Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Hi,Unfortunately there is not very much that is self serviceable on these keyless systems. The best you can hope for here is that the battery in the key has just started to fail. It is worth noting that when these begin to fail you may still have lock operation etc, just lose the keyless smart function alone.Before doing anything I would try replacing the battery in the key to see if there is improvement to the situation; if you have a second key that is working, you can try swapping the batteries between them to see if the problem follows the battery.Beyond that you will be down to a trip to the Mitsubishi store unfortunately; one of two things will happened most likely, either the key has failed entirely or the code got out of sync and needs to be resynchronized with the computer. While it is possible to have a WCM failure or antenna failure and so forth it is not likely nor common. More often than not the issue will be the key going out of sync, though the keys do fail of course. Moving forward the Mitsubishi store can attempt to reprogram (synchronize) the key first... if it takes, you will be on your way but should remain aware that it is possible if not likely the problem will return. If the key has not been exposed to heavy magnetism or mixed up with other wireless keys (sometimes causes issues), then the loss of sync is usually a precursor to failure. If the key will not program, then a brief inspection of the system would be in order before replacing the key.