General Motors Offers Truck Owners $12,000 Payments in Fuel Pump Settlement Joshua ValeroNovember 13, 2025GM CP4 fuel pump defect, Duramax diesel CP4 lawsuit, Chevrolet Silverado HD fuel pump failure, GMC Sierra HD CP4 fuel pump, California Lemon Law GM diesel truck, GM heavy-duty diesel fuel system metal shavings. Meta description: Learn about the CP4 fuel pump defect in 2011-2016 GM Duramax diesel trucks, how it causes engine damage, and your rights under California Lemon Law.