Posted on May 29, 2009

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Posted on Jan 02, 2017

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How do you change a knock sensors on my 2001 gmc 1500hd


Changing knock sensors on 2001 GMC 1500hd
1. Remove the intake manifold.
2. There are 2 sensors located on a plate under the intake manifold. These are the knock sensors.
3. Remove the wiring harness assembly from the knock sensor.
4. Install the new rear bank knock sensor and tighten to 15 lb ft.

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My 2000 yukon knock sensor code came up. the shop said $ 700 to replace. the 5.3 motor runs great. Does this need replacing?


the engine has two knock sensors they are mounted under the intake manifold, $700 sounds a bit high , i think i would price around, as to the question do you have to replace them, NO, but they are there it aid in the ignition control if the engine spark knocks these sensors are there to sense this. and also if one of the sensors is always reading as if the engine is spark knocking then the on-board computer will keep trying to ****** the timing and this will effect you power, and fuel millage.

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2001 acura cl Type s ... engine bucking on accelaeration and check engine light came on. replaced coil and all sparkplugs. Problem sort of corrected but subtle shake at accelaration at 80 kms per hr, and...


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How to repalce a knock sensor on my 2004 gmc yukon


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..

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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

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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.

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Replacing the knock sensor in a 2002 subaru forester.....


Disconnect the negative battery cable first. Better to be safe in case something arcs.

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The knock sensors either work or they don't. When they do not, the light comes on. All that a knock senor is is a piezo crystal that vibrates at the frequency that is comparable to engine "knock", and sends that yes/no signal to the ECU. There are 2 knock sensors, and both are bolted to each side of the engine interior walls, under each cylinder head. You have to remove both of the intake manifolds to access the knock sensors and their wiring.
Price to pay? My flat rate book suggests 3.7 hrs to change both. 3.7 hrs times your local labour rate, plus the price of the 2 sensors and/or wiring, and the price for the gaskets for the upper & lower manifolds. Depending on your location, you could quickly spend over $500.00.

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