P0332 Knock Sensor 2 Low Input

**BillBoost37** · 07-21-2014

Regal tossed this code on Friday.

First rule of codes, clean and watch for them to come back. And it came back.

Looked up the code in GM ESI: Says to check wiring, find short and fix the wire basically. Thinking back to working on my car, I didn't route the rear knock sensor wire properly and ehhhh it's been 2+ years w/o any issues. Then I dug more and found out KS2 is the front sensor. Front and rear sensors are different codes and different wires. Being a single wire, this can't be a shared power etc issue. Plus reading up on how they use AC and monitor noise etc.. power/ground related doesn't seem to make sense.

Being lazy, I looked through the passenger wheel at the differential, and sure thing that knock wire was laying on the axle where it goes into the diff. I turned the wheel, reached in and moved the wire. Nothing too technical here because I didn't have any jacks/ramps to go underneath the car.

Code hasn't returned and I am watching for it. It is odd that wiring on the rear was tossing a code for the front. Either that or something bounced up off the road and hit the front, then by luck when I messed with the rear, the front fixed itself. I'm aiming more toward the rear grounding on the axle and pulling the power down. Somehow the pcm must have seen lower input at the KS2 sensor.

**Sven the Sexman** · 07-21-2014

As always Bill, it's the basic laws of the white car; if it can eff up, it will eff up, and it will be nearly impossible to figure out why because white car. The knock sensors on those are relatively sensitive to the point where any sort of external induction from even the ignition system can cause the code to pop up. The harness hitting the rear diff...well, that's bound to happen and is possibly just a fluke that it's fixed the problem. My guess would be more on the side of you have either a poor connnection or you have a knock sensor going out.

**Dtrick22** · 07-21-2014

Do I need to fix it for you

**BillBoost37** · 07-21-2014

LOL.. Jason, it's not hitting the diff. It was .. end of connector laying on a moving axle.

Erich.. c'mon over and fix it.

**Metal Links** · 07-22-2014

Having the same issue on a 04 GP, I replaced the wire, KS sensor and cleaned the connectors. I am still getting the code. Why couldn't mine be as simple as yours?...

**BillBoost37** · 07-23-2014

which wire did you replace? Take a look at the other wire. I'm thinking they are both derived from the same voltage and they can cross based on pcm reading.

My issue has not returned and literally..i moved the wire

**Metal Links** · 07-23-2014

I replaced the solid light blue wire leading to the rear knock sensor. I receive around the same 3.35 to both knock sensors(even after i changed the rear KS wire).