Knock Sensors replaced and still getting codes P0327 & P0332

Automotive teaching

[Kraven]

I relocated mine to bank 1 side of head there’s two empty threaded holes above the manifold (remove heat shield ) one by cylinder 3 and 5 I believe no more knock sensor codes I used sensors and a harness from 1a auto. I did this job 3 times all with AC delco parts and had the same codes each time with 100 ohm readings. So far this is working

[manuelvillalpando]

I’m having the same problem with a 2004 Chevy Suburban. I’ve also seen a few people here on YouTube state that they were still having the same error code for the knock sensors even after they replaced the knock sensors with new ones. One person said that they solved the problem by using an electrical cleaning spray and cleaning the connectors in both the knock sensor harness and the connectors to the ecm too. I’m going to try and clean the connectors out with an electric cleaning spray and then follow up with everyone if this works.

Update: The electrical cleaning spray did fix the knock sensor low input fault that I had on my Suburban. I simply disconnected the battery, removed the two color connectors from the ECM, removed the ECM from the mount, inspected all male and female electrical connections, sprayed the electrical spray cleaner a couple of times and scrubbed using a pipe cleaner brush, and allowed 15 to 30 minutes for the cleaning solvent to dry before assembling everything again. I did find that some pins on my ECM were covered in green grime and some other ones were white. But after the cleaning process everything seems pretty good now. I did have issues getting the rubber seals between the ECM and connectors to sit in place correctly, this caused my vehicle not to reset the ECM properly. But after removing the rubber sealing gaskets completely off the ECM did reset itself properly and the vehicle started up fine again. The last part was frustrating and a hassle, as I thought that I might have had damaged the ECM during the cleaning process but the culprits were the rubber gasket seals. I’ll just have to be really careful and mindful from now on to try and not get water into that region from now on, and clean up the ECM and connectors often.

[luckyme]

Thank you so much… Replace my knock sensors on a 2000 Silverado 3.5…. Kept getting knocked sensor code… I took the wiring harness off of the ECM, cleaned all the connections, erased all the codes, the code has not come back, but it’s only been one day, so we’ll see in about a month….. again thank you for sharing your video

[scottsatterthwaite]

99% of these sensors are made by the same factories in China, even the GM (AC/Delco) branded ones. The key is to test the new sensors BEFORE you install them (that 95 - 107 ohm between the pin and the metal body of the sensor) and make sure you DO NOT over-tighten them and twist the sensor inside the body, which can break the electronics.

[jeremypilot]

I read somewhere that GM has a weird learn cycle for these knock sensors, after replacing them you are supposed to rev the engine to 4000-5000 RPM and hold it there for 3 seconds, then repeat once more. That will learn the ECU.

[gdlkinbi]

So you think the manifold removal is bad on your Silverado ?
Try that on my Camaro instead then talk, lol, I have the same condition you have only I know my sensors are fine after swapping the 19y.o corroded units last autumn, new harness, 2 ACD sensors and JB Weld engine RTV.
I even checked all the ground cables then soldered my old still working harness to some 100k Ohm resistors to simulate a perfect knock sensor, connected then drove and still got both damn codes this morning🤯
Now after taking apart my PCM today I'm pretty sure it's a ground issue somewhere that I'll have to find.

Kudos for taking apart that whole harness man, that looks like a pure desperation move...I hope it doesn't come to that with my impossible to work on engine bay.

Thanks for the video👍

[taintedsasquatch]

Pro tip, never probe the connector backbrobe from the wire side, you can easily creat another circuit problem by spreading the terminal.

[victoraberdeen]

Have you considered the possibility that the engine may be experiencing a real knocking condition.If that is so then the light will not turn off.

[Cheater]

I know this is an old video just wanted to share what I'm going through. I have a 2002 Saturn SC1 I'm getting code p0327. The symptoms I am having is the car jerking especially at lower speeds. Its a manual. losing power and the RPMs reving up on their own. I bought a brand new knock, replaced the wiring that goes from the knock sensor to the computer. am still getting that code and two new ones as well.

[richardplatko]

I've wondered if the injectors can cause it my problem started from the rear one which normally rust causes the fail. After I replace them the codes are now two of them 332 and 327. The 327 wasnt present until repair. Although 332 was always present.

[fiveninegarage]

Did you ever solve this? I have issue where they both come on but if I delete the code with key on they don’t come back. It’s only when I reset pcm that it comes back

[ADYU]

May 26 2024, hello, I have 2006 gmc 1500 Savana 5.3 L v8 . I have replied the knock sensor 2 x now . After driving 2000 miles the code po332 Knox/combustion vibration sensor 2 circuit low bank 2 . Why ?

I have cleaned the pins that connects to ECM and 2 wires come from harness that connects to Knock sensor connector . ( if this code come up I well just replace new pins and wires and not use the old wire in the harness)

I checked the continuity it is closed and good .

Question is ; how do I check the voltage of ECM ?
Also do I need to check if the new knock sensor is readin the knock from the motor three the wire to ECM . If o do how do I do this using a, Etekcity ( brand ) multimeter ?

What is the right voltage ? When it listen for the knocks, what is it supposed to read ?

[electric]

If you're still getting codes after replacing knock sensors and clearing with scanner try resetting the ECM/ECU that's the only thing that I found to work.

[smokingmeatanddiybydaniel]

I back again, I replaced, AGAIN for the fourth time,

used ac delco knock sensors,
15 ft lbs of torque
and use a GM wire harness, tested both sensors after installed,
when I meter the knock sensors, I get .2 ac volts, when I tap on block this reading goes up to 8-12 ac volts
so I assume the knock sensors are working ok, that reading was straight on top of sensors, then hooked up the gm harness
and got about the same reading
so I put everything back together,
and about 100 miles later, the dreaded p0332 and p0327 came back on, I have tried everything, and I don't know what to do anymore, so at a loss for words right now, I even check for resistance going to the pcm, it seamed fine

why why why is this such a headache

[keithhoofard]

These knock sensor issues are utter hell. Replaced both 10 months back (one tested bad) with random aftermarket sensors and new plug harness (shortly after a new computer and whole new vehicle wiring harness was put in for unrelated issues). Those sensors appeared to fail a month apart, based on code (didn't test). I just redid the whole job with OEM to be sure, but pending low voltage codes again appeared for both sensors after the first drive cycle. Both read 100K ohms, so reasonably sure I got the connectors firmly seated on each sensor. So now I'm wondering if the first set of replacement sensors weren't actually bad, and it's something else entirely?

[exoticricket]

Im bouta just sell this truck tired of always having something wrong with it and same problems coming back

[benslaying]

just paid around 700 to have my knock sensors replaced in a 2004 chevy silverodo 4x4 v8 and not even a day later the codes came back what could this be

[smokingmeatanddiybydaniel]

I'm having the same issue with a 2001 Silverado, changed both knock sensors with acdelco and new wire harness and still getting the p0327 and p0332 codes, did you ever solve your issue ? if so I need help with mine

[jimgordon]

I keep getting a 327 and 332 code. I’ve replaced both knock sensors and the harness with GM parts. Both show 20 volts from the computer and 99 oems. Both respond to tapping on the exhaust manifolds with voltage ranging up to about 300 microvolts I think. What am I missing? An ideas? Please help

[scoobycrush]

I'm having same issue with my 1997 Saturn SC2. They've replaced three different knock sensors with the last one being an AC Delco. Now the check engine light with same p0327 code is showing intermittently.