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How To Diagnose GM Knock Sensors - P0327 & P0332
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- Опубликовано: 14 авг 2024
- Come along with Eric O. at the SMA shop as he has a look at the infamous GM knock sensors on this 2003 Chevy 1500 with the 4.8. This is a very common problem on many GM trucks and in this video we show you how to diagnose the codes DTC P0327: KNOCK SENSOR CIRCUIT - LOW VOLTAGE - SENSOR 1 & DTC P0332: KNOCK SENSOR CIRCUIT - LOW VOLTAGE - SENSOR 2 using a simple lab scope and some simple testing methods.
Description:
The Knock Sensor (KS) system enables the Powertrain Control Module (PCM) to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The system uses 2 KS located under the intake manifold. KS 1 is located at the front of the engine. KS 2 is located at the back of the engine. Each KS produces and AC voltage that varies depending on the vibration level during engine operation. The PCM adjusts the spark timing based on the amplitude and frequency of the KS signal. The PCM used each KS signal to calculated an average voltage range value. If the KS system is operating normally, the PCM should monitor the KS voltage varying above and below the voltage range. If the PCM detects the KS signal voltage within the voltage range, or the KS signal is not present, a DTC will set. DTC P0327 refers to the front KS. DTC P0332 refers to the rear KS.
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Disclaimer:
Due to factors beyond the control of South Main Auto Repair, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. South Main Auto Repair assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. South Main Auto Repair recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of South Main Auto Repair, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not South Main Auto Repair.
Thank you for that video. I've got a Knock Sensor fail on a GM Astra, and seeing you check the input has given me the energy to finally get my PC-Based scope installed on my laptop and prove the fault.
I'm starting out as a full time workshop since April, so my kit is not as advanced as yours (although electronics is my passion, and Im already a "very very very advanced" DIY'er), but I did get around to setting up my Hantek computer scope, and diagnosed an identical problem with a 2003 Opel Astra.
My background is in Aerospace system design for Rolls-Royce, but I have had to leave full time work due to illness so I've ended up setting up a small engineering shop in Madeira, Portugal (almost by accident|!)
My approach to diagnostics is similar to yours - "Prove the root cause then change the right part" - this approach is serving me well - I'm already inundated with work - I get all the weird problems - the stuff other garages hand off (weird diagnostics problems etc) , or won't take on ( complex oddities like Rolls-Royces and Land Rovers ). My favourite is cars that have had the "Parts Shotgun" and still aren't fixed!. It's really keeping me entertained!
Funny thing happened the other day - a guy arrived at the workshop with his new purchase - a very nice clean '02 Land Rover Discovery 2 V8.
These are very rare here - in fact, this is the only other V8 Land rover I know on the island! (Mine is the other one!)
He was very proud, and asked me to have a look at his new purchase (This is common, many garages (myself included) will give an "assessment" for free - usually the customer goes to the cheapest, and end up getting raped by a garage that doesn't fully understand the work)
Like you, I tell it like it is, and if they go elsewhere, then that's fine by me - I pride myself by being honest and fair, even if the customer isn't.
I immediately recognised that it was missing on at least 2 cylinders, and popped the bonnet to check it out.
Found 2 ignition leads adrift and not on the spark plug, and one completely failed! I plugged them back in and temporarily patched the third so it's running on 8 cylinders now.
I complimented him on finding such a clean example, and we had a chat about the car (I have an identical diesel variant of the same car also)
The customer went from "can you have a quick look at it and give me a quote" to " When can you take it in and sort it all out for me?".....
I'm taking the car in when he goes back to the mainland in 2 weeks!!! RESULT - I will have a decent amount of time to work on the car and wait for parts.
Keep up the good work - I enjoy your honest and realistic diagnostics and also picking up tips - I've just bought a "big nasty" of my own!!
And I'm looking into the various diagnostics options available here.
I'm sorted for a few manufacturers (VW Group, Land Rover, Mercedes) but as I do more diagnostics work, I could do with the easy access to circuit diagrams etc...
Loving the RUclips channel - If you fancy a trip to Madeira (Portugal), let me know - If you like classic cars - aim for the last weekend in May!
Obrigado!!!
Mike.
P.S. Extra credit for saying "Aluminium" and not "Aluminum"!!!
P.P.S = extra credit and my regards to Mrs "O"
You may not be an 'Piezoelectric' expert but you sure do have a great understanding of electrical circuits, troubleshooting the use of meters and general electrical theory / concepts. I have been in the electrical construction, service and maintenance industry for over 30 years and few of my coworkers could do what you do. The use of data between modules as I see in your videos is a common practice in fire alarm systems and building automation systems. You would do very well servicing either, Better than many electricians I work with. I guess the big diffrance is you seem like you want to know how it works, many I work with could not be bothered to learn new things. Thanks for the videos, I wish your shop was closer to me. I would love to bring you my 3 valve 5.4 Ford to look at.
3v Ford :/ Bahhh just throw some chains and cam phasers on it you will be fine ;)
South Main Auto Repair Now watch it there, Schroderbox gonna come knockin on yer door if yer not careful.
Haha he can knock all he wants, I could spin circles around Matt haha
Now, now Eric.... Dont forget when you came to me asking for help getting your channel off the ground. before I pushed your channel on my channel you couldnt break 2000 subs.
"if you come up dont forget about your dawgs, that's law"
Schrodingers Box We love you too Matt
I'm sorry you're not feeling well. I hope you get better soon. Thank you for showing the test with a digital voltmeter since I don't have a scope. US diyer's appreciate that very much. Another great video!
You can get a scope pretty cheap now days Kenneth if you want one...
South Main Auto Repair Which one do you highly recommend? I trust your judgment greatly.
Do a little googling on Hantek scopes and read the reviews. See what others are saying about them.
Thought the pico was the least expensive at $2,500?
Sandbag1300 well I can't afford nor would I be willing to spend $2,500 for a scope as a diyer.
Eric has the best channel for vehicle diagnostics on RUclips.
You did good getting this information out despite being sick. You even spent time using the DVOM for the DIY'er guys. That's cool.
But you have a Vantage so it would be no issue for you...
Eric , a friend of mine is looking at the following cars USED.
And i wondered do you see any major issues with these models that you
would sway someone away from? Just wondered how the Hyundai Suv & Kia's are.
2014-2015 Hyundai Tucson - 2.0L - 4cyl - Auto (naturally aspirated)
2014-2015 Hyundai Sante Fe - 2.4L - 4cyl - Auto (naturally aspirated)
2014-2015 Kia Soul - 4 cylinder (not sure on engine yet)
This is the exact same way i was taught to test these guys, manifold smack and all. Awesome video as always. Earlier this year I had my first one rusted so bad the top was completely gone and was damn near hollow. Took over an hour to get the little bastard out. Thanks for the video Eric.
careful how you smack intake manifold these days, most are made out of plastic.
Bob Moy you'll get there one day buddy lol
Yeah it is nice how GM made that nice little water well for them to sit in for us
Can always count on GM to make components fail 30x FASTER than they would naturally. :)
I can't thank you enough for the invaluable information you provide on your channel.
Eric cold cure. 4 sprays up each nostil with Brake cleaner 4 times a day, works a treat.
"chivy" that is what my dad called them. even when you dont feel good you still make a great video. summer colds stink...and of course on a weekend you are going away camping.
Everybody knows these GM knock sensors & harnesses fail all the time. It was nice to see the failed one on the scope, though. I think it was well worth a video. Like!
For our reference Eric, Piezoelectric devices are used to measure pressures by the generation of voltage. Piezoelectric sensors are constructed from alumina ceramics, metallized quartz, single crystals, or ultrasonic transducer materials that make up a bi-directional transducer capable of converting stress into an electric potential. Th e piezoelectric materials consist of polarized ions within the crystal. As pressure is applied on the piezoelectric material some mechanical deformation occurs in the polarized crystal, which produces a proportional output charge due to the displacement in the ions. Uses of this type of sensor in the automotive industry include piezoelectric accelerometers, piezoelectric force sensors, and piezoelectric pressure sensors.
🤯🤯
Thank you for taking the time to make this video, feel better and enjoy the trip...
Very good information Eric. Good to see someone test these as most just replace. Keep up the great work
Nice job Eric !! I now have a 2005 Silverado 1500 that's about to have the sensors and harness replaced. Due to a PO327 returning fault code. Your video helps to know how to test them while in place before and after. Great and thanks ...
Eric will not be making any new videos for about a month . He s been sent to a brake clean rehabilitation center to help with his addiction. Apparently snorting brake clean IS actually bad for you
So much for keeping it a secret...
BWAHAHAHAHA!!
Now you tell me! :D
South Main Auto Repair We already knew you were a brakecleanaholic but admitting it is 90% of the process.
he tried some other brake cleaner and his body does not agree with that
bobl78 Nothing but the best.
I feel your pain Dr O, just had a damn cold myself. Have fun camping!
Eric you're the man. Not 100% related to this video, but I just helped a neighbor diagnose a bad wheel sensor on his caddy CTS. we hooked up my crappy old matco scope and spun the hub. one side made a nice waveform but very low, other side amplitude was 3 times as high.
I think you showed this or something similar in an ABS video a while back, comparing signals side-to-side.. just wanted to say thanks for getting me on the right track.
Vitamin C, gobs of it, and jalapeno peppers for the stuffy nose. I always learn something when I watch your videos. Today I learned how to use the scope to watch the knock sensors signal. What I'm wondering is how the two wires made a duel trace? Was there a 3rd wire I didn't see? I'll watch it again, maybe I missed something.
that's not the only end them jalapenos will clear :))
Good video on how to diagnose bad knock sensors. If your going to replace gm knock sensors the first rule of the job is use delco knock sensors. I have a friend who i tried to tell him to use delco knock sensors. He went to autozone. He has replaced them 4 times now.
Excellent explanation of what you do! Thank you very much for helping us through your videos. A big greeting from venezuela
i guess I am kind of randomly asking but does anybody know of a good place to stream newly released series online?
@Maison Terrence flixportal :)
@Phoenix Fox Thanks, I signed up and it seems like they got a lot of movies there :) I really appreciate it!
@Maison Terrence happy to help :D
Thanks for the knock sensor lesson Eric.
Man I wish you would do the whole repair video on the knock sensor. 😟 hope you feel better Elric.
Nice video Eric. It's always entertaining when you can diagnose with a lab scope and a big hammer :D
You know the ol' saying ... If you can't fix it with a hammer, you've got an electrical problem! :D
Thanks for the great video.... especially the use of a multi meter....still working on getting a modis...verus out of my range...i work on family and friends as time allows...you know, for free labor
Awesome video Eric like always. Hope you feel better and enjoy your camping trip this weekend. Tell the family I said hiiiiiii!!!! Hope you have a great day
Fine video, been looking at recurring knock sensor after cleaning motor. Now know how to check.
Gaskets and sensors, harness on order after i get a pry bar and check with multimeter. Didnt know they are 1 wire sensors so will checl grounds too!
Thanks for taking the time to show us all your expertise again Rudolph. I can not until your next one, keep them coming.
Hey Snots, get well soon! You sir are a true professional. Thanks for all the videos.
Eric, I hope you feel better!
BEST video on KNOCK SENSORS! Thanks!
Best walk through and explanation on the net, thank you!
Great video. Will keep the knock sensors in mind. So in the future I may need to replace. My 2001 GMC has 175000 miles on her . So when she gets a few miles on it .I wont be surprised when the go bad.
WOW! You got that intake together FAST! :) Great video!
A fine demo there sir. Thumbs up 👍
Well, that was simple. "Easy peasy". Hope you feel better soon.
Love the snap on electronics and AWSOME videos,hopefully you will feel better 👍👍😎😎
Thanks for another awesome video! Get well soon Eric O and I hope you're camping trip went well!
Eric is armed to the teeth
Pico = minigun
Verus = shotgun
Vantage = handgun
Nobody can mess with Eric.
Been chasing this problem on my Firebird, always circuit one low volts. Thought I had replaced both sensors and the harness, code came back almost immediately, its been on and off since then. This is great information, I'll start looking at this more, maybe I bought a bad sensor.
Dedication! Has a lot full of cars and is three weeks out, sick as a dog and still gets a video out for his viewers!
Colds suck man. Get better soon!
Bless you, Hannah- for putting up with Mr. Grumpy. Us men are complete babies when sick. Eric- go make your eggs & bacon bag, get some fresh air.
Just had this occur on my 2004 GMC Sierra pickup. Had to order the parts where ever I was getting them from, so I decided to check around various places to source the parts. Funny how the price changes depending on where you get it from. The Chevy dealership wanted $99 each. The local AutoZone parts store could get them in a day for $72 each. Then I just happened to take a chance and ran the part number through the WalMart website and lo and behold.....$35 each, shipped to the local store for free in two days. All prices were for AC Delco OEM parts. WalMart even showed the wiring harness from the sensors to the connector on the top of the engine was available for $42. Gotta love competition.
Great video, hope you feel better
Does that mean we're getting an outdoors with eric O. Video?
Not this time :( I still feel like poo
South Main Auto Repair its all good... get well soon
Feel better! Thanks for yet another informative and entertaining vid.
The hair on your screen a
Nice video, im learning new things THANKS ERIC.
Enjoy the camping! Great video.
Eric I feel for you, I've been dragging that shit around with me for 2 Weeks now. Summertime colds sure suck.
Good tip on using ac voltage on dmm to test them, I never tried that but good solution if not got a scope or don't want drag it out and got dmm on hand . 👍
Modern resonant tuned knock sensors not so easy test by tapping like wideband knock sensors and need you simulate knock via fuel starvation to test sensors accurately .
Great Video! Hope the cold died quickly! Thanks to Miss Hannah for her help. How's she doing? Coming back to S.M.A. anytime in the near future? No cold in the last five years? Must have been all the brakkleen snorting!
Thanks for your time and taking the video, you are very professional
Good time to replace the oil pressure switch. So hot in the south, 8:30am Friday it looked like I jumped into a swimming pool. Ticket girl spreading germs!
great video on how to test them. but to be honest the part of Canada I'm in these sensors get so bad, especially the rear one the its just been a common practice that if its setting codes for them, the intake comes off, because 99% of the time that rear one is so rotten with rust and corrosion its disintegrated to nothing, and most of the time it won't even come out. and out of all that I have done at least every 8 out of 10 the valley cover has to be replaced also along with the seals. the rear hole is usually so rotten the cover can't be salvaged. The local auto wrecker was getting to know me pretty well for a while, in the course of a month I think I was there 6 times, and got all the good valley covers they had. I actually got lucky on one trip. the sensors and harness had just been done to that engine as well as the silicone dams, so everything was brand new and came apart nice, so I got and extra harness and 2 sensors from that one.
Thank you SOOO much. Very thoroughly and simply explained. Admittedly, I’m not very good with my scope. But I’m getting it powered up and Gonna play around with her. I’m getting low voltage codes on both. I suspect I have a problem between the main harness and pcm
Come on Eric it was the whiskey last nite lol. camping like in a tent? or a condo on a lake. bustin your marbles. you an family have a great time brother!
In between haha we sleep in a Cabin
you was spying on the wrong person last night, tis me that had a wee vodka hangover, almost feel better at 8:30pm next night
Thanks for another great video, I'm really learning a lot.
I just want to say thank you for that information
Awesome vid eric! I think of knock sensors as microphones. They pick up vibrations and amplify them to the pcm which can tell when its knocking
most are piezoelectric elements, and one use of them is mics :) so that works
Nice to know you can actually get a reading on the low AC volt scale of a DMM. I would have called it just based on the difference of the voltages between the 2 sensors.
Eric O I got the sniffles too. Like someone said, get out old nasty and wail on that bad sensor!
Was hoping you were going to Chicago with Ivan and Keith! Hope you have fun camping summer colds suck!
Nephew just did this job. Thanks for sharing!
Awesome video Eric. I learned a lot. Cheers!
Very informative, great information, Thank you and I hope you're feeling better 5 years later =)
Good show. Mine shows up as bank 2 which I suspect is the rear but I'll change both.
I did mine 3 years back and the dorman wiring harness seems to have worked ok. I did as the service bulletin said , was to put a bead of silicone in front of the sensor to deflect any water from pooling around the rubber plug. Not sure if that even does anything but hey . LOL
Great video, hope you feel better soon.
Get better soon Eric!
Here is a good tip n trick I would like to share. 1) Grab the closest shop rag (dirty or clean) and rip it down the center evenly 2) Roll each piece into an ice cream cone shape 3) With a slight twisting motion place one cone bottom end into each nostril 4)Repeat as necessary.
Soaked with brake clean?
+South Main Yes, brake clean is a prerequisite. MAP numbers quick discussion. I know you hate getting snot all over the phone, feel better man ;)
South Main Auto Repair Since we're talking about healthy chems acetone will dry that shit RIGHT out. MEK or carbon tet will work in a pinch too.
11:06 it all adds up 😳 5years ago the DEP messed with chemicals in brake cleaner! Bet there up to the same old shenanigans . Get some old stock and feel better my friend 😜lol if that was a Ford the exhaust manifold bolts would have been bouncing off the floor 😆hope you feel better
Just got finished changing out both of mine. Used the TSB. #2 was a corroded mess submerged in water.
Chevrolet 2004 Silverado 2500 6.0. Used GM OEM parts only. Sensor and harness and new manifold gaskets.
Could GM have put these in a more difficult place to get at and then build it to funnel water in a 2" deep hole to hold the water and then make it to where you have to take the top end off? I don't think so.
have to keep the service department busy somehow :)
Saturday morning coffee and eric o video. good start to the weekend. wot tools do you take camping with you Eric ?
rubber plugs lmao of course to make sure she doesnt sink at the dock.... so being sleep deprived lately with more projects then i need the knock sensor senses knocks in the motor like bad gas or timing issues because most people cant hear because of the noise pollution or is it more involved than that?
Hello Erick feel better great job
Great timing! I've got an intake leak on my 99 Sierra with the ever fuel efficient 6.0 and an going to do the knock sensors while I'm in there. I've heard to only use AC Delco sensors, just wondering what intake gasket you recommend? GM, Felpro...?
I use the steel backed Felpro's. They are about 30 bucks cheaper than OEM too
nice job as always Eric o.
Get well my brother.
Awesome explanation
Like how Snap-On put the stylus on a cord so it doesn't get lost. Wonder if they warranty lost stylii
Replaced the engine on a 2005 Tahoe. The incoming engine had its own knock sensors. After install I had code for low voltage knock sensor 1. Replaced both sensors and harness. It now says low voltage knock sensor 2…….
Did resistance and continuity checks on both sensors and harness. All ok. Decided to replace sensor two with different brand just in case but same result. Low voltage sensor 2. Swapped sensor 1 with sensor two. Problem remains. Low voltage sensor 2. Any suggestions???
Thanks for the incite ..I have a 06 Chevy...I do appreciate your way of explaining..and if you were making this video in 2020 your cold would probably be labeled as covid 19..lol...thanks again...
You have a summertime cold because the evil soldering fumes are catching up with you! Just kidding, great video. I always hit the like button before I watch the video because I know it will be entertaining.
Get well soon Eric.
That's one thing about being your own boss ..... no sick days. If you take one, you don't get paid.
Yep that is the beauty of it...
Eric PLEASE HELP ME WITH SOME INFO . I now have a flashing check engine light code p0322 senor 2 circuit low . Going to change both and wire harness . Question is do I have to replace any other gaskets intake , etc .
Got a 2001 silverado 5.3. Had 3 sets of knock sencors and harness put in still get alternating codes between 1 and 2 can't figure this out. Resistance is 143 on both sencors. Please help
I allways set my AC same as the outside temp(or 2 degrees celsius under) after i made the mistake setting the temp max low to cool my self down. I had very bad cold for two weeks after that.
Great video my friend I just used that test on my yukon I'm having a good response from both sensors but I still have a code only when driving on freeway I can drive streets all day and nothing but when I'm on freeway the check light come on with the p0327 code only what could that be
Hope you get better soon
Thanks for the video. Any reason to replace the lifter valley cover gasket? Is that a common oil leak problem?
dude i really like your viedios you explain stuff very well thanks
Thank you this helped.
It's 3:40 am California time. Gotta get in my SMA fix. The good stuff Eric...mild bill is a fake subscriber. Cheers
Hope you can help. 2003 Suburban. Rear knock sensor failed from coolant connector near firewall failing. Rear sensor hole filled with coolant. Replaced both sensors with new Delco sensors. Still getting knock sensor codes. I’ll clear them and it comes back all the time. I have a couple of ODBll scanners. Can you point me in a direction for troubleshooting? Really enjoyed your videos. I’m just a hobby car guy. Thanks for your help!!!
Did u ever figure out your knock sensor issue?? I'm just wondering because I have the code come up back in September 2022 and I replaced w/ ac Delco sensors and harness, did the silicone wall, all new valley cover gaskets, etc.... And today as I was hitting the gas on the highway to pass another vehicle I got a low voltage code for bank 1 knock sensor. Code PO327
Hope you're feelin' better by now Eric. I've got pretty bad allergies, so my nose is pretty much packed solid constantly ... but then when I get a cold it feels like I'm suffocating. Sucks! Know the feeling. No calling in sick when you're the owner!
I'm going to have to check out my Silverado, and see if my AC setting on my meter will read differently on those - I saw the Verus has an RMS AC setting - my meter doesn't. Just regular AC. Probably means mine would read higher? What I would expect, anyway.
Yeah gotta love GM. Screw us on the purchase, screw us on warranty, screw the techs that make them money (making them work for FREE- that's called slavery!!!), and then screw us on parts! To pay us back for our loyalty, they build their parts EVERYWHERE but in America, AND build their vehicles in the cheapest, lowest-quality way possible! WTF! Wish some company would just rip off all their service data and post it on the net free - programming and everything. They deserve that, IMO.
PS> My grandpa always kept a little blackberry brandy under the sink for when he caught a cold. My choice is a little Jim Beam - does the job a little quicker. Better than Sudafed. :D
I have been trying the Jim Beam and coke but with the meds they gave me I am not sure it is a good combo... or maybe it is hahah
Moderation is key! :D
Smitty Smithsonite You're talking about the meds, not the JB, right?
I like a little of both. :D
In all seriousness, mixing pills (especially narcotics) with booze kills your liver 100x faster than just booze alone. I've lived long enough to see it happen to people I know. It never ends well. Not a good habit to form, for sure. I've seen a couple people barely make 30 years old before their livers checked out, from doing that for years.
Great Video. Thank you
Get well soon.
Thanks for the video.
my knock sensor is on bottom of my block.,should antifreeze came out??? there is a blockage of black crap inside the hole where the knock sensor goes.,,,any help would be great !!!!!
Is there a plug i can probe with a multimeter in ohms mode to test the tap? Don't want to yank the plenum to test. Thanks.
Your tap test sounds just like an old ford I had when idling.....til I sold it lol.
My Actron said that the unbalance wheel will turn on that knock sensor code. Eric you should check your wheel balance. They may need to be rebalance HAHAHAHAHAHAHAHA Great video Bro!
Haha he is still wondering what a knock sensor is I imagine...
South Main Auto Repair And here we call the DSO2 the "Narc" sensor cause all it does is tell on the bad cat lol.
Hello Eric
I have a 2008 Ford Focus Sedan (2.0L Duractec , 4spd auto)
It has just manual air/heater controls. And speed 1,2 4 work fine.
But number 3 basically is the same speed as #2. i doesn't get faster on # 3. But it will get faster on 4.
I replaced the Blower Motor Resistor with a OEM FORD Part and it made no difference.
Any ideas what the solution to that is?
lightningsmokerXx maybe your switch is bad. Usually if a resistor goes bad no setting works except for the highest speed
Very helpful video, thanks!