Key Fob Battery Replacement Chrysler 300: Your DIY Guide to Staying in Control

Losing the ability to remotely lock, unlock, or panic your Chrysler 300 can be more than just an inconvenience – it can throw a wrench in your daily routine. Often, the culprit is a simple fix: a dead battery in your key fob. Replacing your Chrysler 300 key fob battery is a straightforward task you can easily handle at home, saving you time and money compared to dealership visits. This guide will walk you through the process of Chrysler 300 key fob battery replacement, troubleshooting potential issues, and ensuring your remote is working smoothly again.

Understanding Your Chrysler 300 Key Fob Battery

Chrysler 300 key fobs, like many modern car remotes, rely on small, coin-like batteries to power their functions. The specific battery type for most Chrysler 300 models is the CR2016 3V lithium battery. These batteries are readily available online, at auto parts stores, and even in most drugstores, making replacement convenient.

Why do these batteries need replacing? Key fob batteries, like all batteries, have a limited lifespan. Factors like usage frequency, temperature extremes, and even the quality of the original battery can affect how long they last. When your key fob starts to become less responsive, requiring you to be closer to your vehicle for it to work, or if functions become intermittent, it’s a strong sign that a battery replacement is due.

Step-by-Step Guide to Chrysler 300 Key Fob Battery Replacement

Replacing the battery in your Chrysler 300 key fob is a simple process that requires minimal tools and time. Here’s a step-by-step guide to help you through it:

What you’ll need:

A new CR2016 3V battery (it’s recommended to have two on hand in case of issues)
A small flathead screwdriver or a similar thin tool (like a butter knife or guitar pick)
A soft cloth to protect the key fob surface (optional)

Steps:

Locate the notch to open the key fob: Examine your Chrysler 300 key fob. You should find a small notch or seam, usually along the side or near the key ring attachment point. This is where you’ll insert your flathead screwdriver to open the fob.
Carefully pry open the key fob: Using your flathead screwdriver (wrapped in a soft cloth if you’re concerned about scratches), gently insert the tip into the notch. Twist the screwdriver carefully to pry the two halves of the key fob apart. Avoid using excessive force, as you could damage the plastic casing. The fob should split open relatively easily.
Identify the battery location and orientation: Once the key fob is open, you’ll see the battery compartment. Take note of how the old battery is positioned – specifically, which side is facing up (+ or -). This is crucial for correct installation of the new battery. Typically, the positive (+) side faces upwards.
Remove the old battery: You might be able to gently pry the old battery out with your fingertip or the edge of your screwdriver. Be careful not to damage the battery contacts inside the fob.
Insert the new CR2016 battery: Place the new CR2016 battery into the compartment, ensuring it’s in the same orientation as the old one you removed (positive side up in most cases). Push it down gently until it’s securely in place.
Reassemble the key fob: Carefully snap the two halves of the key fob back together. Press firmly until you hear or feel them click securely into place. Ensure there are no gaps and the fob is properly closed.
Test your key fob: Try using your key fob to lock and unlock your Chrysler 300, activate the panic button, and any other functions your fob has. If everything works as expected, you’ve successfully completed your Chrysler 300 key fob battery replacement!

A typical Chrysler 300 key fob, similar to the one discussed in the forum, ready for battery replacement.

Troubleshooting: Key Fob Not Working After Battery Replacement

In most cases, replacing the battery will immediately restore your Chrysler 300 key fob functionality. However, sometimes you might encounter issues even after a battery change. Here are common problems and how to troubleshoot them:

1. Incorrect Battery Installation:

Problem: The most common mistake is inserting the battery with the wrong polarity (positive and negative sides reversed).
Solution: Double-check the battery orientation in the battery compartment and ensure the new battery is placed exactly like the old one was removed. Take the battery out and re-insert it correctly.

2. Battery Compatibility and Voltage Issues:

Problem: Using the wrong type of battery or a battery with insufficient voltage can prevent the key fob from working.
Solution: Confirm you are using a CR2016 3V battery. While CR2032 batteries might physically fit, they are thicker and may not make proper contact, or could even damage the fob. Ensure the battery is new and from a reputable brand for optimal performance. Using a multimeter to check the voltage of the new battery can also be helpful if you suspect a faulty battery.

3. Key Fob Reprogramming (Potential Issue):

Problem: In some rare cases, disconnecting the battery for an extended period might cause the key fob to lose its programming, particularly in older models. While Chrysler 300 key fobs generally have non-volatile memory (meaning they shouldn’t lose programming from a simple battery change), it’s a possibility mentioned in the original forum discussion.
Solution: Try reprogramming your key fob. For Chrysler 300 models with an EVIC (Electronic Vehicle Information Center), you may be able to reprogram the key fob yourself.

How to potentially reprogram your Chrysler 300 Key Fob using EVIC (refer to your owner’s manual for specific instructions as procedures can slightly vary by year):
1. Enter your vehicle and close all doors.
2. Insert the key into the ignition and turn it to the “ON” position (without starting the engine).
3. Navigate through your EVIC menu using the buttons on your steering wheel until you find the “Vehicle Settings” or “Personal Settings” menu.
4. Look for options like “Remote Key Programming,” “Train Remote,” or similar wording.
5. Select the “Remote Key Programming” option and follow the on-screen prompts. These prompts usually involve pressing the Lock and Unlock buttons simultaneously on the key fob, followed by pressing the Unlock button again.
6. The EVIC should confirm successful programming with a chime or message.
7. Test your key fob to ensure it’s working.
If EVIC reprogramming fails or your model doesn’t have EVIC: You may need to visit a Chrysler dealership or a qualified automotive locksmith for professional key fob reprogramming.

4. Key Fob Damage:

Problem: If your key fob was dropped, exposed to moisture, or otherwise damaged prior to or during the battery replacement, internal components might be faulty.
Solution: Inspect the key fob circuit board for any visible damage. If damage is apparent, professional repair or key fob replacement may be necessary. Consider purchasing a new key fob and having it programmed to your vehicle.

Tips to Extend Your Key Fob Battery Life

While CR2016 batteries are relatively inexpensive, taking a few preventative measures can help prolong their lifespan and reduce the frequency of replacements:

Avoid Extreme Temperatures: Extreme heat or cold can negatively impact battery life. Try to avoid leaving your key fob in direct sunlight or freezing temperatures for extended periods.
Limit Excessive Button Presses: While occasional accidental presses are unavoidable, try to be mindful of pressing buttons unnecessarily when the key fob is not in range of the vehicle.
Consider a Spare Battery: Keeping a spare CR2016 battery at home or in your glove compartment can be a convenient backup, ensuring you’re prepared when your key fob battery eventually needs replacing.

Conclusion

Replacing the battery in your Chrysler 300 key fob is a simple DIY task that can save you from the frustration of a non-functional remote. By following these steps and troubleshooting tips, you can confidently handle this maintenance yourself. While key fob programming issues are uncommon after a battery change, being aware of the potential solutions, including EVIC reprogramming and professional services, ensures you’re equipped to handle any situation and stay in control of your Chrysler 300.