18k CPS from right rear

[BigBlue]

I have a 06 Commander and lately I started hearing a high pitched whine from what sounds like the right rear (up high) on accelaration only. I have no idea what is up there, and the whine sounds like it is from the radio ( sounds electronic) but I still hear it when the radio is turned off. After driving for about 40 minutes it disappears.

Has anybody else encountered this? I went weeks thinking it was Tinitus and my old ears, but my young son confirmed the existence.

On a side note, is the Commander still in production?

KKKKFL

[robertssteve3]

1. I have a 2006 Limited and hear the same thing at speeds > 60mph.

I would be eager to hear some other people's answers.

2. No. 2010 was the final production year. So they are a "collectors item"... Kinda. lol

[BigBlue]

The pitch is so high that it is difficult to ascertain the exact location.. but my best guess is that it is coming from behind an interior panel just ahead of the right rear wheel. It is only under acceleration and disappears when I lift off the gas pedal.

Surely someone know what electronics are located in this area? How about a fuel pump?

KKKKFL

[Eric S]

No longer in production 2006–2010.
As for the high pitched noise. Not sure what it could be exactly. Up high on the right rear I think there is only HVAC controller for the 3rd row seating. Hmmmm wonder if it has something to do with the coolant that it circulated back there. Other than that maybe the fuel pump? Might want to have someone else drive while you try to pinpoint the location.

[Kansas1230]

What happens if you rev it in neutral (or in gear with the brakes on)? Reverse? Change with speed (what speeds)? Can it be heard outside the vehicle?

[BigBlue]

I tried reving it in neutral, and there was no sound. I only hear it under load conditions. As I cruise down the interstate, any lift off the pedal and the sound disappears. It also goes away after 20 minutes of interstate driving. It may have something to do with the outside temprature. Since I only hear it under a load condition, I couldn't tell you if the sound can be heard outside the vehicle. The pitch doesn't really change with a variation in speed, but the same pitch is a little louder if the load is increased (ie. going up a greater incline).

Thanks
KKKKFL

[Eric S]

Well you can scratch my suggestions then.
Any chance the sound can be coming from the rear axle? Sounds like that are often a bearing going bad.

[Creek]

Do you know if the windshield has been replaced recently? Mine made a a high pitch sound and they ended up replacing thw glass. This happen from new and was a common problem. Not sure how long you have had yours. My XK is an 06 Limited. 4.7

[indymtb]

Almost sounds like the transmission based on the fact that it stops when not under load try using the manual shift (if you have it) and see if happens in multiple gears.

[BigBlue]

Due to the location, (Right rear, either behind the panel or under the right rear seat) its doubtful that this is transmission related. I have had windshield issues in the past when the front windscreen was replaced, so I know what that sounds like. This is more of an "Electronic Squeal" Very high pitched. It does go away after 20 ot 30 minutes of driving. It is very similar to the ringing (Tinitus) folks have in their ears. I may have to put someone in the rear with a Stethascope to try and locate it.

KKKKFL