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Interference on AM Radio on Weak Station from Electric Steering

imidazol97imidazol97 Member Posts: 27,179
edited May 2016 in Chevrolet
I hear a high pitched sound on a weak radio station that had been normal in reception until the last few months. It's there on some other more distant stations besides the 760 AM frequency that I listen to a lot.

It's an even tone at about 1500 Hz. It's gone if there's no tension on the steering, then it's there lightly with a slight tension turning the wheel, and it's a brushing sound with heavier torque on the steering wheel as the load on the steering motor increases.

Changing load on the alternator by turning on lots of high draw accessories does not change the sound.

Has anyone had this symptom?

2014 Malibu 2LT, 2015 Cruze 2LT,

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    steverstever Guest Posts: 52,454
    Not that it matters but it this on your Malibu or Cruz?
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    imidazol97imidazol97 Member Posts: 27,179
    stever said:

    Not that it matters but it this on your Malibu or Cruz?

    This is on the 2008 Cobalt.

    2014 Malibu 2LT, 2015 Cruze 2LT,

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    steverstever Guest Posts: 52,454
    edited May 2016
    lol, that was going to be my next guess.

    Dunno, seems like it was always the plug wiring that causes radio interference. Assuming your Cobalt even has plugs. :)
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    thecardoc3thecardoc3 Member Posts: 5,752
    Is the noise there key on engine off?
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    imidazol97imidazol97 Member Posts: 27,179
    edited May 2016

    Is the noise there key on engine off?

    No noise with engine off but key ON. Then when engine starts, the power assist to the steering
    is turned on and the noise will occur then in relation to the amount of twist on the steering wheel.

    When engine is running and steering wheel is turned invoking power assist but not rotating the
    tires because the car is not moving, the whine is there AFTER the key is turned off and steering
    held in tension requiring electric assist for a SECOND or so. But the whine dies as the power to
    the assist from a capacitor dies out and the assist falls off and the steering wheel is dead during that
    second after the key is turned to OFF.

    Going down the street whine only occurs when steering is applying some effort to correct path.
    Let go of steering wheel so car guides itself, and there's no whine.

    This is on some stations that are not as strong, such as Detroit 760 which is 150 or so miles away.

    I believe the steering motor was replaced long ago on the car. It now has 70K miles. Recent work
    was done couple months back under bumper-to-bumper warranty for a metal on metal noise in
    steering shaft as front wheels hit bumps. No looseness felt in steering, just a noise. I believe
    dealer replaced "intermediate shaft." I don't have a work order because it was under the warranty.

    2014 Malibu 2LT, 2015 Cruze 2LT,

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