What are the reasons for a car key having power but not being detected and unable to start the car?
2 Answers
There are many reasons why a car key has power but cannot be detected. The specific analysis is as follows: Car key malfunction: The malfunction of the car key may be caused by damage to the internal circuit due to mechanical impact or burning of the transmitter components after water ingress. Electromagnetic interference: If the environment where the car owner is located has electromagnetic interference, it can cause signal transmission disorder, making it impossible to accurately identify the car key signal. Poor soldering in the power distribution box: Poor contact caused by poor soldering can also lead to the failure of the sensor. The most "down-to-earth" method is to gently tap the power distribution box with your hand, which may reconnect the poorly soldered points. However, this is not a long-term solution, and it is still necessary to go to a professional repair shop for repair. Sensor module failure: The failure of the sensor module is equivalent to directly losing the "connection" object, and the signal emitted by the car key is invalid at this time.
That day I happened to encounter this issue - the key had fresh batteries but the car just couldn't detect it to start, which was really annoying. The main problem might be the identification chip in the key itself malfunctioning; these things tend to wear out over time, especially when the key is frequently dropped or gets wet. On the vehicle side, the induction receiver module near the handle could be the culprit if it's damp, has aging/ damaged antennas. Environmental interference is crucial too - like placing phones near the key/car or having strong electrical equipment nearby may cause signal blockage. For solutions, I've tried pressing the key against the start button for several seconds to sometimes wake the system; or attempting to re-pair the key with the vehicle (usually requiring professional tools). It's good practice to carry a spare key to avoid delays. During routine maintenance, have technicians check the key signal strength to prevent many headaches.
