DDP DDPNCP4-421 DURAMAX 11-16 LML BRAND NEW STOCK CP4

The DDPNCP4-421 from Dynamite Diesel Performance is a brand-new CP4.2 injection pump, designed as a direct replacement for the 2011–2014 GM 6.6L LML Duramax. This new unit (not remanufactured) offers factory-level performance and durability, restoring precise fuel pressure and consistent injector function.

The CP4.2 fuel pump is a known weak link in the LML platform due to sensitivity to fuel contamination and wear. Replacing it with a new unit prevents common CP4-related failures and ensures long-term reliability.

Fitment Applications

• 2011–2014 Chevrolet Silverado 2500HD / 3500HD

• 2011–2014 GMC Sierra 2500HD / 3500HD

• Equipped with 6.6L Duramax LML

 Not compatible with 2015–2016 models (use DDPNCP4-422)
 Works with OEM or aftermarket fuel systems using the stock CP4 configuration

Key Features

• New CP4.2 injection pump – not rebuilt or reman

•  Direct bolt-in replacement for early LML Duramax trucks

•  Restores proper fuel rail pressure and injector function

•  No core charge – 100% new product

•  Ideal when replacing injectors or repairing CP4-related damage

•  Works with stock or tuned ECMs

Recommended With

• New or upgraded injector sets for 6.6L LML Duramax

• CP4 disaster prevention kit

• Fuel system flush or replacement after pump failure

• Lift pump or advanced filtration system for added CP4 protection

 If you’re refreshing the fuel system on your 2011–2014 Duramax, DDPNCP4-421 delivers factory performance and peace of mind with a brand-new CP4.2 pump – the only way to go for serious reliability.