09 6.0 engine wiring harness compatibility?

[Fred Neal]

Hi all. My son has a 2009 GMC Sierra 1500 with the 6.0. we are wondering can we use a engine wiring harness for a 5.3? Also what year range can we use. 

[CamGTP]

What is the reason for wanting to use it on a 5.3?

 

The 6.0 in those trucks is based on the L76 engine, so it has VVT and AFM/DoD. So to use it on a 5.3 and have all connectors work it would only work on a 2010+ GEN 4 5.3 engine because those are VVT/AFM engines.

 

The harness could be used on an older 2007-2009 5.3 engine but the VVT wiring wouldn't be used and the calibration/tune would have to changed because of that. Or VVT would need to be added back in the 5.3.

 

I know for sure that the MAP sensor connector wiring was changed on 2010+ if I remember right so two pins would have to swapped if you were using the older MAP sensor.

 

So it's simple but also minor complications.

[Fred Neal]

Sorry my mistake, I need a 6.0 harness. Wondering if a 5.3 would work instead.

[CamGTP]

Then a 2010-2013 harness is going to be the most similar because it already has VVT and AFM wiring like that 6.0 does.

 

Like I said though the MAP connector is different on the newer harness because they used a different MAP sensor on those years. I almost forgot too, the MAF sensor is different on 2010+ as well.

 

Finding a 6.0 harness is likely tough because they only made that engine for a few years.

 

Or find an older 5.3 harness and wire in the VVT stuff. I suppose there are many ways to do it but each involves extra steps unless you can track down the exact harness.

Edited October 21, 2021 by CamGTP

[dna9656]

Junk yards have a interchange manual, I can't remember the name of it, but better yards will have one and they can give the correct answer.