The GM CP4 pump class action lawsuit has become a significant legal case that affects many diesel truck owners, especially the Chevrolet Silverado and GMC Sierra models with the 6.6L Duramax engine from 2011 to 2016. The faulty Bosch CP4 gasoline pumps that were fitted in these trucks are the subject of this action. The plaintiffs claim that these pumps lead to significant engine failures because of contamination and inadequate fuel supply. Let’s examine this case, the ramifications for truck owners who are impacted, and the class action procedure.
What Is the GM CP4 Pump Class Action Lawsuit?
The gm cp4 pump class action lawsuit, filed in 2019, addresses the issue of defective Bosch CP4 high-pressure fuel pumps that were installed in specific GM diesel trucks. The high failure rate of these pumps, which are intended to force fuel through the engine at high pressures, has drawn criticism. The CP4 pump’s incompatibility with American diesel fuel, namely the fuel’s decreased lubricity, is the main accusation. This can result in quick wear, debris buildup, and, frequently, catastrophic engine failure.
The plaintiffs contend that GM did not sufficiently alert customers to the dangers posed by the CP4 gasoline pump. Owners of impacted vehicles have consequently had to pay for expensive repairs, such as engine overhauls or even complete engine replacements. The purpose of this class action is to compensate individuals impacted by the faulty pumps present in specific GM diesel trucks manufactured between 2011 and 2016.
Affected Vehicles
The GM CP4 pump class action lawsuit pertains to specific vehicles equipped with the 6.6L Duramax engine. The 2011–2016 GMC Sierra 2500HD and 3500HD and the 2011–2016 Chevrolet Silverado 2500HD and 3500HD are the main models in this group. Owners of diesel trucks that had engine problems as a result of the CP4 fuel pump in their vehicles might be entitled to reimbursement.
These trucks must have been bought or leased from an authorized GM dealer and have had problems with the faulty CP4 pump in order to be covered by the lawsuit or settlement.
Why Is the GM CP4 Fuel Pump Defective?
The GM CP4 pump class action lawsuit has been considered a critical issue due to its design and compatibility with U.S. diesel fuel. In contrast to the higher-quality diesel fuel used in Europe, diesel fuel in the United States is less lubricating. Because diesel fuel was more lubricating in Europe, where the Bosch CP4 pump was first intended for use, the pump operated more effectively. But American fuel doesn’t have the qualities needed to maintain the CP4 pump’s smooth operation over time.
Important parts like the injectors, fuel lines, and engine itself may sustain damage if the CP4 pump malfunctions and sends metal debris into the fuel system. For car owners, this results in expensive repairs since they have to replace not just the pump but also other engine components that were harmed by the debris.
Settlement Details of the GM CP4 Pump Class Action Lawsuit
In May 2025, a $50 million settlement was approved to resolve the claims brought forth by the GM CP4 pump class action lawsuit. This settlement aims to provide financial compensation to vehicle owners who were affected by the defective pumps.
Reimbursement for Past Repairs
The settlement offers recompense to vehicle owners who have already covered the cost of repairs associated with the CP4 pump failure. The amount of reimbursement may vary from $6,356 to $12,712 based on the extent of the repairs and the quantity of claims filed.
Compensation for Former Owners
Compensation is also available to former owners of the impacted GM trucks who chose not to pay for repairs. Depending on the conditions of the settlement and their eligibility, these people may get $400 to $800.
Partial Reimbursement for Future Repairs
Up to 50% of the cost of repairs may be partially reimbursed to current vehicle owners who may experience CP4 pump failure after May 6, 2025. GM-authorized dealerships offer this coverage, which is valid until the car has 200,000 miles on it or until May 6, 2026, whichever comes first.
How to File a Claim for the GM CP4 Pump Class Action Lawsuit
Affected truck owners who want to file a claim for compensation must visit the official settlement website: GM Fuel Pump Settlement. The process is straightforward:
- Check Eligibility: Use the VIN lookup tool to confirm if your truck is eligible for the settlement.
- Submit Required Documentation: Gather documents such as proof of ownership, repair receipts, or proof of sale for former owners.
- Complete the Claim Form: Fill out the online claim form with the necessary information, including vehicle details and repair documentation.
- Submit and Await Confirmation: Once your claim is submitted, monitor the settlement website for updates regarding your claim status.
Important Deadlines
- Claim Submission Deadline: November 6, 2025
- Exclusion and Objection Deadline: December 12, 2024
- Final Approval Hearing: January 21, 2025
Conclusion
The GM CP4 pump class action lawsuit addresses a significant issue for owners of certain GM diesel trucks, particularly those with 2011 to 2016 Chevrolet Silverado and GMC Sierra models equipped with the 6.6L Duramax engine. These vehicles were found to have defective Bosch CP4 fuel pumps, It can result in expensive repairs and serious engine damage.
Affected truck owners will get compensation from the settlement, which includes reimbursement for previous repairs, partial coverage for upcoming repairs, and compensation for previous owners. It’s crucial to act and submit a claim before the deadline if you own one of these impacted cars or have encountered problems with the CP4 gasoline pump.
This class action lawsuit is an important way for everyone affected by the GM CP4 pump problem to get the justice and compensation they are due. Don’t pass up the chance to fix this problem and get reimbursed for some of the costs incurred due to the malfunctioning fuel pumps, if you qualify.
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