LML 2011-2014 engine differences??? [Archive] - Duramax Diesels Forum


View Full Version : LML 2011-2014 engine differences???

12-30-2014, 02:40 PM
I need some help here from anyone who has experience working a lot of different LML's...Im trying to track down some wiring harnesses for a customer that I will be converting to standalone. The engine is a 2011. When I look up the harness (the main engine wiring harness with the fuel injector connectors on it), there are two different part numbers for 2011...and then 2012 has a different part number...and then 2013-2014 have a different part number too.

So there are 4 harnesses total... two for 2011, one for 2012, one for 2013-2014.

One of the 2011 harnesses is not available from GM. The other 3 harnesses are all readily available from GM. But they all have radically different prices. One of them is $150 more expensive than the other.

Does anyone know what changed, if anything, on the LML between 2011-2014? For all I know, the harnesses could all be identical, but just from a different manufacturer or something. Or some wires are different colors, etc.

I want to say in 2012 they redesigned the DEF tank, so maybe the DEF connectors are different on the newer harnesses? In which case I would obviously just get the cheaper harness because the DEF/emissions stuff will all be removed anyways...

Kind of in a time crunch here, so if anyone has any ideas, that would be great.


12-30-2014, 02:46 PM
I've seen LML's with and without the EGR bypass pipe which would eliminate the EGR cooler bypass valve, but I couldn't see that making that big of a difference in relation to the engine harness.

12-30-2014, 02:57 PM
Probably not much help but maybe the 2nd harness your seeing for the 2011 is the cab/chassis LGH? These are also minus the egr cooler bypass pipe.

12-30-2014, 03:17 PM
ok I found one difference... 2013+ LML's have a humidity sensor. And 2012+ has the analog 0-5v brake pedal position sensor instead of the on/off switch. Apparently that wiring for the BPP sensor goes through part of the engine harness. I knew about the difference in brake pedal sensor previously, but I didnt know it went through the engine harness until now.

I guess I kinda answered my own question, haha.

12-30-2014, 05:41 PM
I can't think of any difference in sensor location, connector style or other parts on the engine by its self.
I would say that gm doesn't change parts numbers when they change suppliers unless the part is actually different.