If you own one of the affected vehicles in GM’s latest recall, the advice from the automaker is pretty daming: park it and don’t move it until a dealer has looked at it.An NHTSA campaign covers a total of 66 vehicles across several Chevrolet, GMC, and Cadillac nameplates and the scope spans two distinct groups:Certain 2026 model-year Chevrolet Silverado 1500, Tahoe, and Suburban vehicles equipped with four-wheel drive or all-wheel drive, along with select 2015 through 2020 full-size SUVs that may have received a replacement transfer case.AdvertisementAdvertisementOn the 2026 side, that includes the Cadillac Escalade and Escalade ESV, and the GMC Sierra 1500, Yukon, and Yukon XL.A Missing Part in the Drivetrain, Not a Software GlitchThis one traces back to the hardware, specifically to a transfer case that left the supplier line incomplete.GM has identified that a missing oil pickup tube inside the transfer case may prevent proper lubrication of internal bearings, and over time, that condition could cause the transfer case to fail and lead to sudden wheel lock-up.GM became aware of the problem on April 14, 2026, following a report through the Speak Up For Safety program, after an engineer performed a teardown on a transfer case from a 2026 Silverado 1500 that had experienced a lock-up event in a parking lot.AdvertisementAdvertisementThe teardown revealed the missing oil pick-up tube, and using available end-of-line test torque data, the supplier identified suspect transfer case assemblies – no fewer than 68, spread across 54 dealers that had received the incorrectly produced units.The safety implication is straightforward and serious. Front or rear wheels locking up without warning at any speed dramatically raises the risk of a crash, and unlike a software fault, it cannot be addressed remotely.Recalled vehicles will be towed in for inspection and, if necessary, a replacement transfer case.The repair is free of charge.Rear ¾ view of the 2025 Cadillac Escalade Sport Platinum in Deep Sea Metallic with a house and greenery in the background.What Owners Need to Do Right NowGeneral Motors urges affected owners and lessees to immediately stop driving these pickup trucks and sport utility vehicles until the fix is carried out.AdvertisementAdvertisementThat instruction applies even before official notification letters arrive.Dealers have already been instructed to replace suspect assemblies, while customer notification letters are expected to follow by June 22, 2026. The involved VINs were uploaded to NHTSA’s recall website on May 7, 2026.That means you can check your vehicle right now at NHTSA.gov before the letter ever lands in your mailbox.GMC owners can call 1-800-462-8782, Chevrolet can be reached at 1-800-222-1020, and Cadillac customers can call 1-800-333-4223.Given the do-not-drive guidance, if your VIN is flagged, call ahead and arrange for the vehicle to be towed to the dealer rather than driving it in yourself.AdvertisementAdvertisementThe recall population is small at 66 vehicles, but wheels locking without warning is the kind of failure that can end badly on a highway.GM has received four complaints potentially related to the issue to date.The company acted quickly once the root cause was confirmed, and the fix – inspecting and replacing the transfer case assembly where needed – addresses the actual problem rather than masking it with a software patch. For the owners caught up in it, the inconvenience of arranging a tow is a reasonable trade for not finding out what a locked axle feels like at highway speed.