AAPL Stock: 117.81 ( -0.22 )

Printed from

iOS 4.1 causing car audio glitches?

updated 07:45 pm EDT, Mon September 13, 2010

USB output affected across makes, models

The recent iPhone and iPod update to iOS 4.1 has created quality problems with built-in car audio systems that owners describe as "scratchy, crackly" and bringing periodic micro-dropouts, according to reports on various sites including Apple's own discussion forums. The problem seems to affect several different makes of automobile and models of iPhone and iPod Touch that are connected to various receivers via USB.

Reports across sites vary but seem to indicate that Bluetooth streaming or audio coming out of the headphone port is unaffected; only iPhones or iPods connected by a dock and running iOS 4.1 seem to have the problem (which didn't happen under iOS 4.0.2).

The leading theory among users affected by the issue is that Bluetooth activity is somehow affecting the USB audio; some users report that turning Bluetooth off or switching to airplane mode alleviated the problem, though it's unclear if that eliminates the issue or just reduces interference-related noise.

Reports confirm that switching to Bluetooth or headphone-jack based output is a workaround that eliminates the problem.

Apple has thus far not commented on the issue, or indicated it was working on a fix. The company expects to issue iOS 4.2 sometime in November.

by MacNN Staff




  1. TheBum

    Joined: Dec 1969


    No problems here

    My iPhone running 4.1 still works as well as it did before the update in my ~ 5-year-old Alpine system.

  1. facebook_Thomas

    Via Facebook

    Joined: Sep 2010


    FM transmitter still works

    I have an FM transmitter that plugs into the dock connector and it works just fine. I stream Pandora through it for 30 min a day while coming home from work. I do have Bluetooth disabled so maybe that's why it works?

  1. facebook_Justin

    Via Facebook

    Joined: Sep 2010


    comment title

    I ordered an FM transmitter for my car but haven't gotten it yet, it's one of them Hong Kong items from eBay and it's a 30-pin only model. Wondering how it's gonna function, hopefully better then the Hong Kong video adapter I ordered, which often causes my iPhone 3GS to freeze.

  1. drewh01

    Joined: Dec 1969


    still having problems

    I believe the issue is when you are plugging the iPod directly into a device that has a USB port. At least this has been my issue with my Pioneer 1120 AV home receiver. I am not the only one experiencing this. The pops and static are subtle but noticeable, especially when listening on a decent system. I have reset & restored my ipod several times with the same results, however my other ipod touch running 4.0.2 is perfectly fine. This problem happened immediately after I updated.

Login Here

Not a member of the MacNN forums? Register now for free.


Network Headlines

Follow us on Facebook


Most Popular


Recent Reviews

Ultimate Ears Megaboom Bluetooth Speaker

Ultimate Ears (now owned by Logitech) has found great success in the marketplace with its "Boom" series of Bluetooth speakers, a mod ...

Kinivo URBN Premium Bluetooth Headphones

We love music, and we're willing to bet that you do, too. If you're like us, you probably spend a good portion of your time wearing ...

Jamstik+ MIDI Controller

For a long time the MIDI world has been dominated by keyboard-inspired controllers. Times are changing however, and we are slowly star ...


Most Commented