Citroen C4 Key Fob Replacement
The Citroen C4 Picasso is a compact SUV that's small for a family vehicle, but has some genuinely innovative features. It has decent space for five people, and is a great way to get around the city.
Sometimes the key fob stops working due to pairing issues. This issue can be resolved if instructions are followed. For certain vehicles, a professional will be required to use specialized tools.
Dead coin battery
A dead battery is the most common problem that affects remote keys. It's an easy fix however. All you need to do is replace the coin battery. These batteries resemble tiny silver coins and can be purchased in your local automotive shop. Once you've replaced the battery, then you'll be able to lock and unlock your car.
Another reason why your key fob won't work is because of interference. This can be caused by various factors, including weather conditions, objects, or other transmitters on the same frequency. If this happens, it could be necessary to remove the key from the ignition and try again.
Another reason why your key fob won't work could be because the fob is not programmed properly. This could happen if the key is exposed to water or if it isn't removed correctly after replacing the battery. You can usually restore the programming by following the steps in the owner's manual. If you're not able to get it done, you can go to a dealer or professional locksmith to assist you.
Water damage
Citroen C4 has a high level of reliability, but it's still a complicated machine with hundreds of interconnected parts. It's not uncommon for a Citroen C4 to experience a breakdown. In some cases it is easy to get the issue solved. In some instances it is necessary to call for assistance or visit an expert. The most common reasons for why the C4's key fob ceases working are a dead coin battery water damage, signal interference, and receiver module issues.

Water damage can be caused by sweat or moisture on the circuit board. This could cause a short circuit in the circuit and result in the key fob becoming dead or causing battery drain. To prevent this from happening, try to keep your key fob safe from water or put it in a bag before you use it.
A multimeter can be used to measure the battery's voltage. A successful test will reveal values between 12 and 13. If your battery isn't producing these values, it could be defective. This means you'll have to change the battery.
The receiver module is not working properly.
A faulty receiver can cause the key fob to cease working. Citroen owners frequently experience this issue, since the keyfob has to send a signal to the door handle in order to unlock and start the vehicle. The key fob will not work if it fails to transmit the signal. It must be replaced. This is usually done at a vehicle dealership or by an experienced mechanic.
There are several different things that could go wrong with your Citroen C4 key fob. It could be due to a dead coin-cell battery or signal interference or water damage. To begin troubleshooting the issue, test the battery of your key fob and check for obvious signs. This can be done by taking the keyfob apart and removing its battery to have a better view.
Replace the battery in case it is depleted. Make sure that the new battery is of the same voltage, size, and specification. Also, make sure that the fob is securely connected prior to replacing it.
Faulty 12 volt battery
The majority of newer cars have key fobs that let you to lock and unlock the vehicle from some distance. These devices transmit a signal to the car to control the locks and operate on battery power. However, the batteries may fail over time. The good thing is that the replacement battery isn't expensive and easy to replace. You can take the fob out using a flat-bladed screwdriver, or you could find instructions in your owner's handbook.
Replace the battery by using a different one of the same type and size as the original. Different batteries can have different voltages which can cause your fob to stop functioning or display a low-battery alert. Remember to also orient the battery in a way that the plus and minus signs are in the same direction as the original. This will ensure that the chip is receiving the proper signals. The issue could also be due to a malfunctioning module. In this instance it is recommended to contact the dealer for further assistance and repairs.
Keys that are not paired require reconfiguring
Car key remotes might fail to function for a variety of reasons. Fortunately, the majority of these problems can be resolved quickly and easily. Most often, a dead coin-cell battery is the cause. This can be easily repaired in a matter of minutes at most auto part shops. It is essential that the new battery is installed correctly. Metal retaining clips must be properly tightened and contacts of the battery should be cleaned.
G28CarKeys is a faulty receiver module or signal interference. If the key fob isn't receiving a sufficient signal from the receiver, it may not be able to lock or unlock doors and start the car or use the hands-free system. In these cases you can reset the receiver by taking off the battery for a few minutes.
Smart keys, that have an integrated security chip that disables the vehicle's immobiliser system is more expensive than traditional keys made of metal and can cost up to $500 to replace. It is recommended to keep two keys working for your C4 in order to avoid the high cost. This replacement remote key fob has been restored and tested with new internal components before being shipped to you.