Past Repair Claims are CLOSED — But Future Coverage is ACTIVE
If you owned a 2011-2016 Duramax diesel Chevrolet Silverado or GMC Sierra, the deadline to file claims for past CP4 pump repairs or former owner compensation passed on November 6, 2025.
However, if you currently own an eligible vehicle and experience a CP4 pump failure on or after May 6, 2025, you are entitled to 50% reimbursement for qualifying repairs until May 6, 2026, or 200,000 miles—whichever comes first.
The Lawsuit and Settlement — What Happened?
Case Background
The class action lawsuit, formally titled Chapman v. General Motors LLC (Case No. 2:19-cv-12333-TGB-DRG) , was filed in the U.S. District Court for the Eastern District of Michigan. Plaintiffs alleged that Bosch CP4 high-pressure fuel pumps installed in 2011-2016 GM Duramax diesel vehicles were defectively designed and prone to catastrophic failure.
GM denied all allegations of wrongdoing but agreed to a $50 million settlement to avoid the cost and uncertainty of continued litigation. The settlement received final approval on May 6, 2025.
Settlement Amount Clarification: Early news reports from 2024 cited a proposed $35 million settlement. The final court-approved settlement amount is $50 million. Any content referencing $35 million is outdated.
The Defect — Why the CP4 Pump Fails
The Root Cause: Fuel Lubricity
The Bosch CP4 pump was originally designed for European diesel fuel standards, which have higher natural lubricity than American Ultra-Low Sulfur Diesel (ULSD) . The lawsuit alleged that U.S. fuel does not provide adequate lubrication for the CP4’s internal components, causing the pump to essentially “run dry.”
What Happens When It Fails?
Unlike gradual mechanical wear, CP4 failure is almost always catastrophic and sudden. When the pump fails internally, it sheds metal shavings and particulate debris that are immediately circulated through the entire high-pressure fuel system.
This contamination requires replacement of nearly the entire fuel system:
| Component | Typical Replacement |
|---|---|
| High-Pressure Fuel Pump (CP4) | Required |
| Fuel Injectors | All 8 required |
| Fuel Rails (Left and Right) | Required |
| High-Pressure Fuel Lines | Required |
| Low-Pressure Fuel Lines | Cleaning or replacement |
| Fuel Tank | Cleaning or replacement |
| Fuel Filters | Required |
Total repair cost: $7,000 – $15,000+
Real Owner Account: A Life-Threatening Failure
One 2014 GMC Sierra 2500HD owner described the sudden failure while towing a camper with family on a two-lane Arkansas highway:
“The vehicle gave me no prior warning, dash board suddenly read power restricted followed immediately with complete power loss as I reached to top of hill. I was forced to steer and brake the truck and camper with no power, down the hill to prevent vehicles from passing at crest of hill. This left me and my family and numerous other drivers in a very dangerous situation… GM is aware of this issue that cost me $10,336 at GM dealership where repaired.”
This account, submitted as a consumer complaint, illustrates precisely why this settlement matters—and why the 50% future repair coverage remains critically important for current owners.
Eligible Vehicles and Owners
Vehicles Covered
| Make | Models | Model Years |
|---|---|---|
| Chevrolet | Silverado 2500 HD, Silverado 3500 HD | 2011, 2012, 2013, 2014, 2015, 2016 |
| GMC | Sierra 2500 HD, Sierra 3500 HD | 2011, 2012, 2013, 2014, 2015, 2016 |
| Chevrolet | Avalanche 1500, Suburban, Tahoe | 2011-2016 (with Duramax LML) |
| GMC | Yukon XL, Yukon | 2011-2016 (with Duramax LML) |
Engine Requirement: Equipped with the 6.6L Duramax turbo-diesel V8 engine (RPO Code LML) .
Geographic Restriction — IMPORTANT
This settlement applies ONLY to vehicles purchased from a GM-authorized dealership located in these seven states:
| Region | States |
|---|---|
| West | California |
| Midwest | Illinois, Iowa |
| Northeast | New York, Pennsylvania |
| South | Florida, Texas |
Purchase Location Rule: Eligibility is determined by where you purchased the vehicle from the dealer, NOT where you currently live or where the vehicle is registered.
This geographic limitation has been a major source of confusion and criticism. Owners who purchased eligible trucks in the other 43 states are NOT covered by this settlement, even if they now reside in an eligible state.
Purchase Date Eligibility
- Vehicles purchased new or used from a GM-authorized dealer
- Purchase date must be between March 1, 2010, and September 13, 2024
Compensation Breakdown — What You Can Still Get
PAST REPAIR REIMBURSEMENT — DEADLINE PASSED (November 6, 2025)
Status: CLOSED. Owners who paid out-of-pocket for CP4 pump repairs before May 6, 2025, were eligible for $6,356 – $12,712 reimbursement. This claim window has now closed.
FORMER OWNER COMPENSATION — DEADLINE PASSED (November 6, 2025)
Status: CLOSED. Individuals who owned an eligible vehicle, sold it before May 6, 2025, and did not pay for repairs were eligible for $400 – $800 cash payments. This claim window has now closed.
FUTURE REPAIR COVERAGE — ACTIVE (Until May 6, 2026 or 200,000 miles)
This is the only remaining active benefit for current owners.
If your eligible vehicle experiences a qualifying CP4 pump failure on or after May 6, 2025, you are entitled to:
| Coverage Type | Details |
|---|---|
| Reimbursement Rate | 50% of eligible repair costs (parts and labor) |
| Coverage Period | Until May 6, 2026 OR vehicle reaches 200,000 miles (original in-service date) — whichever comes first |
| Where to Repair | Any GM-authorized dealership OR independent repair facility |
| GM Dealer Repairs | Reimbursement processed via claim submission; dealership may offer direct billing options |
| Independent Shop Repairs | Eligible for 50% reimbursement; must submit claim with itemized invoice |
| Claim Submission Deadline | Within 60 days of repair date (dealership repairs strongly recommended to avoid delays) |
Important: Future repair coverage applies only to the specific CP4 pump failure and resulting fuel system contamination. Routine maintenance or failures unrelated to the CP4 pump are not covered.
How to File a Future Repair Reimbursement Claim (Step-by-Step)
If your vehicle suffers a CP4 pump failure today, follow this exact process:
Step 1: Verify Your Vehicle is Eligible
Use the official VIN Lookup Tool at www.gmduellitigation.com to confirm your truck is included in the settlement class.
Step 2: Choose Your Repair Facility
- Strongly recommended: GM-authorized dealership. They are familiar with the settlement process and can assist with direct billing or proper claim documentation.
- Alternative: Independent diesel repair shop. You will be responsible for submitting the claim yourself.
Step 3: Ensure Proper Documentation — THIS IS CRITICAL
Your repair invoice MUST clearly include:
Vehicle Identification Number (VIN) – 17 digits, clearly printed
Exact mileage at time of repair
Itemized list of all replaced parts – Must specifically state:
- “Fuel injection pump” or “CP4 pump”
- “Fuel injectors” (quantity: 8)
- “Fuel rails” (driver and passenger)
- “High-pressure fuel lines”
- “Fuel system flush” or “tank cleaning/replacement”
“Fuel system repair” (generic) is NOT sufficient and will result in claim denial.
Proof of payment – Credit card statement, bank statement, or canceled check showing the exact amount paid to the repair facility. Cash receipts alone may be rejected.
Step 4: Submit Your Claim
Official Settlement Administrator: JND Legal Administration
Website: www.gmduellitigation.com
Phone: 866-848-0815
Mail: GM Fuel Pump Settlement, c/o JND Legal Administration, PO Box 91445, Seattle, WA 98111
Deadline: Submit your claim within 60 days of the repair date.
Symptoms of CP4 Pump Failure — Know the Warning Signs
If you own an eligible Duramax, immediate recognition of these symptoms can prevent you from being stranded—or worse.
| Symptom | Description |
|---|---|
| Sudden Loss of Power | Engine dramatically loses power while driving; may be accompanied by knocking or shaking |
| Engine No-Start | Engine cranks normally but will not start—common after catastrophic pump failure |
| Rough Idle | Engine idles erratically, shakes, or misfires |
| Excessive Engine Noise | Loud knocking or clattering from engine bay, distinct from normal diesel operation |
| Check Engine Light | Fuel pressure-related DTCs: P0087, P0088, P0093, P0191, P062B, P1093 |
| Reduced Fuel Economy | Noticeable drop in MPG without other explanation |
If you experience these symptoms, do not continue driving. Further operation will circulate more metal debris and increase repair costs.
Frequently Asked Questions
Q1: I missed the November 6, 2025 deadline. Can I still get reimbursed for my past CP4 repair?
No. The deadline for past repair reimbursement and former owner compensation has passed. Claims submitted after November 6, 2025, have been automatically denied.
Q2: My truck is still covered under the 50% future repair program. How long do I have?
Until May 6, 2026, OR 200,000 miles on the odometer—whichever comes first. After that date or mileage, the settlement coverage expires.
Q3: I live in Texas, but I bought my truck from a dealer in Oklahoma. Am I eligible?
No. Eligibility is determined strictly by the state where the vehicle was purchased from the GM-authorized dealer. If you bought it outside the seven covered states, you are not part of this settlement.
Q4: I am the original owner, but my truck now has 210,000 miles. Am I covered for a future failure?
No. The 50% future repair coverage ends at 200,000 miles (original in-service date). Repairs after exceeding that mileage are not reimbursable under this settlement.
Q5: Can I get a proactive CP4 replacement covered under the settlement?
No. The settlement only covers repairs for actual pump failures, not preventive replacements. However, GM is required to make available a reduced-price CP4 replacement kit for owners who wish to proactively replace the pump. Contact your GM dealer for pricing and availability.
Q6: I had my CP4 pump replaced with a CP3 conversion kit. Am I eligible for reimbursement?
Probably not. The settlement is specifically for CP4 pump failures and repairs using GM-specification parts. CP3 conversions are aftermarket modifications and are not covered. Consult the settlement administrator for specific case review.
Q7: My claim for past repairs was denied because my invoice said “fuel system repair.” Can I appeal?
Possibly. If you have additional documentation—itemized parts lists, original work orders, or mechanic affidavits—you may contact the settlement administrator to request reconsideration. However, the claim deadline has passed, so success is not guaranteed.
Q8: What is the official settlement website?
www.gmduellitigation.com. Do not rely on third-party sites for claim forms or deadlines.
Beyond the Settlement — Options for Current Owners
If You Own an Eligible Truck and Are Within the Coverage Window (Under 200k miles, before May 2026)
You are protected at 50% reimbursement for a qualifying CP4 failure.
Keep your documentation ready. Save this article, bookmark the settlement website, and ensure any future repair invoices are itemized correctly.
Consider proactive monitoring. If you experience any symptoms listed in Part VI, address them immediately—delaying repair risks higher cost and denial of coverage if failure occurs after May 2026.
If You Own an Eligible Truck but Are Outside the Coverage Window (Over 200k miles OR after May 2026)
You have NO coverage under this settlement.
You have three options:
- Risk it. Continue driving and pay 100% of repair costs if the pump fails. ($8,000–$15,000)
- Proactively replace the CP4. Purchase the reduced-price CP4 kit from GM and have it installed at your expense. (Cost: Several thousand dollars, but less than a full post-failure repair.)
- CP3 conversion. Many diesel specialists recommend replacing the CP4 with a CP3 pump—a more robust design that is not prone to this failure mode. This is an aftermarket modification, not covered by GM, and costs approximately $3,000–$5,000 installed.
If You Are Considering Buying a Used 2011-2016 Duramax
Proceed with extreme caution.
- Verify if the vehicle is originally from one of the seven covered states. If not, there is no settlement coverage for future failures.
- Check if the CP4 pump has already failed and been replaced. Request repair records.
- Factor the cost of a proactive CP3 conversion into your purchase decision.
Why This Settlement Matters — And What GM Didn’t Admit
GM denied all allegations that the CP4 pump was defective or that the company acted improperly. The settlement is not an admission of liability.
Yet the evidence is overwhelming:
- Thousands of owners experienced identical, catastrophic failures.
- The CP4 pump was redesigned for later models, and both Ford and Ram/Cummins have issued recalls or service campaigns addressing CP4 failures in their diesel trucks.
- Ram/Cummins implemented the solution that many Duramax owners wish GM had adopted: replacing the CP4 with the proven CP3 pump.
The $50 million settlement compensates a fraction of affected owners, in only seven states, for a fraction of their actual losses. For many, this settlement is better than nothing—but far from full justice.
Final Checklist — What to Do Right Now
| Action | Status | Deadline |
|---|---|---|
| Verify your vehicle’s eligibility | ✅ DO THIS NOW | Ongoing |
| Check your original purchase state | ✅ DO THIS NOW | Eligibility fixed |
| If you already had a CP4 failure and missed the deadline | ❌ No recourse | Past |
| If you have an eligible truck under 200k miles | ✅ You have 50% coverage | Until May 6, 2026 |
| Save the settlement website | ✅ www.gmduellitigation.com | Bookmark it |
| Save the administrator phone number | ✅ 866-848-0815 | Bookmark it |
| If you experience CP4 failure symptoms | ✅ Seek immediate repair | Within 60 days of repair |
Conclusion: Act Now While Coverage Remains
The GM CP4 fuel pump class action settlement is largely closed, with reimbursement for past repairs ending on November 6, 2025. The only remaining benefit is a limited 50% reimbursement for qualifying pump failures on certain 2011–2016 Duramax trucks purchased in select states, valid until May 6, 2026, and under 200,000 miles. If you qualify, act immediately. Missing the deadline or mileage limit could leave you responsible for the full $8,000–$15,000 repair cost.