banks speed brake or B&D brake?

We purchased the Banks Brake last summer and it worked great on our trip back and forth through the Rockies. Our only issue was not being able to get service code numbers through OnStar because the Banks system doesn't allow OnStar to do a diagnostic report. We took our truck to Chevy and got the service codes (glow plugs) and decided to let them go for now since we don't drive in cold temps. Unfortunately we now need a smog certificate and have to get the glow plugs replaced. That brought the OnStar issue up again and when I contacted Banks about the problem they pointed out removing the in-line fuse (on the harness about 6" away from the module)de-activates the brake system and should allow OnStar access. We removed the fuse and by coincidence OnStar conducted their monthly diagnostic report the same day and it's the first full diagnostic report we've received since June. I also contacted OnStar and they were able to give me service codes for the two glow plugs we're having replaced tomorrow. We're going to leave the fuse out until we need the Banks Brake on our next vacation and even then it's good to know that if we have a service engine light we can pull the fuse and get OnStar to give us a code number. Hope this helps someone.