Why will my phone not connect to my car?

Bluetooth calling, CarPlay and Android Auto are three separate connections that fail in different ways. Which one has broken, and the reset order that fixes most of them.

Difficulty: beginner
Time: 20 min
Read: 5 min
Safety: caution

Short answer

Work out which connection has failed: Bluetooth handles calls and contacts, while CarPlay and Android Auto run the screen and usually need a cable or a separate wireless link. The fix that works most often is to remove the pairing from both ends — delete the car from the phone and delete the phone from the car — then pair again from scratch, rather than repeatedly retrying a stored pairing that has gone stale.

A modern car and a modern phone maintain more than one connection at once, and people describe all of them as "my phone connecting to the car". Bluetooth carries calls, contacts and often basic audio. CarPlay and Android Auto project the phone's interface onto the car's screen, either over a cable or over a combination of Bluetooth and a direct wifi link. Because these are separate, you can have working Bluetooth calls and no CarPlay, or vice versa, and the fixes are different. Identifying which one is broken is most of the work.

Safety

Do not attempt to pair, unpair or troubleshoot a phone while driving. Most cars will not allow pairing while moving for exactly this reason. Park properly before working through any of this.

Step by step

Establish what still works.Can you make a call through the car? Does the car show the phone as connected? Does the screen projection appear? Bluetooth calls working while the screen projection does not tells you the Bluetooth pairing is fine and the projection layer is the problem.
Restart both, properly.Restart the phone fully. Then switch the car off, open and close the driver's door so the system fully powers down, and start it again. A car's infotainment system often stays awake for some minutes after you switch off, so a genuine restart matters.
Remove the pairing from both ends.This is the step people skip and it is the one that works. Delete the car from the phone's Bluetooth list, and delete the phone from the car's paired devices list. Deleting from only one end leaves a half-pairing that keeps failing. Then pair again from the beginning.
Check the phone's permissions.The car needs permission for contacts and messages, and CarPlay or Android Auto needs its own permissions. A phone update can reset these, and the symptom is a car that connects but shows no contacts or refuses to project.
For CarPlay or Android Auto, try a different cable.Cables are the single most common cause of wired projection failing. Use a good quality data cable — many charging cables carry power only — and preferably the manufacturer's own. Try a different USB port in the car too, because some ports are charge-only.
Check whether the car limits how many devices it stores.Many cars store a small number of paired phones and silently refuse new ones once full. Deleting old devices from the car's list solves a pairing that will not complete for no visible reason.
Check for updates on both sides.Phone operating system updates regularly break older infotainment systems, and car manufacturers issue infotainment updates in response. Check the car maker's site or ask a dealer — many cars can be updated from a USB stick.
Test with another phone.If a second phone connects perfectly, the car is fine and the problem is on your phone. If no phone will connect, the car's system needs attention. This is the same halving test that works for every connection problem.

Common mistakes

Retrying the same stored pairing over and over — A pairing that has gone stale does not recover by being retried. Deleting it from both ends and starting again is what actually resolves it.
Assuming the car is at fault — Phones update far more often than cars, and phone-side permissions, cables and hotspot settings account for most failures. The second-phone test settles it in a minute.

If it doesn't work

Connects for calls but no music

Cause: The media audio profile is not enabled for that device — Fix: In the car's Bluetooth device settings, check that both phone and media audio are enabled for your phone. They are separate permissions and the car often defaults to one.

CarPlay or Android Auto worked until a phone update

Cause: Compatibility change — Fix: Check for a car infotainment update. In the meantime, deleting and re-adding the phone often restores it, and a different cable is worth trying because updates sometimes tighten cable requirements.

Wireless projection keeps dropping

Cause: The direct wifi link between phone and car being disrupted — Fix: Wireless CarPlay and Android Auto use a 5 GHz wifi link. A phone set to a wifi hotspot, or an aftermarket adapter, commonly conflicts. Turn off the hotspot and any VPN, then retry.

Contacts do not appear

Cause: Permission not granted, or contacts not downloaded — Fix: Check the phone granted contact access when it paired. Many cars have a separate download contacts option that has to be run once.

Car connects to someone else's phone instead

Cause: Priority order in the paired devices list — Fix: Most cars connect to whichever paired phone they find first. Delete devices you do not need, or set a priority if the car offers one.

Phone charges but nothing else happens

Cause: Charge-only cable or charge-only port — Fix: Try a known data cable and a different port. This accounts for a large share of CarPlay and Android Auto failures and costs nothing to rule out.

Questions people ask

Why did it stop working after a phone update?

Phone operating systems change Bluetooth and projection behaviour regularly, and car infotainment systems are updated far less often. Re-pairing from scratch resolves many of these; the rest usually need a car infotainment update.

Is a wireless CarPlay adapter worth it?

They work, and they add another link that can fail. If your car has wired projection that works reliably, an adapter trades reliability for convenience. If you make many short journeys, the convenience is real.

Can I use Bluetooth and a cable at once?

Usually yes, and it is sometimes the cause of odd behaviour — the car may route audio one way and calls another. If something behaves strangely, try one connection at a time to see which is doing what.