Chevy/GMC Duramax 2011 LML Discussion of Chevy and GMC Trucks with LML Duramax Turbo Diesel Engines

2011 duramax no start

  #11  
Old 12-08-2015, 01:10 PM
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Well that would make it an LML with the controversial CP4 pump. Thay have a higher failure rate then the CP3 but not that bad. Thay fail quickly with any contamination such as gas in the fuel.

Ether he was abusing it or he got a lemon. In any case, it does not mean the duramax is is junk or a bad engine. Far from it
 
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Old 12-08-2015, 01:23 PM
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Originally Posted by 2004LB7 View Post
Well that would make it an LML with the controversial CP4 pump. Thay have a higher failure rate then the CP3 but not that bad. Thay fail quickly with any contamination such as gas in the fuel.

Ether he was abusing it or he got a lemon. In any case, it does not mean the duramax is is junk or a bad engine. Far from it
Well he certainly didn't abuse it by any means. It was the junkiest duramax I've ever seen. My other brother had an lmm and ran it with a bullydog on extreme for just over 100k miles and never had any problem other than axle shafts and tie rod ends most mechanically sound motor I've ever been around and he ran about the last 15k miles on a failing vgt that did some wacky **** while driving but that truck could not be killed
 
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Old 07-06-2016, 01:25 PM
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2011-2015 have cp4 pump that are bad about coming apart and putting metal in the lines, fuel rail, and injectors. Have a 2012 in gm shop now waiting for a change out of all that is a complete package, under warranty. Truck has 88297 miles warranty for drive train goes to 100000 miles and end of next year. Gm service just needs the last 8 of vin. and mileage to look up if under warranty. out of warranty parts are 4500.00 and over 30 hours labor.
 
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Old 01-06-2017, 12:00 AM
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Originally Posted by brokensmokin View Post
bought a 2011 duramax last week and I'm having some problems. the truck won't start unless i give her a shot of either. i know i know don't use either! but once i give her a shot of it she starts right up and runs great but if i shut it off she won't start back up. I've replaced the injection pump with a brand new one from gm and still the same problem.i look and my scanner and it isn't building the pressure that the computer is commanding but as soon as i give her a shot of either she starts and has no problem holding the pressure commanded.
I've talked to a few people and they say that she needs injectors.
iv checked for code and i don't have any except for a glow plug. now before i did the injection pump i had a low rail pressure code but i don't seem to have it after i replaced the pump.
any ideas??? any and all help would be appreciated!
Did this pump being a cp4 ever explode by chance? Have you ever had problems with it?
 
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