Judge Allowed Paccar Fuel Injector Lawsuit
A federal judge ruled that a lawsuit against Paccar regarding engine fuel injector defects may proceed to trial.
Updated on Oct. 13, 2026 in Trucks
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A U.S. District Court judge rejected Paccar's motion to dismiss a lawsuit alleging that fuel injectors in EPA 2021 MX-13 engines were defective. The case involves 31 plaintiffs seeking damages for engine power reductions and breakdowns.
Why it matters
The lawsuit claims Paccar failed to disclose that it lacked a permanent fix for injector deposits, which plaintiffs allege caused persistent engine failures. Paccar continues to deny breaching its warranty obligations regarding the engine components.
Paccar extended its injector warranty coverage to 10 years or 435,000 miles to address performance issues. Some plaintiffs reported significant maintenance burdens, including one owner who endured 19 repair visits and 110 days of downtime.
The players
Paccar
Paccar is a major manufacturer of commercial trucks and engines under brands like Kenworth and Peterbilt.
Robert S. Lasnik
Robert S. Lasnik is a U.S. District Judge presiding over the warranty litigation in federal court.
Little Diesel Transportation
Little Diesel Transportation is a trucking company based in Branson, Missouri, that is one of the plaintiffs in the lawsuit.
The details
Plaintiffs allege that fuel deposits disrupt fuel delivery in MX-13 engines, leading to repeated power losses. While Paccar introduced cleaning protocols in March 2022 and redesigned injectors in April 2023 and June 2024, the court is now reviewing whether these measures sufficiently address the underlying engineering flaws.
Timeline
May 2021: Production began on the EPA 2021 MX-13 engines.
March 2022: Paccar issued instructions for dealers to clean injectors.
April 2023: The manufacturer introduced a modified injector design.
February 2024: Little Diesel Transportation logged its 19th repair visit.
October 1, 2026: A federal judge ruled that the warranty lawsuit could proceed.
Roadmap
The case highlights the growing complexity of maintaining modern, emissions-compliant diesel engines as manufacturers face increased scrutiny over component longevity. This dispute underscores the tension between federal emissions mandates and the practical reliability requirements of commercial trucking fleets.
Owners of trucks equipped with EPA 2021 MX-13 engines should track their warranty coverage limits and maintenance records closely, as the 435,000-mile extended warranty remains in effect. The outcome of this trial may determine whether additional compensation becomes available for those who faced significant downtime.
The takeaway
Commercial operators experiencing recurring power loss should document every repair visit to ensure eligibility for potential warranty claims. Keeping detailed logs of vehicle downtime is essential for building a case regarding operational losses associated with engine defects.
Further reading
For more on industry maintenance trends, visit the Trucks section.
Source note: This article includes information reported by Land Line Media.
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