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DHD 700-1000 LML Duramax CP4 Failure Repair Kit 2011-2016 6.6L

700-1000 - Z-DI
Cores Required:
-CP4 Pump
Not Available
Pricing: $3,399.00


If your one of the 3% that experience a CP4 failure on your Duramax, its extremely important to replace not only your CP4, but also its counter parts.

DHD's LML fuel system kit is one of the most comprehensive on the market! Unlike our competition, we include 3 additional high pressure and low pressure hard lines. These hard lines, when not replaced leave the door open for a repeat failure. Each kit is assembled in house with only the highest quality OE parts directly from GM and Bosch resources.

After a catastrophic CP4 failure small metallic debris is spread throughout the entire fuel system. Its nearly impossible to recover or flush all that debris out of the remainder of the fuel system. These small, sometimes microscopic pieces of metal can and will cause repeat failures if not removed. In addition to some fuel system flushing, GM and DHD recommends you replace all of the high pressure fuel system components. DHD's comprehensive repair kit contains all the parts recommend by GM plus some recommended by the tech's here at DHD.

Kit contents:

  • BOSCH®/GM OEM Blue Box Remanufactured LML Injectors (8) - (The Industry Standard for Reman)
  • BOSCH®/GM OEM CP4 Pump (Updated)
  • BOSCH® OEM New LH and RH High Pressure Fuel Rails
  • BOSCH® OEM New Return Line Assembly
  • GM OEM High Pressure Fuel Lines (Pump to rail, rail to rail & rails to injectors)

Kit Replaces GM Components:

  • 12670466
  • 12670474
  • 12670475
  • 12670469
  • 12670460
  • 12670468
  • 12639000
  • 12661059
  • 19256590/12620534
  • 12620532
  • 12651989
  • 12639000


  • 2001-2016 GM Duramax "LML"
  • 8th Digit of Vin is "8"

Core Charge:

The Bosch blue box injectors and CP4 Pump utilized in this kit have a combined core charge of $1200. Send us your pump and injector cores and we will release the service kit once received. If your returning your cores after purchase, they must be returned to us in the original Bosch blue boxes. Credit cannot be issued without the box. The blue boxes are your proof of purchase!



Shipping Information

  • Item Requires Shipping
  • 35.0 lbs.
  • W13.0000” x H13.0000” x L21.0000”
  • Free Shipping

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