Industrial Injection 0986437421-IIS Remanufactured CP4 High Pressure Fuel Pump for 6.6L Duramax LML/LGH

The Industrial Injection 0986437421-IIS is a Bosch remanufactured CP4.2 high-pressure fuel pump designed as a direct, drop-in replacement for the original equipment pump on 2011–2016 GM 6.6L Duramax LML and LGH diesel engines. Built to the same demanding standards as a brand-new unit, this reman pump restores proper common-rail fuel system operation and meets all OEM emission requirements.

Key Features:

• Remanufactured by Bosch using OEM-specification components
• Tested to original equipment (OE) specifications for guaranteed performance
• Drop-in ready stock replacement — no modifications required
• Meets all applicable emission requirements
• 2-Year Bosch Warranty included
• Features updated housing, camshaft, roller tappets, and integrated gear pump

OEM & Cross-Reference Part Numbers:

• Bosch: 0986437421, 0986437421R, 0445010802, 0445010817, 0445010687, 0445010616
• GM: 12645103, 12645102, 12661059, 12639151, 12638262, 12658095, 98077841
• CP4-421R

Note: A refundable core charge of $275 applies to this purchase. Your original CP4 pump must be returned after purchase. The core will be inspected upon receipt, and the charge will be refunded if it meets return qualifications.

The Bosch CP4.2 is a radial piston, twin-cylinder high-pressure pump capable of generating up to 39,000 PSI (2,700 bar) to feed the common-rail fuel injection system. Choosing a Bosch-remanufactured unit ensures your replacement pump meets the same tolerances and performance benchmarks as the original — at a more cost-effective price point than an all-new pump.