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Old 11-02-2022, 11:15 AM   #1
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Duramax L5P Engine Failures

I am not suggesting that there is any problem(s) with the 2017 to current L5P Durmax Engines. I am curious owning a 2021 L5P myself if anyone has had any serious issues with this engine.
In doing research I find problems like NOX Sensors, DEF heaters / tanks, and injector electrical plugs, but that is about it.
Please let us know what your experience has been if you own a L5P equipped GM truck. I am not interested in opinions, or something you might have heard, only your experience as an owner. Thank you!
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Old 11-02-2022, 12:24 PM   #2
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Mine has been very reliable and 90% of its life is short in-town trips. I did replace a temperature sensor at the suggestion of owners on a Duramax site, and I have an Edge CTS monitor I use to keep track of temps, etc. I have no complaints yet.
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Old 11-02-2022, 12:37 PM   #3
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I purchased a new 2022 Denali 2500 diesel in March which now has 4600 miles.
No issues.
I love this truck!
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Old 11-02-2022, 02:18 PM   #4
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Quote:
Originally Posted by BirchyBoy View Post
Mine has been very reliable and 90% of its life is short in-town trips. I did replace a temperature sensor at the suggestion of owners on a Duramax site, and I have an Edge CTS monitor I use to keep track of temps, etc. I have no complaints yet.
This is the part I replaced. When I replaced it at 36k the little cage around the sensor was gone.

GM ACDelco Original Equipment 12681993 Intake Air Pressure and Temperature Sensor https://a.co/d/g6KlnkF
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Old 11-02-2022, 07:21 PM   #5
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Map sensor failure due to not using a winter front. Injector connector failure, cylinder #4, that caused a quite a ruckus.
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Old 03-16-2023, 03:56 PM   #6
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The L5P motor seams to be one of the most reliable Duramax's I have owned. They are work horses don't treat it like a 1/2 ton work it will last and get the job done fairly easy. Some guys buy these trucks as a daily driver and never work them and may not know how to maintain them.

the 2020 and early 21 trucks had a DEF tank heater issue that was fixed with a reflash and possible a tank heater and harness ( the connector burned up 2 pins at the tank ) . Mine has been fine now 2 winters since the repair by GM.

DEF , if your not working the truck your going to have a system with possible problems of clogged DEF injector.
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Old 09-17-2023, 07:32 PM   #7
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Iím having problems with my 2021 GMC 3500 DRW diesel, Nox sensor at first and now injector problems at 62,000 miles I had transmission problems but that was caused by the dealership.
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Old 09-24-2023, 07:20 PM   #8
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I have a 2018 3500HD that I bought used and in the 2 years driving it have only replaced both NOX sensors and the antifreeze reservoir because of failed sensor. Otherwise all runs and works we
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Old Today, 12:01 PM   #9
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I have a 2017 3500 SRW SLT with 81500 kms. The issues I have had are:

- replacement of the coolant tank due to bad level sensor
- replacement of tranny cooler line due to rubbing on front bracket
- replacement of the block heater due to risk of fire (twice now so on the third one)
- replacement of glow plugs in #4 and #8
- replacement of side trailer mirrors - don't open/close when its cold out.

It is a solid truck and I am very happy with it but I do have a 2024 3500 AT4 on order.
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