EMP Friendly Fire

I am not writing to give Halo 4 a hard time because I honestly am enjoying it. There is one thing though that every once in a while gets on my nerves. I am a fan of vehicles as I am sure most halo players are, but lately when I am in a vehicle the biggest worry I have is my own team EMPing me with a plasma pistol. Most of the time they do this continually until I get killed or just get out, and then they get the vehicle that they wanted. Since friendly fire is off, why do EMPs still affect my vehicle? Anyone else sick of this?