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Discussion Starter #1
I have a 2017 Volt Premier.

This may be an unusual problem, but sometimes, most likely when I've first started driving, I'll make a cell phone call through the radio, and the person's phone is ringing at half the speed and pitch as normal, and when they answer, the speed of their voice is also too slow to understand. Anybody ever heard of this?

Hanging up and calling them back usually works as a fix, but this is annoying, as it has happened several times.

Suggestions, please!
 

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I've been having EXACTLY the same issue with my 2016 ELR. Glad you posted; I thought it was just me!

It's completely reproducible for me: the first call I make in a drive cycle always has this issue. It sounds like you're trying to disguise your voice or something—the person on the other end hears you in a weird/low tone and you hear them the same way. If I hang up and call again, everything works perfectly. It's so predictable for me that I've started calling my home number before I make a call to someone else, just so the connection is normal. Plugging the phone into the car so it's a wired connection (instead of Bluetooth) seems to solve it most of the time, but I've experienced the issue when plugged in, too.

I really think this may be iPhone related and likely introduced with one of the iOS 10 updates, as I didn't notice the issue when I first got my car and I haven't gotten a new phone. (I'm running iOS 10.3.2 on a GSM iPhone 7.)

What phone are you using? Have you tried plugging it in before making a call? Hopefully this is something that will go away with the next iOS update.
 

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I have a 2017 Volt Premier.

This may be an unusual problem, but sometimes, most likely when I've first started driving, I'll make a cell phone call through the radio, and the person's phone is ringing at half the speed and pitch as normal, and when they answer, the speed of their voice is also too slow to understand. Anybody ever heard of this?

Hanging up and calling them back usually works as a fix, but this is annoying, as it has happened several times.

Suggestions, please!
I have the same issue. I have an iPhone6S and think the issue is caused when I had WiFi calling enabled on the phone, so I disable WiFi calling when driving. It seems to fix the problem.
 

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I've had this happen when playing music off an iPod via USB. It's always the first track when it starts playing. It can be fine for a second or so, then it starts with the half speed playing (maybe when my phone connects, so perhaps that's the link?). Going to the next track solves it.

Keith
 

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Discussion Starter #5
I've been having EXACTLY the same issue with my 2016 ELR. Glad you posted; I thought it was just me!

It's completely reproducible for me: the first call I make in a drive cycle always has this issue. It sounds like you're trying to disguise your voice or something—the person on the other end hears you in a weird/low tone and you hear them the same way. If I hang up and call again, everything works perfectly. It's so predictable for me that I've started calling my home number before I make a call to someone else, just so the connection is normal. Plugging the phone into the car so it's a wired connection (instead of Bluetooth) seems to solve it most of the time, but I've experienced the issue when plugged in, too.

I really think this may be iPhone related and likely introduced with one of the iOS 10 updates, as I didn't notice the issue when I first got my car and I haven't gotten a new phone. (I'm running iOS 10.3.2 on a GSM iPhone 7.)

What phone are you using? Have you tried plugging it in before making a call? Hopefully this is something that will go away with the next iOS update.
I'm using an iPhone 6S. The wifi calling idea is interesting, I'll try disabling it and see what happens.
 

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I've only tried one call so far, but it worked normally after disabling Wi-Fi Calling. I'd already disabled my car's OnStar Wi-Fi connection and was definitely not connected to it or any other Wi-Fi hotspots, so I didn't think the Wi-Fi Calling feature could be the problem.

I'll keep testing it, but I'm curious to know if anyone else's Bluetooth issues are solved by turning off Wi-Fi calling (and if you were connected to the car's Wi-Fi hotspot). If that is the root of the problem, I'll be very disappointed. I don't have a reliable cell signal in my house, so I depend on Wi-Fi Calling and don't want to have to remember to turn it off every time I get in the car!
 

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I've only tried one call so far, but it worked normally after disabling Wi-Fi Calling. I'd already disabled my car's OnStar Wi-Fi connection and was definitely not connected to it or any other Wi-Fi hotspots, so I didn't think the Wi-Fi Calling feature could be the problem.

I'll keep testing it, but I'm curious to know if anyone else's Bluetooth issues are solved by turning off Wi-Fi calling (and if you were connected to the car's Wi-Fi hotspot). If that is the root of the problem, I'll be very disappointed. I don't have a reliable cell signal in my house, so I depend on Wi-Fi Calling and don't want to have to remember to turn it off every time I get in the car!
So just turn off wifi when you leave home. It just wastes battery anyway.
 

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Even if I remembered to do that every time I got in the car (what a pain since I actively use Wi-Fi everywhere but in the car), it isn't what seems to be causing the issue with calls over Bluetooth. Like I said, my car's Wi-Fi is disabled and my phone is definitely not connected to it.

Wi-Fi Calling (it's a setting separate from Wi-Fi, located in the "Phone" section of Settings) does seem to be the culprit, unfortunately.
 
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