If you’ve been following the rear wheel lock-up recall story we covered earlier, GM has just added another big piece of news that should catch your attention. Owners of the affected 2020–2022 Chevy, GMC, and Cadillac diesel trucks and SUVs are now getting some major warranty backup through a Special Coverage Program. Whether you’re an owner, plan to be one, or just like staying in the know, here’s everything about this update and what it means for you.

Extended Coverage for Affected Vehicles

We already detailed the models hit by the recall in our previous article, and this Special Coverage extends directly to those same trucks and SUVs. If you missed it, here’s a quick refresher:

Now, GM is offering 15 years or 150,000 miles (240,000 km) of warranty coverage from the original service date, no matter how many owners the truck has had. That’s a huge relief for anyone worried about the costs of repairs from this defect down the road.

What’s the Problem Again?

Just like we explained in the recall breakdown, the issue comes from excessive wear on the transmission control valve, which can lead to a drop in fluid pressure. The symptoms include:

  • Harsh shifting
  • Reduced engine performance
  • Diagnostic Trouble Code P0747
  • Momentary rear wheel lock-up when downshifting in eighth gear

While rare, the lock-up could be risky, especially at higher speeds. This warranty means GM is doubling down on ensuring owners are protected.

What’s Covered?

This Special Coverage takes care of:

  • Replacing the transmission control valve body
  • Software updates to prevent wear and monitor performance
  • All labor and diagnostics tied to the problem

The best part? It’s all free. However, if your issue doesn’t align with this specific issue, the repairs aren’t covered under the program.

Blue 2021 Chevrolet Silverado 1500 Z71 Diesel parked on snow with forest and mountain ski slopes in the background.
A Chevrolet Silverado 1500 Z71 Diesel parked in snowy terrain with a scenic mountain backdrop—part of GM’s rear wheel lock-up warranty program.

Already Paid for Repairs? Here’s How to Get Reimbursed

If you had to fix this issue before GM rolled out the program, they’ve got your back. You can request reimbursement for qualifying repairs if they happened before November 26, 2024, and you get your claim submitted by December 31, 2025.

Here’s what you’ll need:

  • Fill out the reimbursement form included in GM’s letter.
  • Submit it with your repair receipts and other documents to your dealer or GM’s Reimbursement Department.
  • For more details on what’s eligible, check your paperwork carefully.

What You Need to Do Now

  • Check if Your Vehicle Qualifies: Use GM’s Investigate Vehicle History (IVH) system or plug your VIN into their Owner Center or the NHTSA website.
  • Plan Repairs if Needed: Schedule service with your GM dealer if you’re noticing symptoms. Keep in mind that parts are in short supply, so plan ahead.
  • Hold Onto Documentation: Keep records of everything related to repairs or diagnostics—this will make filing a reimbursement claim much smoother.

Dealers and Inventory on Hold

For those looking to pick up one of these trucks, be aware that dealers are under a stop-sale order for any new or used units until the required fixes are complete.

Customer Support Contact Info

If you’ve got questions or want to schedule a service, GM’s customer assistance lines are open:

Why This Matters

If you’re driving one of these rigs or looking to buy one, this expanded warranty should provide peace of mind. GM’s move here feels like a win for owners, giving them long-term coverage for a defect that could’ve been a major headache. For more background on how this all started, make sure to check out our deep dive into the original recall, and stay tuned for more updates as this story unfolds.