iPhone 15 Pro Max sound is really quiet when connected to my cars speakers through USB-C to AUX adapter...

Turn sound check off! In music settings!

I have the same issue with my 15 pro max. It’s driving me nuts, did you find a fix?

This is not a helpful response. I updated to 17.1 and have this problem now. I plug my phone in to my whole home system and the volume is very low now. Compared to yesterday where it worked just fine. I have to turn up my system to MAX volume now to be at a listenable level.

This worked for me and gave it a big boost:

go to settings, sounds and haptics, headphones safety, USB Audio Accessories, “Connected to Headphones” turn ON then back to OFF and it’ll give you a good 90% boost. Sometimes you have to turn it on and off 3 to 4 times in order to get that beautiful boost. Turning OFF Dolby helps a bit as well.

I did 4 things to fix this problem. I too purchased the iPhone 15 pro max and was very disappointed at the sound “dimming” through my aux/auto stereo system. Turning off the sound check helped a little, but not by much in my situation.

1) Made sure to turn the sound check OFF in iPhone settings.

2) Changed my newly purchased aux cord back to my old one. So I am using the “Griffin Survivor Aux Cable”.

3) Purchased the Apple “USB-C to Headphone Jack Adapter” to connect to my Griffin Aux Cable.

4) Changed the EQ setting to OFF on my iPhone. The first three steps were a huge improvement to increasing my music volume. I think my new aux cord wasn’t working too great. I also noticed that changing my EQ setting affected the volume as well.

I hope this helps.

This only works if you are using Apple Music. I use spotify, so these aren't even available to me. And I am sure that I am not alone.

BigKenD888 Said:

“iPhone 15 Pro Max sound is really quiet when connected to my cars speakers through USB-C to AUX adapter...“

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Troubleshooting CarPlay with Low Volume:

Seems to be catching on. Question is: "Just how many people have actually reported this to Apple?" Apple barely reads these forums as it is on their own time and will. So,…

Report this as a Bug to Apple...

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of this, if you don't report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this thread
4. Proceed from there as necessary

yes! It’s ridiculous the volume is so low and the only solution they are listing is about car play. This is obviously about when plugged into an aux cable. I wouldn’t use an aux cable if I had car play smh

BigKenD88 Said:

"iPhone 15 Pro Max sound is really quiet when connected to my cars speakers through USB-C to AUX adapter...: [...]Any recommendations on a USB-C to AUX cable or adapter that will work better? Oh, I have tried connecting through bluetooth as well as it is also quiet so that is a no go."

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For reference...

Troubleshooting CarPlay:

A. Driver's Manual:

Read your driver's manual to find out more about syncing this.

B. Try being in Park:

For many, they must have their automobile in park to get this to all pair.

C. Visit this Link:

If you need help with CarPlay - Apple Support

Same here and I’ve tried everything and it’s still terrible

I am currently trying to follow your directions. I am under headphone safety, I do NOT "connected to headphones" where it says on and off. under the usb accessories. it just says forgter usb settings.

Having the same issue with Iphone15. my iphone 11 would "scream" that I would have to turn the phone volume down and still have a load radio. I am using the same 3.5 mm aux cord with a usb adapater. I have tried 3 different onces from different stores. I had a cheap ebay adapter from aux to the lightning for the 11 and i would say it was at least 60 % louder

did that, volume is still the SAME

I am having the same issue. However I’m connecting thru Bluetooth in my car and AirPods. Volume is very low.

BigKenD88 Said:

"iPhone 15 Pro Max sound is really quiet when connected to my cars speakers through USB-C to AUX adapter...: [...]Any recommendations on a USB-C to AUX cable or adapter that will work better? Oh, I have tried connecting through bluetooth as well as it is also quiet so that is a no go."

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Getting the Right Adapter:

Find an adapter on Amazon or NewEgg. Be certain you verify its compatibility with your iPhone model and the installed iOS.

For reference…

Troubleshooting iPhone Audio:

A Few Links that May Help:

• If you Hear No Sound or Distorted Sound from your iPhone, iPad, or iPod touch Speaker - Apple Support

• If the Microphones on your iPhone aren't Working - Apple Support



• Control Audio Playback on AirPods with iPhone - Apple Support

• Adjust Audio and Visual Settings on iPhone - Apple Support

• Adjust the Volume on iPhone - Apple Support

• Volume Output: If you Can't Hear a Person on a Call or Voicemail or if the Sound isn't Clear on your iPhone - Apple Support

• Volume Input: if your Microphone isn’t Working or People Can’t Hear you While you’re on a Call -Apple Support