GMC Fuel Pump Lawsuit: What Owners of 2011–2016 Duramax Diesel Trucks Need to Know

You may be entitled to a cash payment of up to $12,712 if you owned a 2011–2016 Chevrolet Silverado or GMC Sierra with a 6.6L Duramax diesel engine and paid out of pocket for a CP4 fuel pump repair. A $50 million class action settlement has been reached in the case Chapman v. General Motors LLC, covering truck owners in seven states. The deadline to file a claim for past repairs has already passed, but a partial reimbursement program for future repairs runs through May 6, 2026. Here is everything you need to know about the lawsuit, who qualifies, how much you can get, and what steps to take next.

The Lawsuit and the Settlement at a Glance

The lawsuit, filed in 2019, alleged that GM equipped certain diesel trucks with a defective Bosch CP4 high-pressure fuel pump. The pump was claimed to be "unreasonably fragile and susceptible to catastrophic failure," generating metal shavings that contaminate the entire fuel injection system and can lead to engine shutdown. GM denied any wrongdoing but agreed to a $50 million settlement to avoid further litigation. On May 6, 2025, a federal judge granted final approval to the settlement. Of the total fund, up to $15 million goes to attorneys' fees and expenses, leaving $35 million for direct benefits to class members.

The settlement covers two distinct pools of money:

• $30 million Repair Fund — for owners who paid out of pocket for CP4 fuel pump repairs that were not covered by warranty.
• $5 million Former Owner Fund — for people who no longer own their truck and did not pay for a CP4 repair.

In addition, GM agreed to a partial reimbursement program for future repairs performed at GM-authorized dealerships.

Who Is Eligible for Settlement Benefits

To be a class member, you must meet all of the following criteria:

1. You purchased a model year 2011–2016 Chevrolet Silverado or GMC Sierra equipped with a 6.6L Duramax diesel engine and a Bosch CP4 high-pressure fuel pump.
2. You bought the truck from a GM-authorized dealer located in one of these seven states: California, Florida, Illinois, Iowa, New York, Pennsylvania, or Texas.
3. You purchased the vehicle between March 1, 2010, and September 13, 2024.

You can check if your specific truck is included by entering your Vehicle Identification Number (VIN) on the official settlement website at www.gmfuelpumplitigation.com.

How Much Money Can You Get?

The amount you receive depends on the type of claim you filed and how many other valid claims were submitted.

For owners who paid out of pocket for a CP4 repair (Repair Fund): Estimated payments range from $6,356 to $12,712 per repair. The final amount is based on a pro-rata share of the $30 million fund. If fewer people file valid claims, each payment goes up; if more people file, each payment goes down.

For former owners who did not pay for a repair (Former Owner Fund): Estimated payments range from $400 to $800 per person. These are also pro-rata shares of the $5 million fund.

For future repairs (Partial Repair Reimbursement Program): If you still own your truck and have a CP4 fuel pump repaired or replaced at a GM-authorized dealership on or after May 6, 2025, you can get 50% of the repair cost reimbursed. The average repair cost for a CP4 pump is around $10,000, so a 50% reimbursement could be approximately $5,000. This program runs until May 6, 2026, or until the truck reaches 200,000 miles, whichever comes first.

Key Deadlines You Need to Know

The settlement has several important dates, and some deadlines have already passed. Here is a summary:

• December 12, 2024 — Deadline to exclude yourself from the settlement or object to it. This has passed.
• January 21, 2025 — Final approval hearing date. The court granted final approval on May 6, 2025.
• November 6, 2025 — Deadline to file a claim for past repairs or as a former owner. This has passed.
• March 23, 2026 — Initial distribution payments were issued to class members with valid, timely claims.
• May 6, 2026 — The Partial Repair Reimbursement Program expires. This is a hard stop. If your pump fails on May 7, 2026, you will be entirely on your own for the repair costs.
• July 5, 2026 — Absolute deadline to submit a reimbursement request form for any qualifying repair. You must submit the form within 60 days of the repair date.

Important: The past-repair claim deadline (November 6, 2025) has passed. If you missed it, you can no longer get paid for a repair you already paid for. However, if you still own your truck, you may still be eligible for the partial reimbursement program if your pump fails before May 6, 2026.

What to Do If You Haven't Filed a Claim Yet

If you owned a qualifying truck and paid for a CP4 repair before May 6, 2025, but you missed the November 6, 2025 deadline, your options are limited. You should still contact the settlement administrator to see if any exceptions or late-filing options exist. The administrator is JND Legal Administration, and you can reach them at 1-866-848-0815 or by email at info@GMFuelPumpLitigation.com.

If you still own your truck and it has not yet reached 200,000 miles, act quickly. If your CP4 pump fails between now and May 6, 2026, take it to a GM-authorized dealership for repair. Keep all invoices and repair documentation, and submit your reimbursement request form within 60 days of the repair. The absolute final deadline to submit reimbursement requests is July 5, 2026.

What Evidence Do You Need

For any claim, you need to provide documentation proving:

• Vehicle purchase — Proof that you bought the truck from a GM-authorized dealer in one of the seven eligible states during the eligible period. This could be a purchase agreement, financing paperwork, or registration.
• Repair costs — For past repair claims, you need an invoice or repair order showing the claimant's name, VIN, and the parts and labor related to the CP4 fuel pump repair. If you don't have the original invoice, you can substitute proof of payment (such as a bank statement or credit card statement) along with a signed declaration.

For the future repair reimbursement program, keep every paper: the dealership's repair order, your receipt, and any correspondence with the dealership.

The $50 Million Settlement: What It Actually Means

The total settlement value is $50 million, but only $35 million is earmarked for direct payments to class members. The other $15 million covers attorneys' fees and litigation expenses. The $35 million is split into two pools:

• $30 million Repair Fund — This is the larger pool, designed to compensate owners who actually paid for a CP4 repair. With an estimated 2,000 to 5,000 valid claims, the per-claim payout ranges from about $6,000 to $12,700.
• $5 million Former Owner Fund — This is for people who sold their truck before the settlement and never paid for a repair. With potentially 6,000 to 12,000 valid claims, payouts range from $400 to $800.

The partial reimbursement program is not funded from the $35 million settlement fund; it is a separate obligation GM agreed to as part of the settlement.

What If You Bought Your Truck Outside the Seven States?

The class is limited to purchasers in California, Florida, Illinois, Iowa, New York, Pennsylvania, and Texas. If you bought your truck from a GM-authorized dealer in any other state, you are not included in this settlement. However, the same CP4 defect has been the subject of lawsuits against other manufacturers, including Ford, and a separate class action is pending in Canada covering a broader range of vehicles.

What About the Future: The Partial Repair Reimbursement Program

For current owners who have not yet had a CP4 failure, the Partial Repair Reimbursement Program is the most immediate benefit still available. Here is how it works:

• If you take your truck to a GM-authorized dealership for a CP4 fuel pump repair or replacement on or after May 6, 2025, GM will reimburse you for 50% of the cost.
• The program is valid until May 6, 2026, or until the truck reaches 200,000 miles, whichever comes first.
• You must submit a reimbursement request form within 60 days of the repair date. The final deadline for all reimbursement requests is July 5, 2026.
• No reimbursement is available for repairs performed at independent shops or non-GM dealerships.

If your truck is approaching 200,000 miles or if the May 6, 2026 deadline is near, consider getting your truck inspected at a GM-authorized dealership now. The CP4 pump failure can happen suddenly, and if it fails after the program ends, you will bear the full cost.

Common Questions About the GM Fuel Pump Lawsuit

Can I still file a claim for past repairs?
No. The deadline to file a claim for past repairs was November 6, 2025. That window is closed.

Can I still get money if I no longer own my truck?
The deadline to file a claim as a former owner was also November 6, 2025. That window is closed.

What if I just bought a used truck that is covered by the settlement?
If you are the current owner of a qualifying truck, you may still be eligible for the Partial Repair Reimbursement Program if the pump fails before May 6, 2026. You do not need to have been the original purchaser.

How do I check my claim status?
The settlement website does not offer a portal to check individual claim status, but you can contact JND Legal Administration by phone at 1-866-848-0815 or by email at info@GMFuelPumpLitigation.com for updates.

What if I received a Notice of Deficient Claim?
If the settlement administrator sent you a notice that your claim was deficient, you need to provide the missing documentation as soon as possible. Additional distributions have been made to class members who corrected their submissions.

The Bottom Line

The GM CP4 fuel pump class action settlement has already paid out initial distributions to eligible owners who filed timely claims for past repairs. If you missed the deadline, your only remaining option is the Partial Repair Reimbursement Program, which ends May 6, 2026. If you still own a 2011–2016 Duramax diesel truck and it has fewer than 200,000 miles, act now. Have your truck inspected at a GM-authorized dealership, and if the pump fails, keep all documentation and submit your reimbursement request within 60 days.

For more information, visit the official settlement website at www.gmfuelpumplitigation.com or call 1-866-848-0815.

Recommended Replacement: KEMSO Fuel Pump

If you need to replace your fuel pump, whether it's for a GM Duramax diesel or any other vehicle, consider a KEMSO Fuel Pump. KEMSO offers high-performance, OEM replacement fuel pumps designed to meet or exceed original equipment specifications. Every KEMSO fuel pump comes with a lifetime warranty, giving you peace of mind that your investment is protected for as long as you own the vehicle.

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Visit https://www.kemsoracing.com/ to browse their full selection of fuel pumps, check compatibility with your vehicle, and take advantage of their lifetime warranty. KEMSO is based in Houston, Texas, and ships across the United States. For customer support, email support@kemsoracing.com.