iPhone 12 4g/5g Data disconnection using CarPlay with wireless connection

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Level 1

11 points

iPhone 12 4g/5g Data disconnection using CarPlay with wireless connection

This only occurs using CarPlay. Data disconnection occurs after approximately 5 to 10 minutes in areas with a strong data signal. A Full factory reset of the Car unit, followed by a full factory reset of the iPhone, has not resolved this problem. A recent wireless CarPlay test connection using an old iPhone 7 worked fine with no data disconnection. This appears to indicate a problem with the iPhone 12. Wondering whether this could be an app-related problem?

iPhone 7, iOS 15

Posted on Aug 1, 2025 03:40 AM

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Answer 1

Alancito

Level 7

29,561 points

Aug 1, 2025 02:40 PM in response to manwa9

manwa9 ~ What version of iOS is your iPhone 12 running?...

Settings > General > About > iOS Version

As your iPhone 12 could be almost 5 years old, it's worth checking for a weak, aging battery which can cause connectivity issues. So...

Does your iPhone 12 still have its original battery?

And what's the Maximum Capacity % here?...

Settings > Battery > Battery Health & Charging

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Answer 2

manwa9 Author

Level 1

11 points

Aug 3, 2025 02:12 AM in response to Alancito

Battery Health indicates 100% , and the iPhone sits on a charging pad in the vehicle. S/w iOS 18.6. The older iPhone 7 used for testing purposes is running ancient iOS s/w 15.8.4 but does not drop its 3g/4g connection.

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Answer 3

Alancito

Level 7

29,561 points

Aug 3, 2025 04:05 AM in response to manwa9

manwa9 wrote: "Battery Health indicates 100%..."

For an iPhone 12, that implies the battery has been replaced. Was it done at an Apple Store or by other qualified technician using a genuine iPhone battery?...

Repair Provider Verification - Official Apple Support

...I ask because Apple says: "Using nongenuine batteries might also result in unexpected behavior after installation, device software updates, or while charging." Source:

About genuine iPhone batteries

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