Only the automaker knows why.
General Motors relies heavily on sales of its popular Chevrolet Silverado and GMC Sierra lineups. The ongoing semiconductor chip crisis is a painful lesson that's hurting the American automaker's bottom line. But truck (and SUV) production must go on. Unfortunately, there's a mysterious problem with the Chevy Silverado HD and its more premium counterpart, the GMC Sierra HD.
GM Authority has learned GM issued a stop-sale order for unsold 2021 model year trucks. The 2022 model year, of which production got underway in July, remains unaffected. All of the 2021 trucks were built at the GM Flint Assembly plant in Michigan.
The problem apparently stems from an unknown quality issue that GM refuses to specifically state. A company spokesperson did acknowledge that the automaker "has notified Chevrolet and GMC dealerships to stop the delivery of certain 2021 [Silverado HD and Sierra HD truck]. We are investigating a potential quality issue with these vehicles. We have no additional information to share at this time."
However, a GMC dealership employee claims they know the reason why: a wire chafing problem that could be a fire hazard. Again, this is unconfirmed so until GM does so otherwise it remains pure speculation. We don't think owners should be alarmed at this time. The situation isn't a good one for dealerships.
These trucks have always been in high demand and they're more so than ever these days. Dealers now find themselves in a situation where they can't sell 2021 models still parked on their lots. Customers can come and look, perhaps place a deposit, but not finalize the purchase. GM could not provide a time frame as to when a solution will be found. There's also the possibility this could lead to a recall for 2021 model year vehicles that have already been sold.
But the good news is only certain 2021 vehicles are involved, so this does not appear to be anywhere near close to the scale of the Chevy Bolt fire recall debacle. We'll update this story once relevant information becomes available.