Originally Posted by Rmebucky
I started having intermittent passive entry problems a month ago. the doors would not open by touch or close by pushing the button. The next day they would. There became a number of intermittent circumstances related to the issue. I was going to take the car in but persisted on my own. To date, I am not fully convinced that I have solved the problem but I am hopeful.
The solution may be that my wife's FOB, which has a huge array of chain and other metal on it, interferes with the system and shuts down the portion related to the passive key operation; causing it to malfunction and display the message "service FOB key".
Is that possible? I have gotten to the point where all remains in good working order with both FOBs if her keychain trinkets are not on her FOB.
An update to the above problem. I was wrong about the keychain but I am making progress. After working for most of a day, it quit again. I finely took it in and they replaced the antenna. That afternoon, I drove it home and all was good. The next morning, still good and we went golfing. After golf,the passive entry would not work; I only got the service message. That was Saturday. Sunday morning it worked, with both FOBs. I tested it a number of times and it always worked. At noon, after the sun got high and warm, it quit.
Deduction: good in the early hours of the day and, as the car interior warms, the heat effects whatever circuitry runs the device. I tested this theory for two days and took it in yesterday. Initially, the entry was working and the garage had to put it out in the lot and warm it up to get it to fail.
Currently, they have contacted the factory to get more info on exactly what piece of circuitry has to be replaced.
By the way, my car is a 2014 Jeep Grand Cherokee, Limited and I live in Sparks, Nv. Current weather is mid 30's in the morning and 60's in the afternoon with lots of sun.