I have a 2011 TSX Tech with automatic transaction. I have about 32K mi on the car. Everything is stock. Recently, when I pressed the gas pedal lightly to accelerate (around 40mph 2000rpm on local street or 60mph 2000rpm on highway), I could hear a high pitch whistling noise. It was not loud but was noticeable. The noise stopped when I eased off the gas pedal. The audio was off. So it was not from the speakers. I could not reproduce this all the time. But it seemed that I could reproduce it only when the AC was on. Do you think this is a transmission problem, AC problem, or something else?

Thanks for any help.

 

it could still be from the speakers if there is a bad ground somewhere

 

Thanks. But the noise is probably not speaker related since the noise from the engine compartment only happens when I step on the gas pedal lightly with AC on. The noise disappears when I let off the gas pedal.

 

does the pitch of the noise increase with the rev?

 

could be the compressor or the pulley

 

The noise does not change with the rev.

 

I just went to dealership for B1 service. They said they could not reproduce the noise during the test driver after the service. When I drove home afterward, I could hear the noise when I got on the freeway ramp. The service adviser claimed that the tech had checked the AC and transmission. When I looked at the paperwork at home, there was no mention of this.

Well, hope this intermittent noise is not something serious that I need to worry about (:

 

I have the same problem on my 2010 with manual transmission. I've taken it in three separate times and they have never been able to reproduce the noise. I even took the Service Manager with me so he could hear it. He seemed to think it was a valve on my AC compressor. They did some adjustment on it but the noise remained. I hope it's not a symptom of a larger issue especially with the unwillingness of the dealership to try and diagnose the problem.

 

honda did advise there's a noisy pulley and no fix as of yet , well in aus anyhow

 

funny i just came across this yesterday when i got on highway. I though it was some other car passing me while I was getting on highway.
I also have 2011 with 16k
Lets see if anyone else this too
I will take it to dealer in near future.