I had my turbo brake activated through EFI back in July and it's been working just fine. A couple of days ago it was about 18 degrees out and I noticed it wasn't working on my way to work. On my way home that same day it had warmed up to about 45 degrees and the turbo brake was working fine again. This morning it's about 32 degrees and it's not working again. It doesn't make sense to me but would the cold have any adverse effect on the TB working or would it be something else. I've done nothing to the truck since I installed the tunes. Any ideas?