Why is my Honda keyless start not working?

In most cases, a non-responsive Honda push-button start comes down to simple, fixable causes like a dead key fob battery or a weak car battery, or the car not detecting the key inside the cabin. Start by checking the fob and battery, then move through a few basic steps to confirm the system is functioning as designed.

Common causes to check

These are the frequent culprits behind a keyless start that won’t respond, listed so you can quickly identify which one applies to your situation:

• Dead or weak key fob battery, preventing the car from recognizing the key


• Weak or dead 12-volt car battery, which powers the Start button and the security system


• The vehicle isn’t detecting the key because it is out of range or the fob is blocked by a pocket, bag, or metal


• Brake pedal not fully depressed, or a faulty brake pedal switch that signals the car is not being braked


• Gear not in Park (automatic) or in the correct position for starting


• Immobilizer or security-system issue where the key is not recognized by the ECU


• Malfunctioning Start/Stop button, ignition module, or related wiring


• Blown fuses or a software glitch requiring a dealer update or reset

Understanding these common causes helps you prioritize what to test first and what to bring to a service visit if needed.

Troubleshooting steps you can perform at home

To diagnose and potentially fix the problem without professional help, follow these steps in order:

1. Replace the key fob battery. Use a small flat tool to open the fob and replace the CR2032 battery, then re-test the Start button.


2. Try a spare key fob. If the spare works, the primary fob is the likely issue and may need reprogramming or replacement.


3. Check the 12-volt car battery. Look for dim interior lights or sluggish dash illumination; if the voltage is low, you may need a jump-start or battery replacement.


4. Confirm the key is inside the cabin and the car is within range. Keep the fob away from metal objects and large electronic devices that could interfere with detection.


5. Depress the brake pedal firmly and ensure it is not stuck or experiencing an electrical fault. Some models require a solid brake press to enable Start.


6. Make sure the transmission is in Park (automatic) or neutral (manual). If the car senses it is in gear, the Start button may not engage.


7. Check for obvious fuses related to ignition, Start/Stop, and accessories. If any are blown, replace them with the correct rated fuse.


8. See if there is a software or recall notice. Some models receive updates that affect the push-button system; consult your dealer or Honda owner portal for TSBs (Technical Service Bulletins).

These steps cover the most common, low-cost fixes and help you determine whether a visit to a dealer or repair shop is necessary.

When to seek professional help

If the Start button remains inactive after completing basic troubleshooting, it’s time to contact a Honda dealer or a qualified automotive technician. Bring your vehicle registration, owner’s manual, and if possible, the spare key fob. A technician can diagnose immobilizer faults, reprogram key fobs, test the Start/Stop module, check for software updates, and inspect wiring and fuses with proper diagnostic tools.

Model-specific notes

While the above covers generic causes, some Honda models have unique nuances. For example, certain years of Civic, CR-V, or Accord with Smart Entry may require a specific sequence to enable the push-button start after a battery service or immobilizer reset. If you notice repeated failures after battery work or a recent software update, reference your model’s user manual or contact the dealership for model-specific guidance.

Summary

A non-working Honda keyless start is most often caused by a weak key fob battery, a low car battery, or the car not detecting the key. Start with the simplest fixes—replace the fob battery, try a spare key, and check the car battery and fuses—then verify the brake, gear position, and key range. If the issue persists, professional diagnosis is recommended to check immobilizer systems, the start button module, and any relevant software updates.

Can you manually start a push button start car?

Yes, you can manually start a push-button start car, typically by using the physical key fob against the start button if the fob battery is dead, or by finding a hidden backup slot in the car to insert the fob. For a push-start (bump-start) situation, you can do it on a manual transmission car, but you can't push-start an automatic. 
If the key fob battery is dead
This video demonstrates how to start a push-button car with a dead key fob: 56sJMG ENTERPRISES YouTube · Jul 23, 2021

• Press the fob against the start button: Hold the key fob directly against the push-button start and press the button. The car can recognize the fob's passive signal to start the engine. 
• Use a backup slot: Some cars have a hidden backup slot or area for the fob. You may need to refer to your car's manual to find the exact location, which is often in the center console, glove box, or near the steering column. 
• Turn the key: Some fobs have a physical key hidden inside. You can pull it out to unlock the car door, but you'll still need to find the backup slot or use the fob-against-button method to start the engine. 

If the car is a manual and needs to be push-started
This video explains how to bump-start a manual transmission car: 11sMyCarDoesWhatYouTube · Jun 12, 2015

1. Get the car rolling: Have a helper push the car to a speed of at least 5-10 mph. 
2. Turn the ignition on: With the clutch pedal pressed down, push the start button. The car may not start immediately, but the ignition will turn on, providing power to the engine control unit and other systems. 
3. Engage the gear: With the car moving, release the clutch and shift into a gear (second is usually best). 
4. Pop the clutch: Once you've engaged the gear, the car should start. The engine will turn on, and you can put it in a higher gear as needed. 

Important considerations

• Automatic transmissions: Do not attempt to push-start a car with an automatic transmission, as it can damage the transmission. 
• Manual transmissions: This method only works for manual transmission vehicles. 
• Consult your manual: The exact method for starting with a dead fob or finding a backup slot can vary by car model. Always consult your owner's manual for specific instructions. 

How much does it cost to replace a push button start on a Honda?

Cost by type of ignition switch system
For example, a replacement push-to-start button for a Honda Accord costs about $25, and an entire push-to-start ignition kit costs about $140.

What to do if keyless start doesn't work?

When a keyless car won't start, first try the simple solutions like pressing the brake pedal firmly, replacing the key fob battery, or holding the fob directly against the start button to bypass a weak signal. If these don't work, check for a weak car battery and a full battery charge as these are common issues. If the problem persists, it could be a faulty ignition cylinder, a lost key fob pairing, or a broken starter and you should contact a professional for diagnosis and repair. 
This video demonstrates how to start a car with a dead key fob: 1mOnline Mechanic TipsYouTube · Jul 27, 2020
Quick fixes to try first

• Ensure you're pressing the brake pedal firmly: This is a required step for most keyless start systems, and it's a common oversight. 
• Check the key fob battery: A weak fob battery is a very common culprit. Try replacing the battery in your key fob. 
• Use the backup starting method: Every keyless fob has a hidden physical key or an emergency start function. Place the fob directly against the push-to-start button and try to start the car. 
• Test the second key fob: If you have another fob, try using it. If it works, you know the issue is with the first fob and not the car itself. 
• Restart the car: Sometimes a simple reboot of the system can resolve the issue. Try turning the car completely off and then starting it again. 

You can watch this video to learn how to replace the battery in your key fob: 58sDriveTalkCarsYouTube · Nov 24, 2020
Potential causes and next steps

• Dead car battery: A low car battery can prevent the car from starting, even if the key fob is working correctly. If the dash lights come on dimly or the car is completely unresponsive, a jump-start may be needed. 
• Key fob interference: Sometimes, signal interference from other electronic devices or tall buildings can prevent the car from detecting the fob. Try moving the car to an open area to test this. 
• Lost key fob programming: The key fob may need to be reprogrammed to the vehicle, which can sometimes happen after a battery change or if the car has been unused for a long time. Many vehicles require a dealer or locksmith to do this. 
• Other mechanical or electrical issues: If the above steps don't work, the problem could be a faulty starter, broken ignition switch, or other electrical issues. In this case, it's best to have a professional mechanic diagnose and repair the problem. 

How to fix keyless start system problem Honda?

Fixing a Keyless Start System Problem

1. Change your key fob batteries. The first thing to try when you get this error message is switching out your batteries.
2. Warm up your car.
3. Turn on the engine start/stop system.
4. Replace a faulty switch or blown fuse.
5. Claim a warranty for other issues.