A federal judge in Michigan granted class certification on September 30, 2026 to owners of Ford 6.7-liter Power Stroke diesel trucks in five states, and the plaintiffs say a failed Bosch CP4 fuel pump can mean upwards of $9,000 in repairs. The ruling comes in Droesser et al. v. Ford Motor Company, a case filed in 2019.
Certification is a procedural step. It lets owners sue as a group, and it does not decide whether the pump is defective.
What Judge Michelson certified in Droesser v. Ford
The order came from Judge Laurie J. Michelson of the U.S. District Court for the Eastern District of Michigan, which granted in part and denied in part the plaintiffs’ motion for class certification in case number 19-12365. The classes cover California, Louisiana, Ohio, Pennsylvania and South Carolina, and the trucks at issue are 2011 through 2023 models with the 6.7-liter Power Stroke V8, according to Autoblog’s report on the ruling.
The judge also trimmed what the plaintiffs asked for. Owners whose pumps have not failed were left out of the class definition because the court found they have no present injury, the California class was limited to personal, family or household buyers, and anyone who signed a dealership arbitration agreement was excluded. The plaintiffs had sought seven state-specific classes, and the New Jersey and Indiana classes did not survive the order because of problems with the proposed representatives.
On the central question the court sided with the plaintiffs for now. It found that whether the CP4 is defective is a question common to every class member, and it concluded that Ford’s arguments about design changes across pump versions and differing fuel-contamination theories did not defeat that commonality. It also found that Ford forfeited its class-action waiver argument by raising it roughly six years into the case.
The Bosch CP4 pump and the $9,000 figure
The component at the center of the dispute is the Bosch CP4 high-pressure fuel pump. Plaintiffs allege that Ford knew the pump was unsuited to U.S. diesel and kept selling trucks with it, and that diesel sold in the United States has lower lubricity than European fuel, which they say can leave the pump short of lubrication. The metal wear that follows, they claim, sends shavings through the fuel system and into the engine.
The dollar figure belongs to the plaintiffs and the court record, not to a court finding. The certification order describes a CP4 failure as capable of catastrophic engine damage requiring a repair of about $9,000, and a separate account of the order from Pickup Truck Talk characterizes the figure as plaintiffs’ alleged repair cost of $9,000 or more, not an amount the court awarded.
Plaintiffs also claim the alleged defect reduced the value of the trucks. The court, however, noted that the overpayment damages theory had been forfeited, so the certified claims turn on owners who actually paid for a pump repair, with the cost-of-repair model found adequate for damages purposes in California.
Ford’s defense and what comes next
Ford disputes that the pump is inherently flawed. The automaker attributes failures to improper maintenance, driver error or contaminated fuel, and says design improvements across four versions of the CP4 have lowered failure rates, a claim the plaintiffs reject by arguing every version carries the same defect. In a companion summary-judgment dispute, Ford also argued that some owners skipped fuel filter changes or used abusive amounts of diesel exhaust fluid and additives, a point the judge did not treat as defeating certification on the current record.
The case is far from over. Plaintiffs’ counsel Hagens Berman Sobol Shapiro, appointed class counsel along with co-counsel firms, describes the matter on its case page as active, and no trial date has been reported. No settlement or judgment on the merits exists.
A comparison point is the same firm’s GM litigation, which ended differently. In May 2025, U.S. District Judge Terrence G. Berg gave final approval to a $50 million settlement over CP4 pumps in Duramax diesel Chevrolet Silverado and GMC Sierra HD trucks, with $30 million set aside for owners who paid out of pocket to repair a pump. Nothing comparable has been reported for Ford, and the settlement reflects a negotiated outcome rather than any ruling that the pump was defective.
Owners in the five states should treat the order as the start of a long process. Anyone who has paid for a CP4 repair on a covered truck is the kind of person the certified classes are built around, and the court’s narrowing means those who have not had a failure are not covered at present. Notice to class members and any eventual trial or settlement would determine whether the $9,000 repair bills described in the record become recoverable money, and for now the allegations remain allegations while Ford continues to contest them.
This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.
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