Knock Sensor Advice

[spade77]

Hello, all. This is my first post on this forum, and I've made use of the search function, but I wanted to get some input if I could.

I recently purchased a 2006 Tahoe PPV with the Flex Fuel 5.3 V8. It's in amazing condition for its age, under 150,000 miles, and used to be a Richland County, SC Sheriff's Department unit (so it probably was on Live PD or On Patrol: Live at some point).

Anyway, it recently had the CEL come on. I hooked my code reader up, and got code showed P0332, which of course is Knock Sensor 2 low input (Bank 2). Normally, I'd just go ahead and replace the knock sensors. However, since this is a former police vehicle, I was able to get the maintenance history through a FOIA request with the Richland County Sheriff's Department. It had just had the knock sensors replaced about a year and a half ago.

And from what I've seen throughout looking at the rest of the vehicle and the maintenance history, they generally used the cheapest aftermarket parts available. That said, before I go through the rather laborious process of replacing the knock sensors and related wiring harness, should I be looking for anything else that could throw this code? Or do you all think swapping out the knock sensors and harness would solve this issue? Any help the community can share would be greatly appreciated!

 

[Marky Dissod]

... It had just had the knock sensors replaced about a year and a half ago.
From what I've seen throughout looking at the rest of the vehicle and the maintenance history, they generally used the cheapest aftermarket parts available.
That said, before I go through the rather laborious process of replacing the knock sensors and related wiring harness,
should I be looking for anything else that could throw this code?
Or do you all think swapping out the knock sensors and harness would solve this issue?

Maybe it's the sensor, or maybe not.
Maybe it's the wiring harness? What else could it be?
Sure, it's possible that swapping out the knock sensors and harness could solve this.
But if you're gonna take the manifold off to address those, why not look for other stuff?
And while the manifold is off, address the oil pressure sender, among other things ...

 

[Eldiablo]

Hello, all. This is my first post on this forum, and I've made use of the search function, but I wanted to get some input if I could.

I recently purchased a 2006 Tahoe PPV with the Flex Fuel 5.3 V8. It's in amazing condition for its age, under 150,000 miles, and used to be a Richland County, SC Sheriff's Department unit (so it probably was on Live PD or On Patrol: Live at some point).

Anyway, it recently had the CEL come on. I hooked my code reader up, and got code showed P0332, which of course is Knock Sensor 2 low input (Bank 2). Normally, I'd just go ahead and replace the knock sensors. However, since this is a former police vehicle, I was able to get the maintenance history through a FOIA request with the Richland County Sheriff's Department. It had just had the knock sensors replaced about a year and a half ago.

And from what I've seen throughout looking at the rest of the vehicle and the maintenance history, they generally used the cheapest aftermarket parts available. That said, before I go through the rather laborious process of replacing the knock sensors and related wiring harness, should I be looking for anything else that could throw this code? Or do you all think swapping out the knock sensors and harness would solve this issue? Any help the community can share would be greatly appreciated!

Put them on outside of engine one on front of passenger head , the other drivers head side half way. Solved forever!

 

[blondie70]

Put them on outside of engine one on front of passenger head , the other drivers head side half way. Solved forever!

How to attach them to these locations ElDiablo ?

 

[OR VietVet]

Get Genuine GM or AC Delco parts for the whole thing. I am a fan of Fel Pro gaskets. This is not a big job. If never done, look at a you tube video or 3.

Welcome to your first posts.

 

[MM60]

How to attach them to these locations ElDiablo ?

I have 03 tahoe 5.3. I bought ac delcos and mounted them where you did. After about 40 miles the codes came back again. Not sure why that occurred?

 

[OR VietVet]

Hopefully you did the harness, too.

What codes?

 

[Stonefort]

And from what I've seen throughout looking at the rest of the vehicle and the maintenance history, they generally used the cheapest aftermarket parts available.

Welcome! The knock sensors are super common to go out and quite an easy job to replace. It was the first thing I did once I bought my 04 Tahoe a few years back. I did the intake gaskets as well.

All you need to worry about is getting factory replacement or ACDelco for the sensors and the harness. Don't reuse the original harness. The reason yours already need to be replaced are (likely) because non factory parts were used. For whatever reason, the aftermarket has trouble with the knock sensors and harness.

I have 03 tahoe 5.3. I bought ac delcos and mounted them where you did. After about 40 miles the codes came back again. Not sure why that occurred?

I don't know what you guys are talking about with "mounted them" but it almost sounds like they are being mounted in a different location? If so, please do not do this. Put them in the factory spot and use ACDelco here.

 

[Stonefort]

Also - I replaced the orings on my injectors. They were a bit hard and flat spotted. They are cheap and easy to do during your knock sensor job. I recommend having some on hand anyways in case you tear one or something.

Jump right into it after you get the parts.....it's such an easy job that it was actually enjoyable for me.....I had been working on a ford earlier and that sure helps make things seem less insane and ridiculous.