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Going On this site are equipped with a transponder which transmits a signal from the fob to the car that allows it to unlock doors or turn on the motor. However, the fob can stop working for several reasons. The most common cause of key fob malfunction is a dead coin battery. Other causes include water damage, a faulty module, and interference signals. Dead Coin Battery If your key fob battery has failed, the initial thing to do is replace it. Make use of a button cell battery with the same voltage, size and specifications as the previous one. If the key fob was exposed to water (such as saltwater or rain at the beach), it must be cleaned before using again. The best solution is to use the paper towel and soak it in isopropyl or an electronic cleaner. If the key fob isn't working despite being not exposed to water, it could be due a malfunction in the receiver module or in the internal electronic chip. Reprogramming the keyfob with an OBDII scan could aid in these situations. Water Damage If your key fob has gotten a bath in the pool or puddle, or taken a trip to the washing machine, you might have some water damage. It's possible to get it back in working order by taking out the batteries and cleaning the circuit board with ruby alcohol. It is recommended to let the circuit board completely dry before putting in batteries. There could be a problem with the module in the event that your key fob stops working after replacing the battery or reprogramming. There are reprogramming guidelines for most remote key fobs on YouTube or in the owner's guide. You can also reset the computer of your car using the OBDII scanner tool. Faulty Receiver Module The key fob contains an electronic chip that communicates with the car's system. This chip will stop sending and receiving signals to the car if it becomes damaged. Dropping the key fob could cause this, as well as water exposure. If the key fob stopped working after water exposure it is possible to repair the issue by cleaning or cleaning the chip with isopropyl alcohol or electronic cleaner. However, if the key fob is still unable to not respond after cleaning it, then it is likely that the module is faulty and will need to be replaced. A malfunctioning receiver module could also cause the remote control key to cease functioning. This usually happens due to electromagnetic interference. Faulty Electronic Chip The electronic chip in the key fob is a vital part of the anti-theft system in your car. It sends a signal the immobiliser device in your car to inform it whether or not the key is genuine. The car won't start in the event that the chip has been damaged. A malfunctioning chip can be caused by interference caused by objects, bad weather or transmitters located near your vehicle. In this instance an upgrade to the fob will be needed. Contacts to the battery are not working properly. The battery contacts of the fob's battery can be damaged by excessive usage. If they're broken or bent, the fob won't send any signals to the receiver modules inside the car. Modern fobs are constructed with rubber seals to keep out water. In the event of submerging them in water, even if it is just an occasional drizzle or splash can harm the electronic chip. The key fob comes with a chip which communicates with the immobilizer system of the vehicle in order to start it. This system utilizes cryptocoding systems in modern vehicles or the red key system used in older models. If the chip is not working properly and needs to be replaced. The 12 Volt Battery is faulty A malfunctioning battery could cause the key fob not to function. When this happens, the car's computer system will not recognize that the remote is inside the vehicle. Test the battery using the help of a voltmeter to determine its capacity. A fully charged battery should display 12.6 volts. If the reading falls significantly, it's time to replace it. To test the battery's power, place an electrical load on it for a few minutes. This will take away one percent of the surface charges. Then, measure the voltage again. The longer a battery can hold its voltage and the higher its capacity. Ideal is to hold close to 12 volts for several minutes. Radio Signal Faulty Radio Signal This is the main reason for a key fob that stops sending signals to the car. This issue can be fixed by replacing the battery. It is crucial to buy batteries that have the same dimensions and voltage as the original. Fobs can take a lot abuse, and they aren't impervious to destruction. The battery contacts and buttons could be damaged through rough handling. A signal can also be impacted by other transmitters or objects that operate on the same frequency. A light-control panel at your home, for example can interfere with key fobs using the same frequency. This could cause interference with your car's remote control. Faulty OBDII scan tool There are many reasons a scanner tool may not perform. Some are more complicated than others. Professional scan tools allow a mechanic to examine the car's systems and run a range of self-tests. These are real time-savers, but they are also extremely expensive, and out of the range of most DIYers. If your OBD2 scanner isn't turning on Check the voltage on terminal 16 (scan tool power) and terminal 4 (chassis ground). If these are both present it's possible that a fuse has failed. This is one of the most common reasons for failure of the scanner. The simple fix is usually to replace the fuse that has been blown.