A recent post on the GM Techlink service website provides a solution to the front-end rattle or clunking sound that some 2019 to 2023 model-year Chevy Blazer owners have reported.
According to the post, a “rattle or clunk sound may be heard at the front of the vehicle on some” 2019-2023 model-year Chevy Blazer models. The post indicates this problem may be related to a more common problem, such as a loose strut or sway bar, however the sound may also be the result of “a loose, mispositioned or improperly torqued cradle brace,” the automaker says. The cradle brace is a flat bar that is bolted across the center of the engine cradle (labeled #1 in the diagram below).
GM says certified technicians will be able determine if the rattle or clunk sound is coming from the cradle brace, as opposed to a loose suspension component, by removing the cradle brace and driving the vehicle for a short period while driving over small bumps or executing turning maneuvers. If the sound is no longer heard, it’s likely it was related to a loose or misaligned cradle brace.
To fix this problem, GM technicians will be instructed to re-install the cradle brace and ensure the bolts are torqued to spec. GM also notes the fasteners used on the cradle brace at single-use torque-to-yield fasteners, so employees must use new fasteners when tightening the brace back down to ensure it does not come loose again.