Low rail pressure, long cranking, or metal in the fuel system are common signs of a failing CP4 pump. The Bosch 0986437421 is a remanufactured CP4 high-pressure injection pump for LML/LGH Duramax 2011-2016.

Match your OE pump number and install with clean fuel and a healthy low-pressure supply so the new high-pressure pump is not damaged on startup.

What you get

• Bosch 0986437421 CP4 high-pressure injection pump
• Remanufactured by Bosch
• Fitment: LML/LGH Duramax 2011-2016
• Warranty: 2 Year (as listed)
• Refundable core charge applies — returned when your old pump is sent back per our core terms

Specs

• Part number: 0986437421
• Type: CP4 high-pressure injection pump
• Condition: Remanufactured
• Manufacturer: Bosch
• New alternate: 0445010817

Pair with clean filters and a healthy lift pump or tank module so the high-pressure pump is protected. A refundable core charge is added at checkout and refunded when your old pump is returned per our core terms. Verify fitment for your truck before ordering.