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Apexodus

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  • Name
    Brian
  • Location
    Hattiesburg, MS
  • Gender
    Male
  • Drives
    2014 GMC Sierra SLE/Z71 Crew Cab

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  1. I took mine to the dealer for the same issue...popping or thunking noise under the bed of the truck when its cold or at slower speeds. They did a ECM and BCM recalibration that affected the transmission. They said this was a recall for the 2014 (GMC). After this recalibration, I have heard the noise much less though it is still there occasionally. It leads me to think that it is a transmission issue.
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