When your car won’t start, the problem isn’t always a major mechanical failure. Modern vehicles rely on key fobs, electronic steering locks, push-button start systems, computers, sensors, and other electronics to start the engine normally.
A weak car battery, a dead key fob battery, a locked steering wheel, or an incorrectly positioned shifter can sometimes prevent the vehicle from starting. These problems can also affect CarPlay, Bluetooth, USB ports, and the infotainment system.
The best way to narrow down the cause is to pay attention to what happens when you try to start the car.
Quick Things to Check When Your Car Won’t Start
Before changing settings on your phone or resetting your infotainment system, check the vehicle itself.
- Make sure the transmission is completely in Park.
- Press the brake pedal firmly.
- Check whether the dashboard lights turn on.
- Listen for clicking or cranking sounds.
- Look for a Key Not Detected or similar warning.
- Check whether the steering wheel is locked.
- Try your spare key or key fob if you have one.
- Check whether the headlights and interior lights work.
What you see and hear during these checks can help you determine whether you have a technology problem, an electrical problem, or a need for professional automotive service.
Check the Steering Wheel Lock
A locked steering wheel can make a starting problem seem much more serious than it is.
Many vehicles have a steering lock that prevents the wheel from turning while the vehicle is off. It can sometimes engage when you turn the steering wheel after shutting off the vehicle.
When this happens, the steering wheel may feel stuck, and you may have trouble turning the ignition key or completing the normal starting process.
Don’t force the steering wheel or ignition key.
Try applying gentle pressure to the steering wheel in the direction of slight movement while performing your vehicle’s normal starting procedure.
If you haven’t encountered this problem before, this guide explains how to unlock a locked steering wheel and covers common situations that can cause a steering lock to engage.
If the wheel won’t release using the normal procedure for your vehicle, check the owner’s manual. A steering-lock warning that doesn’t go away could indicate a problem that needs professional attention.
Make Sure the Car Is Actually in Park
Automatic vehicles generally need to detect that the transmission is in Park or Neutral before allowing the engine to start.
Sometimes the shifter looks like it’s in Park even though the vehicle hasn’t correctly detected its position.
Press the brake pedal, move the shifter out of Park, and then move it firmly back into Park.
Try starting the vehicle again.
Depending on the vehicle, you may also be able to start it in Neutral. Check your owner’s manual before trying this.
If the car consistently starts in Neutral but not in Park, consider having the vehicle inspected.
Check for a Key-Fob Problem
Push-button-start vehicles must detect an authorized key before they start.
A weak or dead key-fob battery may cause a warning such as:
- Key Not Detected
- No Key Detected
- Key Not Found
- Key Battery Low
Make sure the key is actually inside the vehicle, and then try your spare key fob if you have one.
Many vehicles also have an emergency procedure for starting the car when the key fob battery is weak. For example, some cars let you hold the key fob against the Start button or place it in a designated location.
The procedure varies by manufacturer and model, so check the owner’s manual for the correct method.
If the backup method works, replacing the key fob battery may solve the problem.
Look at What the Dashboard Is Doing
Your dashboard can provide some of the best clues about why the vehicle won’t start.
Nothing Lights Up
If the dashboard stays completely dark, check the headlights and interior lights.
If those don’t work either, the vehicle may have a dead battery or another electrical problem.
At this point, troubleshooting your iPhone or CarPlay probably won’t help.
The Dashboard Lights Are Dim or Flickering
Dim or flickering lights can be another sign of a weak 12-volt battery.
You may also hear rapid clicking when you try to start the car.
The Dashboard Looks Normal
If the dashboard and accessories appear to work normally but the car doesn’t start, look carefully for warning messages.
Pay particular attention to warnings involving the:
- Key
- Brake pedal
- Transmission
- Steering lock
- Immobilizer
- Security system
These messages can help identify which system is preventing the vehicle from starting.
Listen to What Happens When You Try to Start the Car
The sound the vehicle makes can also help narrow down the problem.
Nothing Happens
If there’s no sound at all, check the key fob, brake pedal, transmission position, steering lock, and vehicle battery.
You Hear Rapid Clicking
Repeated clicking often points to a battery or electrical power problem.
You Hear One Click
A single click can have several causes involving the battery connections or starting system.
The Engine Cranks but Doesn’t Start
If the engine turns over normally but doesn’t start, you’re probably dealing with something beyond a simple phone, CarPlay, key fob, or steering lock problem.
Fuel, ignition, engine-management, sensor, or other vehicle problems can cause this symptom.
That’s a good point to consider having a professional automotive diagnostician assess your phone or infotainment system rather than continuing to troubleshoot it yourself.
Don’t Assume a Black Infotainment Screen Is the Problem
Imagine that you get into your car and notice several things at once.
The infotainment screen is black. Your iPhone doesn’t connect to CarPlay. Bluetooth isn’t connecting. Then the vehicle won’t start.
It might look like several unrelated technology failures, but they could have the same cause.
Your infotainment system, USB ports, Bluetooth hardware, and other electronics depend on the vehicle’s electrical system. A weak or dead 12-volt battery can therefore affect several systems at once.
If the car won’t start and multiple electronic systems stopped working at the same time, troubleshoot the vehicle’s power problem before resetting your iPhone or deleting its connections.
Check Whether the USB Ports Have Power
Connecting your phone can provide another useful clue.
Plug a known-working phone and cable into the vehicle’s USB port.
If the phone doesn’t start charging, remember that some USB ports only receive power when the ignition is in the Accessory or On position.
A weak vehicle battery can also prevent accessories from operating normally.
If the car starts but your iPhone still doesn’t charge, you can troubleshoot the phone, cable, charger, and USB port separately.
SupportYourTech has a separate guide about charging an iPhone 15 in a car if the vehicle is operating normally but your phone isn’t receiving power.
Wait to Troubleshoot CarPlay Until the Car Is Running Normally
CarPlay relies on your vehicle’s infotainment and electrical systems.
If the car itself won’t start, don’t begin by deleting CarPlay connections or changing a bunch of iPhone settings.
First make sure:
- The vehicle starts normally.
- The infotainment display turns on.
- The vehicle isn’t showing serious electrical warnings.
- The USB ports or wireless infotainment system have power.
Once those things are working, you can troubleshoot CarPlay.
If CarPlay works but you simply want to change how its apps appear, our guide to rearranging CarPlay apps on an iPhone explains where to find those controls.
Check Bluetooth After the Vehicle Starts
Bluetooth can also appear to malfunction when the vehicle has a broader electrical problem.
Once the car is operating normally, open the Settings app on your iPhone and select Bluetooth.
Check whether your vehicle appears under My Devices.
If it does but won’t connect, you can try reconnecting it.
If necessary, you can also remove the existing pairing and start over. Our guide on how to delete a Bluetooth device on an iPhone shows you how.
However, don’t delete saved Bluetooth connections while you’re still diagnosing a vehicle that won’t start. Your Bluetooth settings may be perfectly fine.
Consider the Car Battery
Modern cars have an enormous number of electronic components, but many of them still depend on a conventional 12-volt battery.
A weak battery doesn’t always produce a completely dead vehicle.
Instead, you might notice:
- Slow or unsuccessful starting
- Clicking sounds
- Flickering dashboard lights
- Strange warning messages
- Infotainment problems
- USB ports that don’t work
- Keyless-entry problems
- Electronic systems behaving unpredictably
Several technology problems appearing simultaneously can therefore be an important clue.
If your iPhone won’t charge, CarPlay won’t load, the dashboard is behaving strangely, and the vehicle won’t start, it’s unlikely that the iPhone caused all of those problems.
Investigate the vehicle’s power supply first.
Try Your Spare Key
If you have a spare key or key fob, try starting the vehicle with it.
This is an easy way to determine whether the original key could be contributing to the problem.
If the car starts normally with the spare key, replace the battery in your original key fob and test it again.
If neither key works, the problem is less likely to be the battery in one individual key fob.
Look for an Immobilizer or Security Warning
Modern vehicles commonly use an electronic immobilizer to prevent the engine from starting without an authorized key.
Look for a security symbol or warning on the dashboard.
If the vehicle doesn’t recognize the key, don’t keep pressing the Start button repeatedly.
Instead, try the manufacturer’s backup key-recognition procedure or your spare key.
Because the procedure differs considerably between vehicles, your owner’s manual is the best place to find the correct instructions.
Restart the Infotainment System After the Car Starts
Once the vehicle is running normally, you can focus on any remaining infotainment problems.
If the display is frozen or CarPlay still won’t connect, restarting the infotainment system may help.
The restart procedure depends on the vehicle. Some systems let you hold down a physical power button, while others require a specific button combination.
Check your owner’s manual rather than experimenting with random button combinations.
After the infotainment system restarts, reconnect your phone and test CarPlay and Bluetooth again.
Restart Your iPhone
If the car and infotainment system are working normally but your iPhone still won’t connect, restart the iPhone.
A temporary iOS, Bluetooth, or wireless connection problem can sometimes prevent the connection from being established.
After restarting your iPhone, allow the vehicle’s infotainment system to finish loading before trying again.
Check the USB Cable
For wired CarPlay, don’t overlook the cable.
Inspect it for:
- Fraying
- Bent connectors
- Loose connections
- Other visible damage
Try another known-working cable if one is available.
A cable can also charge a device without necessarily providing the data connection your particular infotainment setup requires, so charging alone doesn’t always prove the cable is suitable for a wired CarPlay connection.
Check Driving Focus If the Phone Seems Unusually Quiet
Sometimes the car works correctly, but your iPhone behaves differently once you start driving.
That can be related to Driving Focus rather than a vehicle problem.
Driving Focus can reduce distractions from calls, messages, and other notifications while you’re on the road.
If that’s the issue you’re experiencing, see our guide to disabling iPhone Driving Focus for more information.
Don’t change Driving Focus settings while actively driving. Make the adjustment while safely parked.
When to Stop Troubleshooting
Some problems aren’t appropriate for DIY technology troubleshooting.
Stop and consider roadside assistance or a qualified automotive technician if:
- The steering wheel won’t unlock using the normal procedure.
- A steering-lock or security warning won’t go away.
- The vehicle won’t recognize multiple authorized keys.
- You smell fuel or something burning.
- You see smoke.
- Battery cables or electrical components appear damaged.
- The vehicle starts and immediately shuts off.
- The engine cranks normally but repeatedly fails to start.
- Serious warning lights appear.
- The vehicle behaves unpredictably after a jump-start.
Hybrid and electric vehicles can also contain high-voltage systems. Don’t attempt to diagnose or repair high-voltage components yourself unless you’re appropriately trained.
How to Tell Whether It’s a Car Problem or a Technology Problem
One of the easiest ways to approach the situation is to consider how many things aren’t working.
If the vehicle starts normally and only CarPlay doesn’t work, concentrate on CarPlay, the phone, cable, and infotainment system.
If the vehicle starts normally but the phone doesn’t charge, check the USB port, charger, and cable.
If the vehicle doesn’t detect the key, focus on the key fob and the keyless entry system.
If the steering wheel is locked and the ignition won’t operate normally, investigate the steering lock.
But if the car won’t start and several unrelated electronic systems are malfunctioning at the same time, look for a broader electrical problem in the vehicle before troubleshooting each individual device.
Tips for Avoiding Car Technology Problems
A little preparation can make these problems much easier to handle.
- Keep a spare key-fob battery somewhere accessible outside the vehicle.
- Know whether your key fob contains a physical emergency key.
- Learn your vehicle’s emergency key-fob starting procedure.
- Keep a reliable phone cable in the car.
- Read the owner’s manual sections covering emergency starting and steering locks.
- Take a picture of unusual dashboard messages before they disappear.
- Don’t force an ignition key or locked steering wheel.
- Resolve vehicle power problems before resetting CarPlay or Bluetooth.
- Make changes to phone settings while parked rather than while driving.
Frequently Asked Questions
Why is my steering wheel locked and my car won’t start?
The vehicle’s steering lock may have engaged. This can happen when the steering wheel is moved after the vehicle is turned off. Applying gentle pressure to the wheel while following the vehicle’s normal starting procedure may release it. Check your owner’s manual if it remains locked.
Can a dead key-fob battery prevent my car from starting?
It can. A push-button-start vehicle needs to recognize an authorized key. Many vehicles provide a backup procedure to detect the key when the battery is weak or dead.
Can a weak car battery cause CarPlay problems?
A weak vehicle battery can contribute to broader electrical problems that affect the infotainment system and other electronics. If the vehicle has starting or power problems, address them before troubleshooting CarPlay.
Why won’t my iPhone charge when my car won’t start?
Some USB ports only receive power when the ignition is in the Accessory or On position. A vehicle with insufficient battery power may also be unable to operate its accessories normally.
Why does my dashboard turn on when my car won’t start?
There may be enough battery power to operate the dashboard electronics but not enough to start the vehicle. Key recognition, the steering lock, transmission position, starter, immobilizer, and other vehicle systems can also prevent the vehicle from starting.
Should I reset CarPlay if my car won’t start?
No. Fix the vehicle starting problem first. Resetting CarPlay won’t resolve a dead car battery, a locked steering wheel, an unrecognized key fob, or another vehicle-starting problem.
Summary
If your car won’t start and its technology isn’t behaving normally, work through the problem in this order:
- Make sure the transmission is in Park.
- Press the brake pedal firmly.
- Check whether the steering wheel is locked.
- Look for key-fob and security warnings.
- Try your spare key.
- Check the dashboard, headlights, and interior lights.
- Listen to what happens when you try to start the vehicle.
- Consider whether the 12-volt battery could be weak.
- Get the vehicle starting normally before troubleshooting CarPlay, Bluetooth, or USB connections.
- Seek professional assistance when the symptoms point to a more serious electrical or mechanical problem.
Conclusion
Cars increasingly depend on computers, wireless keys, electronic steering locks, touchscreens, USB connections, Bluetooth, and smartphone integration. Because these systems depend on one another, a problem that initially appears to be an iPhone or infotainment failure may actually originate elsewhere in the vehicle.
Start by determining what still works. Check the dashboard, steering wheel, key fob, shifter, lights, and the sounds the vehicle makes when you try to start it.
If the car starts normally but CarPlay or Bluetooth doesn’t work, you can focus on the phone and infotainment system. If the vehicle won’t start and several electronic systems are malfunctioning at once, investigate the vehicle’s electrical or starting system first.
Separating those two situations can save you from resetting your iPhone, deleting Bluetooth connections, or replacing cables that weren’t the cause of the problem.
Matt Jacobs has been working as an IT consultant for small businesses since receiving his Master’s degree in 2003. While he still does some consulting work, his primary focus now is on creating technology support content for SupportYourTech.com.
His work can be found on many websites and focuses on topics such as Microsoft Office, Apple devices, Android devices, Photoshop, and more.