Hello, first time posting here. I am a service tech with a Jungheinrich dealer. I have been dealing with an EFG220 that will intermittently throw code 4123.11. This code shows when the controller does not receive feedback from the park brake switches within 500 milliseconds. These two switches must work simultaneously. Originally the truck had a couple of other codes including the 4123.11 and it was determined that the controller was faulty. The controller was replaced and all codes except the 4123.11 went away. Park brake switches have also been replaced. The brake coil resistance is within spec and the switches are getting the proper voltage. The truck will work fine for awhile then throw the code.This happens when the truck is moving, or when key is cycled On. I've also had it show after a minute of turning the key to On without moving the truck. If the code only showed while traveling, I would say its a wire or connection issue. The fact that the code will will also show without the truck moving makes this issue more confusing. When the code shows, the way to clear it is to turn the key Off, hold park brake button, then turn key to On while still holding the park brake button. Has anyone dealt with this issue? Any help would be appreciated. Thanks!