Two problems related to horn assembly have been reported for the 2018 Subaru Outback. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Subaru Outback based on all problems reported for the 2018 Outback.
When I turn on the hazard emergency flashing lights on while parked and engine off and I lock the car , both keyless remotes stop working when I try to unlock the doors to enter. To be able to access car need to use the manual key, alarm horn goes off and then push the engine start button and all seems to work fine again. Has happened multiple times.
After putting on hazard switch and leaving vehicle, I came back to vehicle and the keyless entry would not function. System did not seem to recognize my smartkey as the door handle sensor did not operate. I tried the buttons on the smartly fob and they too did not function. Also tried the mobile remote app and that too failed. I had to use the mechanical key to enter vehicle. Of course the security horn goes off, but strangely I was able to start vehicle so system was able to recognize my smartkey after entry. Problem seems to only occur after a specific time period. If I put on the hazards and come back in a couple minutes, system works normally. It seems to occur around the five to 10 minute time frame.