Recall 26V129 covers 11,807 2025-2026 Chevrolet Silverado 3500 and GMC Sierra 3500 trucks for fuel-transfer failure. Dealer or OTA ECM update is free.
Chevrolet is recalling 11,807 2025-2026 Silverado 3500 and Sierra 3500 trucks with gasoline engines and dual fuel tanks because the rear fuel pump can fail to move enough fuel to the front tank. The engine can stall while driving, which increases crash risk, and the dealer repair is free.
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What's wrong?
The engine control module on these 2025-2026 Silverado 3500 and Sierra 3500 trucks is the computer file that tells the gasoline engine and fuel system how to operate. On trucks with dual fuel tanks, the rear tank must transfer fuel to the front tank so the engine has usable fuel while driving.
The problem is an incorrect software calibration. During a normal transfer from the secondary tank to the primary tank, the software sets fault codes in error. Once those codes are set, the truck stops further fuel transfers until the vehicle is turned off and restarted. The fuel gauge still shows the combined fuel in both tanks, so the driver sees fuel that the engine cannot use during that drive cycle.
An owner can notice the fuel gauge change. It briefly shows the correct usable fuel amount, then after 5 seconds returns to the total fuel in both tanks. If the front tank runs low while transfer is disabled, the engine can stall.
Who's affected?
Covers the Silverado 3500 and Sierra 3500 from the 2025 and 2026 model years, all tied to the same ECM software calibration file for the fuel system.
| 2025 Chevrolet Silverado 3500 | fuel system |
|---|---|
| 2026 Chevrolet Silverado 3500 | fuel system |
| 2025 GMC Sierra 3500 | fuel system |
| 2026 GMC Sierra 3500 | fuel system |
| Units affected | 11,807 |
| Field incidents | NHTSA has logged no field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether your specific pickup truck is included.
What's the safety risk?
The warning sign is a fuel gauge that briefly shows usable fuel, then after 5 seconds returns to counting both tanks even though the secondary tank is unavailable during that key cycle. That false reading can lead to an engine stall and increase crash risk. Repair is free at any franchised Chevrolet dealer.
What should I do?
- Check your VIN to confirm your 2025-2026 Chevrolet Silverado 3500 or GMC Sierra 3500 is included in this recall.
- Contact a franchised Chevrolet or GMC dealer to schedule the free ECM software update that corrects rear-fuel-pump transfer control and addresses the engine-stall risk.
- Ask whether your truck can receive the software repair through an over-the-air update or needs a dealer visit.
- Bring the owner letter if you have it. If not, reference recall number 26V129 when you call.
- Avoid driving on low fuel until the update is complete, since the rear fuel pump transfer problem can stall the engine.
What happens at the repair
At the dealer, a Chevrolet technician updates the engine control module software. The same ECM software update can also arrive through an over-the-air update when the vehicle receives it. The update is free under the recall. It addresses rear fuel pump transfer logic so the front tank keeps receiving fuel from the rear tank. Out-of-pocket repairs already paid are handled through the existing warranty, not through a separate reimbursement program, because all included vehicles are under warranty. Ask the service desk how warranty coverage applies if you have prior repair paperwork.
| Reimbursement | Warranty coverage applies |
|---|
Timeline
| March 5, 2026 | NHTSA published the recall |
|---|---|
| March 5, 2026 | Dealer notification began |
| March 5, 2026 | Dealer notification ended |
| March 5, 2026 | VIN-searchable in NHTSA's database — Check your VIN to see whether this recall applies to your specific vehicle. |
| April 8, 2026 | Owner notification mailed |
Frequently asked questions
What is recall 26V129?
Recall 26V129 covers 11,807 2025-2026 Chevrolet Silverado 3500 and GMC Sierra 3500 vehicles with gasoline engines and dual fuel tanks. The rear fuel pump can fail to transfer enough fuel to the front tank, causing an engine stall and increasing crash risk.
What should I do if my 2025-2026 Chevrolet Silverado 3500 or GMC Sierra 3500 is on this recall?
Check your VIN to confirm your specific truck is included in recall 26V129. If it is, contact a franchised dealer to schedule the engine control module update, or ask whether the over-the-air update applies to your truck. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires manufacturers to fix recall defects at no cost, and GM will update the engine control module for free through a dealer or an over-the-air update.
Is it safe to drive with recall 26V129 open?
Recall 26V129 does not carry a do-not-drive order. The safety risk is an engine stall, which increases crash risk. Check your VIN and arrange the free engine control module update promptly if your truck is included.
When were owners notified about this recall?
GM mailed owner notification letters on April 8, 2026. VINs became searchable for this recall on March 5, 2026. If you bought the truck used or never received a letter, check your VIN and reference recall 26V129 when you call the dealer.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/26V129000 |
|---|---|
| Chevrolet customer service | 1-800-462-8782 |
| NHTSA recall # | 26V129 |
| NHTSA recall # (full) | 26V129000 |
Source documents
-
Download Owner Notification Letter (PDF) - Download Owner Notice (PDF)
- Download Recall Investigation Document (PDF) (PDF)
- Download Misc. Document (PDF)
- Download Recall Acknowledgement (PDF)
- Download Recall Report (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 19, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →