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cp4

  1. 11-16 LML Duramax Powertrain
    I have a 2013 and about 2 weeks ago i had the p0191 code and i replaced the the FPr2 on the LH fuel rail it cleared the p0191 code and then a few days later the check engine light came back on and started throwing the P0087 code i haven't noticed any changes in performance or this all started...
  2. General Discussion
    I have this GM extended warranty on my 15 GMC 2500 LML. I'm curious if anyone has had this warranty and made a claim for a CP4 failure. I would like to know if they covered the entire repair (replace/clean entire fuel system) or just replacement of the pump.
  3. 11-16 LML Duramax Powertrain
    hello everyone I just purchased a 2015 LML Duramax with 160,000kms (about 100,000 miles) it is bone stock, one previous owner didn't do anything just normal maintenance. I don't know too much about diesels as this is my first diesel truck. I have done a lot of research and am now a bit worried...
  4. 2011-2016 (Non Powertrain)
    I'm embarrassed to admit that I live in Southern California, but it's true, at least for a little longer. My 2012 GMC CCSB LML is approaching 100,000 miles and I tow a 5th wheel on both short and long family road trips several times a year. I've decided to go ahead and address the faulty CP4.2...
  5. 11-16 LML Duramax Powertrain
    2012 2500 LML, 190k miles PPEI 150hp tune, deleted, EGR completely removed, FASS 150 Replaced low pressure elbow into CP4 and low pressure line to low pressure schrader valve test port 6 months ago when it had a fuel leak into the valley Driving home last night, "Check Fuel Filter" light came...
  6. General Discussion
    Hi all, New to the forums here, and new to duramaxs. I am looking to buy my first diesel, and found a pretty clean looking 1 owner '15 with 145K miles. The carfax is completely clean, except that it looks like the injectors were replaced at 75K miles. My question is, would this most likely be...
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