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20 Irrefutable Myths About Fiat 500 Keys: Busted
Fiat Panda Key Fob Replacement

Fiat Panda keyfobs are equipped with a transponder which transmits signals from the fob to the car that allows it to unlock doors or start the motor. The fob can stop functioning for a variety of reasons.

The most common cause of key fob malfunction is a dead coin battery. Other causes include water damage malfunctioning receiver modules and signal interference.

Dead Coin Battery

If the battery in your key fob has failed, the initial step is to replace it. Use replacement fiat 500 key that has the same voltage, size and specifications as the old one.

If the key fob was exposed to water (such as saltwater or rain at the beach), it must be cleaned prior to using it again. A paper towel soaked with isopropyl alcohol or electronic cleaner will be the solution.

If the key fob has not been exposed to water but remains inoperable it could be a problem with the receiver module or an internal electronic chip. In these cases it is possible to re-programme the key fob with an OBDII scanner may help.

Water Damage

If your key fob's battery has taken an immersion in the puddle or pool or gone down the washing machine, you could be suffering some water damage. It's generally possible to get it back in working order by taking out the batteries and cleaning the circuit board with rubbing alcohol. It's a good idea to allow the fob to dry completely before putting in a brand new battery.

You may have a faulty module in the event that your key fob stops working after replacing the battery or updating. You can find reprogramming instructions for the majority of vehicles' remote key fobs on YouTube or in your owner's guide. You could also try resetting the car's onboard computer with the OBDII scan tool.

Faulty Receiver Module

The key fob is equipped with a chip that communicates with the vehicle's system. The chip will stop sending and receiving signals to the car if damaged. This could be due to dropping the key fob, or due to exposure to water. If your key fob stopped working due to exposure to water it is possible to fix it if you clean the chip with electronic cleaner or isopropyl ethanol.

If the key fob still does not respond after cleaning it, you can be sure that the receiver module is not functioning properly and must be replaced. A faulty receiver module can also cause the remote control key to not function. This is usually due to electromagnetic interference.

Faulty electronic chip

The electronic chip that is in your key fob is a vital function in the anti-theft security system of your vehicle. It transmits a message to the immobiliser inside your car to tell it whether the key is legitimate. The car won't start if the chip is damaged.

A malfunctioning chip could be caused by interference signals from objects such as weather conditions, objects or transmitters on the same frequency as your vehicle. In this scenario you'll require a new key fob.

Contacts to the battery are not working properly.

The battery contacts on the fob's battery can be damaged through heavy use. If they're bent, or damaged, the fob will not send any signals to the receiver modules in the vehicle.

Modern fobs are designed with rubber seals in order to keep out water. Immersing them in water, even if it's only small splash or drizzle could damage the chip's electronic circuit.

The key fob houses a chip that communicates with the vehicle's immobilizer system to start it. The system uses the old red keys for older vehicles or the cryptocoding system found in modern vehicles. This chip needs to be replaced if it's defective.

A faulty 12 Volt battery

A malfunctioning battery could cause the key fob to cease to function. When this happens, the car's computer system cannot recognize that the remote is inside the vehicle.

Test the battery with a voltmeter before replacing it to determine its capacity. A fully charged battery should read 12.6 volts. If the reading drops significantly, it's time to replace it.

Set an electrical load for a few seconds on the battery to test its capacity. This will remove one percent of the surface charges. After that, measure the voltage. The longer a battery can keep its voltage steady greater is its capacity. Ideally, it will remain at 12 volts or less for several minutes.

Radio Signal Faulty Radio Signal

This is the most common reason for the key fob not sending signals to the car. The battery can be replaced to solve this problem. It is important to buy batteries that have the same dimensions and voltage as the original.

Fobs take a lot of punishment, and aren't impervious to destruction. The battery contacts and buttons could be damaged through rough handling.

Other transmitters or objects using the same frequency could also interfere with the signal. For example, a light-control panel near your home may send interference over the same frequency that key fobs utilize. This can affect the remote control of your car.

Faulty OBDII Scan Tool

There are many reasons scanners don't function. Some are more complex than others.

Professional scan tools allow a mechanic to monitor the car's network and run a range of self-tests. These tools can save a lot of time, but are costly and are out of reach for most DIYers.


If your OBD2 scan tool doesn't turn on, check voltage at terminals 16 (scantool power) and 4 (chassis earth). If these are both present it's possible that a fuse has blown. This is one of the most frequent causes of a scan tool failing. It is typically easy to fix the issue by replacing the fuse that was blown.