My 2019 Car Wont Start But Keyfob Opens and Closes Doors

When my 2019 car wont start but keyfob opens closes the doors, it usually points to a few common culprits like a weak keyfob battery, immobilizer glitch, or ignition switch issue. The good news is you can often troubleshoot this yourself before calling a mechanic. This guide walks you through every likely cause and the simplest fix for each one.

There is nothing more frustrating than standing next to your car, pressing the keyfob, hearing the doors lock and unlock, and then turning the ignition — only to get silence. If my 2019 car wont start but keyfob opens closes the doors, you are not alone. This is a surprisingly common issue that many car owners face, especially with newer models that rely heavily on electronic systems.

The fact that your keyfob still works is actually a good clue. It tells you that the car’s battery has some charge and the electrical system is partially functioning. That means the problem is likely isolated to a specific component rather than a total electrical failure. Let us dig into what might be going wrong and how you can fix it.

Key Takeaways

• The keyfob still working means the car’s electrical system is partially alive, which narrows down the problem significantly.
• A dead keyfob battery is the most common and easiest fix — replacing it costs just a few dollars.
• Immobilizer or transponder issues can prevent the engine from starting even when the doors unlock fine.
• A failing ignition switch or starter motor could also cause this exact symptom set.
• You can try several DIY troubleshooting steps before needing a tow or professional help.
• Knowing when to call a professional saves time and prevents costly mistakes.

Why Does the Keyfob Work But the Car Won’t Start?

Understanding how your car’s smart key system works helps you figure out why the doors respond but the engine does not. When you press the keyfob, it sends a low-frequency signal to the car’s receiver. This signal unlocks the doors and arms the security system. But starting the engine requires a second, more complex handshake between the keyfob and the car’s immobilizer.

The immobilizer is an anti-theft feature that verifies the keyfob is genuine before allowing the engine to crank. If this verification fails — even slightly — the car will not start, even though the doors open just fine. Think of it like a bouncer at a club who lets you in but won’t let you past the velvet rope.

Several things can interrupt this handshake. A weak keyfob battery is the number one suspect. But there are other culprits too, including a faulty ignition switch, a dead starter motor, or a glitch in the car’s computer system. Let us look at each one in detail.

Common Causes and How to Fix Them

1. Weak or Dead Keyfob Battery

This is the most common reason for my 2019 car wont start but keyfob opens closes the doors. The battery that powers your keyfob typically lasts about two years. When it gets low, the signal weakens just enough to unlock the doors but not to start the engine.

Here is how to fix it:

• Check your owner’s manual for the correct battery type (usually CR2025 or CR2032).
• Open the keyfob casing with a small flathead screwdriver.
• Replace the old battery with a new one, matching the positive and negative sides correctly.
• Test the keyfob by standing close to the car and pressing the start button.

If replacing the battery does not work immediately, try holding the keyfob directly against the start button or the steering column area. Some cars have a backup antenna spot that reads the keyfob signal better when the battery is weak.

2. Immobilizer or Transponder Glitch

The transponder inside your keyfob communicates with the car’s immobilizer system. If this communication breaks down, the car will not start even though everything else works normally. This can happen after a battery change in the keyfob, or if the keyfob gets dropped or exposed to moisture.

Try these steps:

• Remove the keyfob battery for 30 seconds, then reinsert it.
• Stand right next to the car and press the start button firmly.
• If your car has a physical key slot, try inserting the keyfob directly into the slot.
• Check if the dashboard warning light for the immobilizer is flashing.

If the immobilizer light is blinking rapidly, the car is not recognizing the keyfob. A lost my only car key situation uses similar troubleshooting, but in your case the keyfob is present — it just needs to be re-synced sometimes.

3. Faulty Ignition Switch

The ignition switch is the component that sends power from the battery to the starter motor when you turn the key or press the start button. Over time, the internal contacts can wear out, especially in cars that are a few years old like 2019 models.

Signs of a failing ignition switch include:

• The dashboard lights come on, but the engine crumbles slowly or not at all.
• You hear a single click when pressing the start button but no cranking.
• The problem comes and goes — sometimes it works, sometimes it does not.

Replacing an ignition switch is a moderate repair that a qualified mechanic should handle. It typically costs between $100 and $250 for parts and labor combined.

4. Starter Motor Issues

The starter motor is what actually cranks the engine when you turn the key or press the start button. If it fails, you may hear a rapid clicking sound or complete silence when you try to start the car.

Here is a simple test you can do:

• Turn on the headlights.
• Try to start the car.
• If the headlights dim significantly or go out when you press the start button, the starter motor is likely drawing power but not engaging properly.
• If the headlights stay bright but the car does not crank, the starter motor may be completely dead.

In some cases, a 2022 Dodge Ram emergency start method can work temporarily — placing the keyfob against the push button firmly — but this is more of a workaround than a fix for a bad starter.

5. Electrical or Wiring Problems

Sometimes the issue is not a single component but a wiring problem. Corroded connectors, a loose ground wire, or a damaged harness can all cause the starting circuit to fail while leaving the door lock circuit intact. This is more common in cars that have been exposed to moisture or road salt.

Wiring issues require professional diagnosis. A mechanic can use a multimeter to trace the electrical path from the battery to the starter and identify exactly where the connection is failing.

Step-by-Step Troubleshooting Guide

Before you call a mechanic or pay for a tow, try this systematic approach to narrow down the problem. Each step builds on the last, so follow them in order.

1. Check the keyfob battery. Replace it with a fresh one. This fixes the problem more often than you might think.
2. Try the backup start method. Hold the keyfob directly against the start button or steering column area and press it.
3. Check the dashboard. Are there any warning lights? A flashing immobilizer light is a big clue.
4. Listen carefully when you press start. A single click, rapid clicking, or silence each point to different problems.
5. Try a spare keyfob if you have one. If the spare works, your original keyfob battery or transponder is the issue.
6. Check the battery terminals. Make sure they are clean and tight. Corrosion on the terminals can cause starting issues even when the keyfob works fine.
7. If none of the above works, it is time for a professional diagnosis.

Many people also find it helpful to learn how to disconnect car battery safely as a first step when dealing with electrical gremlins. A full reset of the car’s electrical system can sometimes clear up strange glitches that cause starting problems.

When Should You Call a Professional?

You should call a mechanic if you have tried the basic troubleshooting steps above and the car still will not start. Also call a professional if:

• You smell burning or see smoke under the hood.
• The car starts sometimes but not consistently — this suggests a progressive failure.
• Multiple electrical systems are acting up, not just the starting circuit.
• You have tried a spare keyfob and it also does not work.

Trying to fix wiring or ignition switch problems without proper training can lead to costly mistakes. A qualified mechanic has the diagnostic tools and experience to pinpoint the issue quickly and safely.

If your car is completely dead and you need to move it, remember that towing automatic car requires specific precautions. Always use a flatbed tow truck or follow the manufacturer’s guidelines for flat-towing to avoid damaging the transmission.

Prevention Tips to Avoid This Problem

The best way to deal with this issue is to prevent it from happening in the first place. Here are some simple habits that can help:

• Replace your keyfob battery every two years on a schedule, even if it still seems to work.
• Keep a spare keyfob in a safe place at home or in the office.
• Avoid placing the keyfob near strong magnets or electronic devices that can interfere with the signal.
• Keep the battery terminals clean and check them during regular oil changes.
• Have the electrical system inspected during routine maintenance visits.

These small habits take almost no time but can save you from a frustrating morning when your car just will not turn over.

Expert Insights

Experienced mechanics often say that the most common reason for a car that unlocks but will not start is the keyfob battery. It is a simple fix that people overlook because they assume the keyfob is fine. The second most common cause is the immobilizer not recognizing the keyfob, which can usually be resolved by a re-sync procedure.

For 2019 model year cars specifically, the electrical systems are generally reliable, but they are also more complex than older models. This means that when something does go wrong, it is often related to a sensor, a module, or a software glitch rather than a simple mechanical failure.

Key Takeaways

• The keyfob still working means the car’s electrical system is partially alive, which narrows down the problem significantly.
• A dead keyfob battery is the most common and easiest fix — replacing it costs just a few dollars.
• Immobilizer or transponder issues can prevent the engine from starting even when the doors unlock fine.
• A failing ignition switch or starter motor could also cause this exact symptom set.
• You can try several DIY troubleshooting steps before needing a tow or professional help.
• Knowing when to call a professional saves time and prevents costly mistakes.

Conclusion

Dealing with a car that will not start but whose keyfob still works is confusing at first, but the problem is usually straightforward once you know what to look for. The keyfob still functioning tells you that the car has power and the basic electrical system is working. That points the search toward the keyfob battery, the immobilizer system, the ignition switch, or the starter motor.

Start with the simplest fix — a new keyfob battery — and work your way through the troubleshooting steps. Most of the time, this resolves the issue without any expensive repairs. If the problem persists, do not hesitate to get a professional diagnosis. A qualified mechanic can pinpoint the exact cause and get you back on the road quickly.

Remember, my 2019 car wont start but keyfob opens closes the doors is a solvable problem. Stay patient, follow the steps in this guide, and you will likely find the answer without spending a fortune.

Frequently Asked Questions

Why does my keyfob open the doors but the car won’t start?

The door unlock function uses a different signal strength than the engine start function. A weak keyfob battery can send enough power to unlock the doors but not enough to pass the immobilizer verification needed to start the engine. Replacing the keyfob battery is the first thing you should try.

Can a dead keyfob battery cause a 2019 car not to start?

Absolutely. Even if the battery is not completely dead, a low charge can weaken the signal enough to prevent the car’s smart key system from recognizing the keyfob during the start sequence. This is the most common cause of this exact symptom in 2019 model year vehicles.

How do I know if the immobilizer is the problem?

Look for a flashing security or immobilizer light on the dashboard when you try to start the car. If you see this light and the engine does not crank at all, the immobilizer is likely not recognizing your keyfob. Try holding the keyfob directly against the start button or using a spare keyfob.

Is it safe to tow my car if it won’t start?

For automatic transmission vehicles, you should always use a flatbed tow truck. Towing with the wheels on the ground can damage the transmission. If you need to move the car, arrange for a flatbed or follow the manufacturer’s specific towing guidelines in the owner’s manual.

How much does it cost to fix a car that won’t start but has power?

The cost varies widely depending on the cause. A keyfob battery replacement costs about $5 to $10. An ignition switch replacement runs $100 to $250. A starter motor repair can range from $200 to $500. Electrical wiring repairs depend on the complexity of the issue and labor rates in your area.

Can cold weather cause my 2019 car not to start even with a working keyfob?

Yes, cold weather can worsen existing electrical weaknesses. Low temperatures reduce battery efficiency and can make a weak keyfob battery fail completely. If your car starts fine in warm weather but struggles in the cold, the keyfob battery or car battery may be reaching the end of its life.