How to solve the P1624 trouble code?
3 Answers
P1624 trouble code solution is as follows: 1. The malfunction indicator light is on, but there is actually no problem with the car itself. Since the ECU can only recognize voltage, occasional voltage fluctuations may also be judged as a fault by the ECU, which then illuminates the warning light and records the code. However, this doesn't actually affect the vehicle. In this case, simply use an OBD scanner to clear the trouble code. 2. The warning light comes on intermittently, and the fault appears occasionally. A common situation: loose wiring harness of a certain sensor, poor contact of a connector, or intermittent signal transmission falls into this category.
I've been repairing cars for over 20 years, and here's the common approach to handling the P1624 trouble code: P1624 indicates that the anti-theft system doesn't recognize the key, which could mean a faulty key chip or system issue. First, use a diagnostic scanner to confirm the code—don't just guess. Then try replacing the key battery, as many problems stem from a drained small battery. If that doesn't work, check the key coil and antenna, as aging or loosening can weaken the signal. The anti-theft control module might also be faulty, requiring key reprogramming or replacement. I recommend visiting a professional shop for computer programming—don't attempt DIY fixes for convenience at the expense of safety. Always lock your car after parking to prevent battery drain from accelerating issues. Regularly checking your key's condition can help prevent this problem.
Last time my car threw a P1624 code and wouldn't start, which really scared me. After some research, I learned it meant the key was rejected by the anti-theft system, possibly due to chip wear from long-term use. I immediately tried the spare key, and switching it worked right away; if that doesn't help, try replacing the battery—it's just a few bucks. Don't rush to drive if it happens on the road; safely pull over to check, and if it still doesn't work, have it towed to a repair shop for the mechanic to adjust the anti-theft module. This trouble code can be minor or serious, and ignoring it might lead to bigger issues, so stay calm and prioritize your safety. My advice is to avoid frequently exposing your key to water or dropping it to minimize damage.
