Transmission RPO Codes for 2023 GMC Sierra 3.0L Duramax 4 wheel drive 10 speed

[Loadmaster]

When I search my VIN it pulls up all of the info less the transmission.  My scanner ask me to select which RPO "Type" trans I have.  Where might I find this? 

These are my choices:

MHS
MHT
M12
MQB
MQC

[newdude]

1 hour ago, Loadmaster said:

When I search my VIN it pulls up all of the info less the transmission.  My scanner ask me to select which RPO "Type" trans I have.  Where might I find this? 

These are my choices:

MHS
MHT
M12
MQB
MQC

 

 

 

You should be able to scan the QR code in your driver's door jamb with a QR reader.  It contains the SPID label with most of all the RPO options for your truck aka the build sheet.  

 

3.0 LZ0 Duramax uses MQB and MQC.  MQB is column shift, MQC is electronic console shifter.  

[redwngr]

Also, MQB and MQC are only used with the 3.0L.

 

Presumably they include tuning for the lower rpm torque and HP curves of the 3.0L.

 

 

@newdude are there 'hard part' differences too?

Edited July 10, 2025 by redwngr

[Loadmaster]

Guys, I appreciate your replies.  I learned that the label on the driver's side door jam has a QR code.  Scanning this code gave my truck's RPO codes.  I guess you can teach an old dog a new trick!   

[newdude]

4 hours ago, redwngr said:

Also, MQB and MQC are only used with the 3.0L.

 

Presumably they include tuning for the lower rpm torque and HP curves of the 3.0L.

 

 

@newdude are there 'hard part' differences too?

 

 

I'd imagine its torque converter for sure and possibly valve body?  Not sure what else but I can take a gander tomorrow.  

[newdude]

 

16 hours ago, redwngr said:

Also, MQB and MQC are only used with the 3.0L.

 

Presumably they include tuning for the lower rpm torque and HP curves of the 3.0L.

 

 

@newdude are there 'hard part' differences too?

 

 

 

So.  L84 (5.3) and L87 (6.2) share torque conveters and valve bodies (one body for column cable shift, one for electronic console shift-by-wire).  Diesel has its own p/ns for converter and valve bodies (again difference in those being how the shifter is).  

 

Looking around at a bunch of other hard parts, they all appear to be the same gas or diesel in the 10L80s.  They even share the same Transmission Control Module so the difference in that obviously being tuning for engine applications.  One module that can handle both based on how the programming is written.