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Kirby Reynolds

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  • Name
    Kirby
  • Location
    Fort Worth
  • Drives
    2017 GMC Sierra

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  1. Anyone ever have C0277-4B and U0422-71 pop up together? I replaced the brake pedal position sensor and a buddy of mine did the relearn procedure on his snap-on Zeus. I have checked fuses and plug connections and still getting the same codes. Any ideas?
  2. Thanks. So I got a proper scan tool and the code returned shows that it’s in key relearn mode. B3031 “Key Decoder Device in Assem Learn Mode”. I have done the three ten minute procedure and can’t seem to get out of this mode. Does anyone have any ideas here?
  3. First post here, did a bit of googling and couldn’t find much on a “Service Theft Deterrent System” issue WITH a start condition. I recently bought an auction truck that was indeed stolen, then recovered. From what I can tell, since the truck has been in my possession, it seems that the ignition cylinder and key has been replaced, the driver’s lock is damaged beyond use, and the HMI control module bypass module was missing (it has since been replaced). Everything else looks untouched and and uncut. The truck complains about servicing the theft deterrent system in the center screen gauge cluster screen, but the actual orange lock icon light in the cluster has never illuminated. The truck starts fine, sometimes delayed, and drives around the block. I have unhooked the battery for up to half an hour, tried the key relearn process (three ten minute on positions) and I still get the theft decent system message. What else could I be missing here? Any help would be appreciated. Thanks.
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