So here I would like to share my experience disabling F55 and
reflashing DBS using GM Tech2 scan tool. I have a 2005 c5 F55 with
heads, cam, injectors, etc. tuned with HP tuners. I did some search
about having the DBS reflash and F55 disable done and I read in a couple
blogs and threads that people are unsure whether the DBS reflash or any
other BCM changes will affect custom ECU tunes. I had the tech do these
two changes to the BCM and checked the car after each.
Disclaimer:
Please strictly follow the steps in case anything goes wrong. The F55
disabling and DBS reflashing are on your own risk.
First I had the tech do the DBS reflash for me in about 10 min. My tune was NOT affected and the car started and ran normally.
I then had him disable the F55 suspension. Again, my tune was NOT affected and the car started and ran normally.
It is also worth noting that HP Tuners can NOT make changes to the BCM.
If you are looking to disable your F55 using the TECH 2 scanner:
1.Hook up Tech 2, turn car ON, make sure module in the rear is PLUGGED IN. Do Not unplug the rear module.
2.Go to diagnostics -- Body --- BCM --- BCM Special functions -- BCM Setup.
3.Delete the F45 option ( F55 did not appear on the menu screen on the Tech 2, use F45)
4.Save new configuration.
5.Do not turn car off, do not remove
Tech 2, go to the module in the rear of the car, unplug the grey
connector( the widest one) leave the center plug in and the smaller
black plug in.
6.Turn off car leave Tech 2 plugged in.
7.Remove remaining plugs from module in the rear of car.
8.Turn car on to verify the " Max speed 80 mph" is gone.
9.Unplug Tech 2 and put tools away.
Then you have to follow the bouncing ball of checking off RPO Codes. When you get to F55 set it to disabled.
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