Common Problems: The CP4 Time Bomb

December 2017 Tech Corner, Feature Trevor Mason

CP4 Pumps

To kick things off, we’re going to look at something that’s very near and dear to our hearts: the CP4 injection pump on 2011-present LML Duramax engines. Boy, where to begin? People have taken a somewhat hyperbolic approach and refer to the CP4 as a time bomb, among other colorful terms. The thing is, they’re not too far from the truth. Even if you have a 100 percent stock pickup, there’s a [really] good chance that you’re going to be on the receiving end of a $10,000 bill when it finally goes out on you and destroys your entire fuel system.

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