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Reasons Why Your Keyless Car Key Is No Longer Working

Posted on: May 16th, 2024 by guy hudson

Keyless entry systems have become a standard feature in today’s automotive landscape, , offering convenience and security to drivers. Keyless car keys, often in the form of key fobs or remotes, allow seamless access and operation of vehicles with the press of a button. However, encountering issues where your keyless car key stops working can be frustrating and inconvenient. Let’s explore the reasons behind this common problem and how to address it effectively.


Keyless Entry Systems


Keyless entry systems utilise radio frequency (RF) signals to communicate between the car and the key fob. When you approach your vehicle, the car detects the key fob’s presence and automatically unlocks the doors upon a touch or pull of the handle. Inside the vehicle, a push-button start system allows you to start the engine without physically inserting a key into the ignition.


The seamless operation of keyless entry systems relies heavily on the power supplied by the key fob battery. Key fobs transmit RF signals to the car to perform various functions, including locking/unlocking doors, opening the trunk, and starting the engine. A dead or weak battery can render these functions inoperable, leaving you stranded outside your vehicle.


7 Reasons Your Keyless Car Key Battery Is No Longer Working

  1. Low Battery Voltage


As key fob batteries age, their voltage gradually decreases, resulting in diminished performance. Signs of low battery voltage include reduced range or the key fob failing to operate keyless entry functions altogether. To maintain optimal performance, it’s important to replace key fob batteries periodically.


  1. Battery Corrosion


Moisture and exposure to air can lead to corrosion on the battery terminals of your key fob. This corrosion inhibits electrical conductivity, affecting the fob’s ability to transmit signals to your vehicle. Regular inspection and cleaning of battery terminals can help prevent this issue.


  1. Continuous Usage Draining the Battery


The more you use keyless functions like locking and unlocking your car, the quicker your key fob battery will drain. It’s essential to replace the battery regularly to ensure reliable performance and avoid unexpected failures.


  1. Exposure to Extreme Temperatures


Extreme temperatures, whether hot or cold, can significantly impact battery performance and lifespan. Avoid leaving your key fob in direct sunlight or exposed to harsh weather conditions to prolong battery life.


  1. Inadequate Maintenance


Neglecting to replace the key fob battery at recommended intervals can lead to downtime and inconvenience. Regularly inspecting and replacing the battery as needed is crucial for optimal keyless entry functionality.


  1. Faulty Battery Installation


Improper installation of a new battery can cause connectivity issues within the key fob. Always follow manufacturer guidelines when replacing batteries to ensure they are inserted correctly and securely.


  1. Manufacturer Defect


Although rare, key fobs may have inherent defects that affect battery performance. If you suspect a manufacturer defect, contact the vehicle manufacturer for warranty coverage or a replacement key fob.


Factors Contributing to Keyless Car Key Battery Drain


  1. Frequency of Keyless Entry Usage: The more you use keyless entry, the quicker the battery in your key fob may drain. Each time you press a button to lock or unlock your car, it activates the fob’s transmitter, consuming battery power.
  2. Environment: Extreme temperatures and high humidity levels can affect battery efficiency. Cold weather can cause batteries to discharge faster, while humidity can lead to corrosion within the key fob.
  3. Vehicle’s Proximity Sensor: Keyless entry systems are designed to activate when the key fob is within a certain proximity of the car. However, if the proximity sensor is overly sensitive or malfunctioning, it may constantly activate, draining the battery.
  4. Key Fob Design and Circuitry: Some key fobs are more energy-efficient than others due to their design and internal circuitry. Older or poorly designed fobs may drain batteries quicker.
  5. Radio Frequency Interference: Urban areas with high radio frequency interference can cause keyless entry systems to work harder to establish a connection with the vehicle, leading to increased battery usage.


Advantages of Identifying Vehicle System Issues Affecting Keyless Entry


Identifying and resolving vehicle system issues affecting keyless entry can yield numerous benefits that enhance the overall ownership experience:


  1. Diagnostic Alerts: When keyless entry system issues are detected early, diagnostic alerts can be triggered. This proactive approach enables timely repairs, preventing potential breakdowns or failures that could leave you stranded without access to your vehicle.
  2. Improved Safety: A properly functioning keyless entry system contributes to vehicle security. It reduces the risk of unauthorised access or theft by ensuring that the vehicle remains securely locked when not in use.
  3. Enhanced Performance: A reliable keyless entry system enhances the overall driving experience. It allows for seamless access to your vehicle without fumbling for keys, providing convenience and peace of mind.
  4. Preventive Maintenance: Addressing keyless entry issues proactively can prevent more significant problems from developing over time. By identifying and resolving issues early on, you can avoid costly repairs or component replacements down the road.
  5. Cost Savings: Proactively addressing battery drain and other keyless entry system issues can save you money in the long run. By avoiding unexpected failures and conducting timely maintenance, you can minimise replacement costs and reduce inconvenience.




Understanding the factors contributing to keyless car key battery drain is crucial for maintaining optimal car key functionality and vehicle security. By being aware of usage patterns, environmental influences, and potential system issues, car owners can take proactive steps to mitigate battery drain and ensure reliable keyless entry.


Regular maintenance and timely troubleshooting are key to preventing unexpected key fob failures. If you notice your car key remote behaving unusually or suspect a dead fob battery, it’s important to consult a professional for diagnostics and repairs.


For expert assistance with car key issues and maintenance in Nottingham, Derby, Leicester, Loughborough, and surrounding regions, Nottingham Car Keys is your trusted partner. They offer a comprehensive range of auto locksmith services, including vehicle entry, replacement car keys, key programming, and camper van keys. Their skilled technicians specialize in retrieving keys locked in cars, vans, and boots using advanced lock picking techniques. Additionally, they provide rapid response services daily for lost car keys in various locations.


Contact Nottingham Car Keys today via phone at 01159 843133, email at, or through their online quote request form. Ensure your key fob batteries are healthy and enjoy the convenience of seamless keyless entry. Stay informed, stay proactive, and drive with confidence!


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