Some metal inside or under the b pillar is expanding and tapping. I think it is a combo of heat and humidity because we have had days here in SC where the temp is well into the 90s and I don't hear it, yet 70-80 degrees on a damp morning and the sob is rattling like there's no tomorrow.
Has anyone with running boards successfully fixed this by re-torquing the bolts? I'm considering putting running boards on if it'll fix the problem. At this point, it might be cheaper than constantly taking off of work to go to the dealer only to hear that they can't replicate it.
I’ve spent more time than I’d like to admit under my truck with my wife working the door, jumping on the door sill, etc, and @wreckdiver I’m most certain you are correct. There are areas under the truck where the sheet metal is stamped together at an angle - with the obvious one being right under the b pillar. That is clearly where the noise is coming from. Maybe a set screw will hold it into place? I have an appointment next week but I’m skeptical that they’ll make progress given everyone else’s issues. I’m bound and determined to solve this.
I’m becoming more convinced that this noise is coming from metal either under the truck or under the metal near the door sills. Normally the noise radiates through the b pillar, but this morning it was most evident under the driver’s door speaker. @drtyTshrt @sierra1412 have yall received any updates? Has anyone with running boards been able to permanently fix this?
GM released a TSB for the Colorado and Canyon #PIT5632 but hasn't provided a fix yet. If you go read some of the Colorado forums, they're having the identical issue. Apparently the TSB was opened in September of 18 and reads: "Engineering is investigating this concern. The root cause has been determined and best path to repair is being evaluated. Attempt no repair at this time. DO NOT put expanding foam in the pillar, this will not repair the concern and will make the eventual repair more difficult. This PI will be updated when the repair procedure has been established." If anyone can provide additional info beyond what's on gm-trucks about this issue, I'd really appreciate it. I love my truck but this constant rattling in the b pillars is awful. Bob - I've had the dealer take my b pillars off and remove the black rubber around the wiring harness. You can see a small gap between the two layers of sheet metal but you can't get anything down in there to see what might be touching. I don't believe you'll be able to accomplish anything by taking the panel off and disconnecting the wiring harness.
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