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GM GENUINE PARTS

GM Genuine Parts 213-3521 (12589867) Ignition Knock (Detonation) Sensor

Based on 2,272 reviews
Condition: New
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$53.78

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Availability: In Stock.
Fulfilled by Amazon
Arrives Saturday, Oct 31
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At a glance

Condition
New
Model
213-3521
Dimensions
2.7 x 2.7 x 2.3 in
Weight
2.88 oz
Material
Metal
Style
Modern
Maximum Supply Voltage
12 V DC
In the box
Ignition Knock (Detonation) Sensor
Warranty
24 Month / Unlimited Mile Limited Warranty on parts sold on or after 04/01/18. (Parts Only) Please seefor more details.

Features 4

  • GM recommended replacement part for your GM vehicles original factory component
  • Offering the quality, reliability, and durability of GM OE
  • Manufactured to GM OE specification for fit, form, and function
  • GM-recommended replacement part for your GM vehicles original factory component

Description

ACDelco GM Original Equipment Ignition Knock (Detonation) Sensors monitor the engine for pinging or spark knock, and are GM-recommended replacements for your vehicle's original components. These sensors create a voltage signal based on the vibrations caused by erratic air/fuel mixture combustion; the engine control module uses these signals to adjust the ignition timing and air/fuel mixture. These original equipment ignition knock sensors have been manufactured to fit your GM vehicle, providing the same performance, durability, and service life you expect from General Motors.

Specs 22

Brand GM GENUINE PARTS
Item dimensions L x W x H 2.7 x 2.7 x 2.3 inches
Material Metal
Item Weight 2.88 ounces
Style Modern
Maximum Supply Voltage 12 V DC
Mounting Type Flange Mount
Output Type Push Button

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Oct 31

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

they work!
Review Image by Uncle Adolfo
Review Image by Uncle Adolfo
Review Image by Uncle Adolfo
mounted externally on head bolt bosses on passenger cylinder head farthest from exhaust front and back sides acquired longer harness from michigan motorsports 2003 silverado 6.0 4wd 2500hd checked operation while driving with solus legend scanner its been months now no code left the "vortec" plastic cover off not needed ... show more
Reviewed in the United States on September 27, 2026 by Uncle Adolfo
Genuine GM quality—perfect fit with zero issues!
When replacing the knock sensors on these engines, sticking with genuine GM/ACDelco parts is the only way to ensure you don’t pull a code right after putting the intake back together. This sensor is an excellent, high-quality factory replacement part. The threads are clean, the fitment into the block valley is exact, and it torqued down perfectly. I paired these with a new wire harness, and the truck runs completely smooth with absolutely no check engine lights or sensor communication issues. If you are doing a top-end tear down, do not gamble on cheap aftermarket knock sensors. Spend the little bit extra for these genuine parts so you only have to do the job once! ... show more
Reviewed in the United States on May 16, 2026 by Brandon B.
Great OEM knock sensor at half the price of the local auto stores.
Review Image by Honest Reviewer
Review Image by Honest Reviewer
Review Image by Honest Reviewer
These knock sensors were a direct fit for my 2001 5.3L Chevy Silverado. They were shipped loosely bagged inside the amazon box with some air pillows but arrived undamaged. This is an area of concern that has been discussed however the parts arrived undamaged. One thing to note is that although this is an OEM part, the product is assembled and made in mexico. Upon installation however that did not seem to matter as the sensor performed as it should. These same sensors cost twice as much at the local auto parts store. Amazon had the best value with it being just slightly over another websites price but having two day shipping with prime. The knock sensor performed flawlessly at first start up and its been a week now with no problems. No more CEL :) Some things to note if you are performing the knock sensor job on a GM: Make sure you have an open weekend to perform this job, It will take upwards of 6-8 hours. As noted below, since the manifold will be off, now will be an excellent time to replace optional parts. You might also want to do additional maintenance such as cleaning the IAC, MAF and throttle body. Parts you will need: 2 Knock sensors (usually only the rear gets damaged but since this is a large job you might as well swap them both) 1 Knock sensor harness (The old one will be useless. The boot wont seal tight and the connectors will be brittle and likely break) 1 Intake manifold gasket (This is a given. You do not want to do this and have a vacuum leak after putting it all back together) 1 Throttle body to intake manifold gasket (You will problably unmount the throttle body for easier removal and cleaning) 1 RTV tube (High temp is preferred. This is used to create a dam and keep water from entering the knock sensor and corroding it) Miscellaneous Optional: 1 Bottle of Throttle Body Cleaner (While the whole manifold is off you may take this time to clean the throttle body thoroughly. 1 bottle of MAF cleaner (To clean the Mass Air Flow sensor and Idle Air Control Valve) Some Shop Towels: (You will be doing alot of cleaning of parts caked with grease/dirt/grime) Shop Vac: (No matter how careful you are chances are leaves or debris will fall into the cavities of the valves/knock sensor while removing the manifold. A shop vac makes quick haste of cleaning all this debris) Other parts to consider replacing while you have the manifold off: Valve cover gaskets w/grommets (This is a perfect time to replace the valve cover gaskets if you notice any small oil leaks) Heater Hose Quick Connectors: (These things are also notorious for breaking in alot of GM trucks near the firewall. If you have never replaced them, now would be a good time to replace them since you will have easy access to them) Note: I did not include any part #'s as they will vary per vehicle application. ... show more
Reviewed in the United States on September 17, 2016 by Honest Reviewer
Bad batch or bad autmotive lottery
These sensors did not work in my 04 avalanche 5.3. I bought a pair to replace a rusted out one and went to torque to the 15ft lbs and the top of both sensors spun on me. I tried them anyway and a few miles down the road while watching DTC's, immediately got codes for both sensors. Did a return and replace, got the new set in, same thing. The top spun before it could even be torqued and yet again, a few miles and the codes set again. Bought another pair of ACDelco's from the AZ, this time these torqued fine without the top spinning. Put everything back together thinking I was golden, nope... a few miles down the road again and the codes set. I then bought the cheapest sensors I can get cause at this point I have nothing to lose other then time, however, these gave the same result as the first two sets. Went to the AZ and got their house brand ones and lone behold, these actually work! I've gone 500miles and no DTC and the diagnostic tests actually passed this time. For grins and giggles, I tested the sensors with a oscilloscope multi-meter to look at the AC sine wave and test the resistance. The 3 sets of ACDelco's produced no AC sinewave but resistance was good. The cheap ones produced more AC than the ACDelco's but resistance was around 50k. I got a third sensor, the house brand, from the AZ and I got spikes of AC of around 5V which was a thousand times better than the other sensors and resistance was smack dab 100k. All it cost me was trying 5 sets of sensors and a lot of headache taking the plenum off and on but it comes to show that don't trust just the resistance of these sensors...thats only showing half the picture. Get yourself a cheap oscilloscope multi-meter and test them before you put them in to save yourself the headache. Also I am either bad at the automotive lottery or theres a bad batch of ACDelco sensors out but in the end I am very quick at swapping these out now. ... show more
Reviewed in the United States on April 2, 2024 by Jimmie Taylor
Knock senators
Worked great
Reviewed in the United States on August 18, 2026 by Dennis Harris
Worth the price
The only knock sensor that's going to work right for the truck and last long rest them didn't last week one month because lasted pretty well
Reviewed in the United States on September 13, 2026 by Mike
Easy install if you have any idea how to approach it.
This review is more to respond to the other reviews I have read about this. This repair is a money maker for GM dealers. It is super easy in comparison to how intimidating the job is. I read some review that said it should take a whole day. It is a 2 hour job unless you take a nap mid way through. Also, the gasket on the intake is completely reusable silicone which clips on the completely plastic intake manifold. DON'T BUY THE GASKET. There is a reason why the stupid gasket is almost $100, it's because it is high quality and reusable. The harness is also probably fine. I should also mention that I am not a super cheap person who would waste tons of time to save a couple bucks. Some of the reviews I read were just ridiculous. To perform this task you just need to peel all the wires and hoses off the intake and zip tie them up to the wiper blade, and pull the intake out from underneath. The gasket is clipped on to the plastic intake. Vacuum out the crap that is in the valley, clean it up, swap the knock sensors and slide the intake back on. The screws on the intake are delightfully captive to the assembly making re-assembly easy. Also to note is how the screw (little M6 things) have plastic boots where they go through the intake. These are also gasket surfaces, as they pass through the intake inside of the base gasket, but for some reason the reusable gasket reflexive replacing people seem to not identify this. Just because it is a gasket doesn't mean you have to replace it. Save the money, buy both sensors (even if you only need one) and nothing else. Have a shop vac on hand and a can of brake cleaner to clean up the gasket surfaces. Once you complete this job, doing it again is super easy should you ever have to. ... show more
Reviewed in the United States on June 17, 2019 by M
2002 gmc Yukon 5.3
Replaced knock sensors. Works as it should.
Reviewed in the United States on June 3, 2026 by james diven
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