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GM Duramax CP4 Fuel Pump Settlement

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General Motors LLC settled allegations that the Class Trucks had a defective high-pressure fuel injection pump known as the CP4 pump, that the pump is unreasonably fragile and prone to catastrophic failure, and that GM knowingly concealed this defect. General Motors LLC denies any wrongdoing and the court made no finding of liability.

A settlement over an alleged defect in the CP4 high-pressure fuel injection pump fitted to model year 2011–2016 Chevrolet Silverado and GMC Sierra trucks with a 6.6L Duramax diesel engine, bought from GM-authorized dealers in seven states. The claim filing deadline of November 6, 2025 has passed.

Who can claim, how much, and by when

How much is the settlement fund?

$35,000,000

When is the claim deadline?

Who is eligible?

People who bought a model year 2011–2016 Chevrolet Silverado or GMC Sierra equipped with a 6.6L Duramax diesel engine from a GM-authorized dealer in California, Florida, Illinois, Iowa, New York, Pennsylvania, or Texas from March 1, 2010 through September 13, 2024.

How do you get paid?

The official site describes two funds. A $30 million Repair Fund paid Class Members who paid out of pocket for a CP4 repair that was not covered by warranty; the site states the payment depends on how many valid claims are received and could range from $6,356 to $12,712. A $5 million Former Owner Fund paid Class Members who no longer own their trucks and did not pay out of pocket for a repair; the site states that payment could range from $400 to $800.

What proof do you need?

A claim required proof of purchase — such as a purchase agreement or financing documentation showing the claimant's name and the name and address of the GM-authorized dealer — plus proof of repair. Former owners who sold the truck before May 6, 2025 and did not pay for a repair had to submit proof of sale instead.

Who is administering the settlement?

JND Legal Administration

Can you still claim?

See the official settlement site

This information is not a substitute for legal advice.

Verified on . Based on Official Settlement Website — Chapman, et al. v. General Motors LLC, Case No. 2:19-cv-12333-TGB-DRG (JND Legal Administration, 2026). See the method.

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