2011-2016 GM/CHEVROLET 6.6L DURAMAX LML & LGH NEW BOSCH CP4 INJECTION PUMP
The CP4 High-Pressure Fuel Pump is a critical component of the 2011–2016 Duramax LML 6.6L diesel fuel system, responsible for generating the necessary pressure to operate the direct injection system efficiently. This pump plays a central role in delivering fuel to the injectors at precise pressures, enabling clean combustion, strong power delivery, and optimal fuel economy.
This brand-new CP4 pump is manufactured to meet or exceed OEM specifications, ensuring long-lasting reliability under extreme conditions. The upgraded internal components reduce the risk of common CP4 failures, such as internal wear and metal shavings that can contaminate the entire fuel system. This pump is an essential replacement for maintaining engine performance, fuel efficiency, and emissions compliance in your Duramax-powered truck.
Key Benefits:
- Delivers Consistent High Fuel Pressure – Ensures proper fuel atomization and clean combustion.
- Prevents Fuel System Contamination – Built with upgraded internals to minimize wear and debris.
- OEM-Quality Performance – Matches factory output for stock or lightly tuned applications.
- Improves Throttle Response – Enables more responsive power delivery.
- Supports Emissions Compliance – Helps maintain EPA and CARB regulations.
- Direct-Fit Installation – Designed to fit precisely with existing fuel system components.
- Ideal for Preventative Maintenance – Avoids catastrophic fuel system failures associated with CP4 issues.
- Enhanced Durability – Built to withstand high operating pressures and temperatures.
- Restores Power and Efficiency – Resolves symptoms of weak fuel delivery and hard starts.
- Trusted by Diesel Technicians – A top-rated solution for LML CP4 pump replacement.
Vehicle Compatibility
This CP4 High-Pressure Fuel Pump fits the following 6.6L Duramax LML-equipped GM models:
- 2011–2016 Chevrolet Silverado 2500HD 6.6L Duramax LML
- 2011–2016 Chevrolet Silverado 3500HD 6.6L Duramax LML
- 2011–2016 GMC Sierra 2500HD 6.6L Duramax LML
- 2011–2016 GMC Sierra 3500HD 6.6L Duramax LML
OEM Replacement Part Numbers: 12661059, 0445010822, 0986437421
The 2011–2016 6.6L Duramax CP4 High-Pressure Fuel Pump is a vital upgrade or replacement for restoring full fuel system functionality in your GM diesel truck. Built to factory specifications and enhanced to resist internal breakdown, this pump delivers consistent fuel pressure, improving combustion, efficiency, and reliability. Perfect for preventative maintenance or performance restoration, it’s a smart investment in keeping your Duramax running strong
Shipping Disclaimer:
✔️ We ship via USPS, UPS, and FedEx.
✔️ Carrier selection is based on package size, weight, and destination.
✔️ Expedited shipping options are available at checkout.
✔️ Orders are processed within 1 business day (Monday–Friday).
✔️ Orders placed on weekends or holidays will be processed on the next business day.
✔️ Tracking information will be provided once the item ships.
✔️ Shipping to PO Boxes, APO/FPO may be limited based on carrier restrictions.
PLEASE NOTE:
⚠️ Important Installation Disclaimer:
The CP4 High-Pressure Fuel Pump suffers from a high pressure fuel pump issue unique to this year range and is highly sensitive to fuel system contamination. Failure of this CP4 pump is usually catastrophic, causing instant contamination of the entire fuel system with metal particulates. Before installation, the entire fuel system must be thoroughly inspected and cleaned, including fuel lines, filters, tank, and injectors. Failure to remove metal shavings or other contaminants can result in immediate pump failure and recontamination of the entire system. Improper installation or failure to properly clean the fuel system prior to pump replacement may void all warranty coverage.
BRAND NEW BOSCH 12661059 LML/LGH DURAMAX CP4 PUMP! STOCK REPLACEMENT
BOSCH #12661059,0445010616
**California Proposition 65 Warning: Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.
Visit: www.p65warnings.ca.gov
