GM Program May Replace Rear Drive Units on Silverado EV, Sierra EV and Other EVs

General Motors has updated a Customer Satisfaction Program covering certain Chevrolet Silverado EV, GMC Sierra EV and other electric vehicles that may have an assembly issue inside the rear electric drive transmission module.

GM program N252502891 says certain affected vehicles may have an internal differential nut that was cross threaded or missing during assembly.

Depending on the vehicle's service history, GM dealers may be required to replace the entire rear electric drive transmission module.

The program covers specific vehicles, not every vehicle within the listed model years, so dealers must verify eligibility by VIN through GM's Investigate Vehicle History system.

The program remains in effect through August 31, 2027.

What GM Says Is Wrong

GM describes the condition fairly simply.

Certain vehicles may have an internal differential nut that was cross threaded or missing during assembly.

The bulletin does not identify a specific dashboard warning, noise or other symptom that owners should wait for before having the vehicle checked.

Instead, this is a VIN based field action. GM instructs dealers to use the vehicle's record in Investigate Vehicle History, or IVH, to determine whether the program applies.

That is important because simply owning a Silverado EV, Sierra EV or one of the other models listed below does not automatically mean your vehicle needs a rear drive unit replacement.

Which EVs Are Included?

The Rear Electric Drive Transmission Module Replacement program N252502891 applies to certain vehicles within the following model years:

Again, those model years define the population from which affected VINs may come. They do not mean every vehicle produced in those model years requires the repair.

GM specifically instructs dealers to check the VIN in its Global Warranty Management system and confirm that the program is in OPEN status before beginning the repair.

How GM Determines Whether the Rear Drive Unit Needs Replacement

The repair procedure begins with a review of the vehicle's service history.

Step 1: Check the VIN in GM's IVH System

The dealer first looks up the vehicle in GM's Investigate Vehicle History system.

The technician checks whether the vehicle has already had its Rear Electric Drive Transmission Module replaced under the VIN's transaction history.

If the Module Was Already Replaced

If the rear electric drive transmission module was previously replaced, GM says no further action is required.

If the Module Has Not Been Replaced

If the vehicle has not previously had the module replaced, the dealer proceeds with replacement of the Rear Electric Drive Transmission Module.

For the Silverado EV, Sierra EV, Escalade IQ and several other models, this involves replacement of the rear electric drive transmission module using GM's prescribed service procedure.

This Is More Than a Small Component Replacement

The repair outlined for affected Silverado EV and Sierra EV vehicles is not simply replacing the differential nut itself.

GM's parts list calls for replacement of the rear electric drive transaxle module, along with associated hardware, transmission fluid and high voltage battery coolant as required.

For Silverado EV and Sierra EV repairs, the bulletin lists a warranty labor time of 6.0 hours for the Rear Electric Drive Transmission Module Replacement operation.

The actual amount of time a vehicle remains at the dealership can depend on scheduling, parts availability and dealer workflow, but GM's published labor operation indicates that this is a substantial repair rather than a quick inspection.

GM Dealers Must Hold Affected Vehicles Before Delivery

One of the more significant provisions in the program applies to vehicles still in dealer possession.

GM instructs dealers that new, used, GM Certified Pre-Owned, courtesy transportation, dealer shuttle, CarBravo and other affected vehicles in their possession must be inspected and repaired before customers take delivery.

GM says involved vehicles must not be:

• Delivered to customers
• Dealer traded
• Released to auction
• Used for demonstration
• Released for another purpose before the required correction is completed

Affected GM Certified Pre-Owned vehicles are also to be temporarily de-certified until the repair has been completed and an accepted warranty transaction has been submitted.

That means a dealer with an affected Silverado EV, Sierra EV or other covered vehicle in inventory is not supposed to simply sell or release it without addressing the field action first.

How Much Will the Repair Cost Owners?

For vehicles covered by this Customer Satisfaction Program, GM says the required service will be performed at no charge to the customer.

The dealer responsibility section says vehicles subject to the program are to be serviced at no charge regardless of mileage, vehicle age or ownership through the program's expiration date.

GM's customer letter states that the free service is available through August 31, 2027.

After that date, any applicable vehicle warranty would determine coverage.

Will GM Contact Owners?

Yes.

GM says it will notify affected customers in the United States and Canada.

The bulletin includes a sample customer letter explaining that the owner's vehicle may have the internal differential nut condition and that the dealer will review the vehicle's service history and replace the rear electric drive transmission module if necessary.

GM recommends contacting the dealer as soon as possible to schedule an appointment.

The company also advises customers to confirm that the servicing location is an EV certified dealer.

GM says repairs outlined in the program must be completed by an authorized EV dealer and performed by a technician who has completed the applicable technical training.

Is This a Recall?

GM identifies N252502891 as a Customer Satisfaction Program.

The document is structured as a GM field action and directs dealers to verify individual VIN eligibility through the company's warranty management system.

That makes checking the specific VIN important. The model and model year alone are not enough to determine whether a particular vehicle is included.

Owners who believe their vehicle may be affected can contact an EV certified GM dealer and ask the dealer to check the VIN for Customer Satisfaction Program N252502891.

What Should Owners Do?

If you own one of the model years listed in this program, there is no need to assume that your vehicle automatically requires a new rear drive unit.

The important step is to determine whether your specific VIN is included.

You can contact an EV certified Chevrolet, GMC or Cadillac dealer and ask them to check your VIN for Customer Satisfaction Program N252502891.

If the program is open on your VIN, GM recommends scheduling the repair as soon as possible so the dealer can ensure the required parts are available for your appointment.

Owners do not need to wait for a warning light or other symptom before checking eligibility. The program is based on the vehicle's VIN and service history.

EV Outdoors Takeaway

The biggest takeaway from N252502891 is that this is not simply a software update or quick inspection.

GM says certain vehicles may have an internal differential nut that was cross threaded or missing during assembly. If an affected vehicle has not already had its rear electric drive transmission module replaced, GM's procedure calls for replacement of that module.

For Silverado EV and Sierra EV owners, the most important point is that only certain VINs are involved.

If you own a 2024 Chevrolet Silverado EV or 2025 GMC Sierra EV, it is worth asking an EV certified dealer to check your VIN for Customer Satisfaction Program N252502891.

If your vehicle is included, GM says the repair will be performed at no charge through August 31, 2027.

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Sources and Methodology

General Motors: Customer Satisfaction Program N252502891, "Rear Electric Drive Transmission Module Replacement," August 2026, Update 01. View the official NHTSA communication .

GM says the program applies only to certain VINs within the listed model years. Dealers are instructed to verify vehicle involvement through Investigate Vehicle History in GM Global Warranty Management before performing repairs.

The August 2026 update revised portions of the parts information and service procedure. This article is based on the updated version of N252502891 included with GM dealer communication DCS7560 dated August 20, 2026.