What to Do When a Car Key Falls into Water?

[OCole]

If your car key falls into water, do not press any buttons immediately, as this can cause water to seep into the inner layers more quickly. First, use a dry cloth or paper towel to wipe the surface clean. If you have previously replaced the battery, open the key casing, remove the battery, and use absorbent paper towels to dry any internal moisture. Then, gently wipe the internal button contacts and other parts with high-concentration alcohol and allow it to air dry before reinstalling the battery. Additionally, car owners can place the key in a breathable bag and then put it into a dry rice container, as rice is highly absorbent and can help remove moisture.

[LucasDella]

I just helped a friend deal with a key that got wet. After the key fell into water, it was immediately retrieved, and buttons were not pressed to prevent further water ingress and short circuits. Electronic keys have miniature circuits, and water immersion can easily corrode components, leading to malfunction. First, use a dry cloth to wipe the surface dry. If the key can be disassembled, carefully remove the outer shell and use a cotton swab to clean internal water stains. Then, place it in a bag of rice or a silica gel moisture-proof box to absorb moisture for more than 24 hours. Avoid direct sunlight during this time, as high temperatures can accelerate damage. After it's completely dry, reassemble and test the buttons. If the light doesn't turn on or the car doesn't respond, the battery may have short-circuited due to water damage and needs replacement. It's advisable to buy a waterproof key cover as a preventive measure. If the key is completely damaged, you'll need to visit a 4S store to get a new one, which can be costly and time-consuming. Keeping a spare mechanical key in the car is the safest precaution.

[StCharles]

My car key fell into a puddle last week, and I immediately fished it out and dried the exterior with a paper towel. Don’t rush to press any buttons, as water seeping into the circuitry can cause permanent damage. I found that disassembling the key for simple treatment is quite effective: gently wipe the components with a soft cloth, then use a hairdryer on the low-heat setting to slowly dry any moisture in the gaps. Placing it in a sealed container with desiccant is even safer. Wait about a day before testing its functionality—if the remote stops working, check if the battery has corroded. I’ve learned that taking extra time to ensure it’s completely dry avoids repeated rework. For prevention, opt for a splash-proof key design to reduce risks or use a silicone protective case. If the key is beyond repair, don’t rush to drive—contacting a professional technician is safer and more hassle-free.

[AmyFitz]

Don't panic if your key gets wet. Last time mine got wet, I quickly dried it without pressing any buttons. Electronic keys are most afraid of water corrosion, so drying is crucial. Simply placing it in a rice bucket overnight can absorb the moisture. If the buttons don't work, it might be a short circuit in the circuit, so try replacing the battery. Prevention: Use a waterproof keychain or plastic cover. It can be troublesome if it breaks.