Why Your Car Key Might Not Be Working—and What to Do About It

There’s nothing more frustrating than turning the key in your car’s ignition—or pressing the unlock button—only to get silence (or worse, a clicking noise). You probably depend on your car key more than you realize, and when it stops working, the disruption can throw off your entire day.

If you’re wondering, “Why isn’t my car key working?” you’re not alone. At Locksmiths of Detroit, we hear this question all the time. 

Let’s break down the common reasons behind key issues and show you what you can do about them, whether you’re dealing with a traditional key, a transponder, or a key fob.

Common Reasons Your Car Key Isn’t Working

There are more possibilities than you might expect. Understanding the likely causes is the first step to a solution.

1. The Key Is Physically Damaged or Worn

Over time, keys get worn down from regular use. Tiny notches get dull, the grooves flatten out, or the metal can even bend slightly. That’s enough to keep it from turning in the ignition or opening your doors.

Signs your key might be damaged:

• You have to jiggle the key to make it work
• It turns partway, then gets stuck
• The key looks bent or has visible wear

What to do:

Avoid forcing the key. Instead, try using a spare if you have one. If the spare works properly, it’s time to have a replacement made from that key. Don’t duplicate a worn-out key—always use the best available model.

2. The Lock or Ignition Is Faulty

It might not be the key at all. Locks and ignition cylinders can wear out, especially in older vehicles or in areas like Detroit where weather extremes take a toll.

You might be dealing with a faulty lock if:

• The key turns, but nothing happens
• You hear clicks, but the door doesn’t unlock
• The key won’t fully insert into the ignition

What to do:

Try lubricating the lock with graphite-based lubricant (not WD-40). If that doesn’t help, you may need professional help. A locksmith can inspect both your key and the lock cylinder.

3. The Transponder Chip Isn’t Communicating

Most modern car keys have a transponder chip that “talks” to your car’s anti-theft system. If there’s a communication failure between the key and vehicle, the engine won’t start—even if the key fits perfectly.

Possible causes include:

• A damaged or cracked chip (from drops or wear)
• The chip has been deactivated
• Interference from other electronics nearby

What to do:

• Try a backup key if you have one
• Move away from power sources or electronics that could cause interference
• If both keys fail, the immobilizer module or the transponder chip may need reprogramming

4. The Key Fob Battery Is Dead

This is a common issue with push-start cars or remote-access keys. The battery inside your key fob can die without much warning.

Symptoms of a dead fob battery:

• The key buttons don’t respond
• You can’t unlock or start the car remotely
• A dashboard indicator shows “key not detected.”

What to do:

• Replace the battery (usually a CR2032, but check your owner’s manual)
• Try holding the fob close to the start button—some cars still respond with a weak battery
• If replacing the battery doesn’t work, you may need to reprogram the fob

5. The Key Is Not Programmed (Or Was Deprogrammed)

If you’ve just gotten a new key made—or you’re using a spare that hasn’t been used in a while—it may not be synced with your car.

This is especially true for:

• Laser-cut or transponder keys
• Replacement fobs bought online
• Used remotes from other vehicles

You’ll likely notice:

• The key fits but doesn’t start the car
• Push-button start fails to recognize the fob
• The unlocking function doesn’t work

What to do:

Reprogramming may be required. Some vehicles allow DIY programming (check your manual), but many will need a locksmith with proper tools to sync the key or fob.

Quick Troubleshooting Guide

Here’s a simple table to help you self-diagnose the issue based on symptoms:

When to Call a Local Detroit Locksmith

If you’ve tried all the steps above and you’re still stuck, it’s time to call in help. Here’s when a professional locksmith like Locksmiths of Detroit is your best bet:

• You’ve lost all copies of your key or remote
• Your ignition has stopped working entirely
• The fob or transponder needs reprogramming
• You suspect your key has been cloned or compromised
• You’re locked out of your car altogether

Why Choose a Local Locksmith?

Choosing a Detroit-based locksmith gives you a few advantages:

• Faster response time: We know Detroit streets, traffic, and neighborhoods.
• Familiarity with local conditions: Cold weather, salt, and theft risks are all part of car life here.
• Support for local business: We aren’t part of a national chain. We rely on our reputation and community referrals.

Prevent Future Key Problems

Once your current issue is sorted, a little prevention can go a long way. Here are a few tips to avoid getting stranded again:

1. Keep a Spare Key—Always

Have at least one working spare. Keep it somewhere secure (and not in the glovebox). If possible, give a trusted friend or family member access in case of emergency.

2. Replace Fob Batteries Yearly

Don’t wait for your remote to die. Replace the battery once a year, especially before winter hits.

3. Avoid Water and Impact Damage

Transponder chips and fobs are sensitive. Dropping them, swimming with them in your pocket, or exposing them to moisture can ruin the internal electronics.

4. Watch for Early Warning Signs

If your key is starting to act “weird”—jiggly, unresponsive, hit-or-miss—it’s best to get it checked before it stops working entirely.

FAQs

How much does a replacement car key cost?

It depends on your vehicle type. A basic key copy can be under $50, while laser-cut, transponder, or remote-start keys can range from $100 to $400 when programming is included.

Can I program a new key myself?

Some vehicles allow DIY programming, especially for older models. You’ll usually need at least one working key to initiate pairing. For newer systems, specialized tools may be required.

Can a locksmith in Detroit fix my car key on-site?

Yes. Mobile locksmiths like Locksmiths of Detroit come to you with all the necessary tools to cut, program, or reprogram car keys on the spot.

Final Thoughts

A malfunctioning car key can ruin your day, but the good news is, in most cases, it’s a fixable problem. Start by checking for obvious issues like a dead battery or a worn key. Don’t hesitate to test your spare or try basic solutions like key fob reboots or lock lubrication.

And if you’re still stuck? Don’t panic. Locksmiths of Detroit is ready to help, wherever you are in the city. Being locked out or stuck with a non-starting car is frustrating, but with expert help just a phone call away, it doesn’t have to ruin your week.

Need professional help with your car key in Detroit? Give Locksmiths of Detroit a call today and let us take care of it. Meanwhile, follow our blog for more helpful tips and advice on how to keep your keys—and your day—running smoothly.