This article will help you understand what an RPO is, how to find yours and when it will be needed. An RPO or Regular Production Option is a GM-specific code, made up of 3 characters, that helps the manufacturer specify what configuration of options has been or needs to be applied to a vehicle. This can include anything from paint color to powertrain options. For Chevy/GMC Duramax trucks each type of engine can be signified by a different RPO code.
So, why is it important to know the RPO code for your engine? Simply put, knowing your RPO code is like knowing the name of your specific Duramax engine. This can come in handy when troubleshooting your engine or when deciding to upgrade. Since each stock turbocharger can also be identified by the RPO Code, knowing the correct RPO will help you when buying an upgraded or replacement turbo. This is also something you will want to know if you are buying a tune for your Duramax. Each RPO code also has a different level of emissions equipment applied to the truck. Which may be an important factor in which one to choose.
How do you find the RPO code for your specific vehicle you might wonder? Most RPO codes associated with GM products can be found by scanning the QR code on the vehicle's door sill. However, if you have an older model there’s an easy way of finding what you need. By identifying the 8th alphanumeric character in the VIN of the vehicle we can determine the RPO code. Here is a chart to help you decode your VIN.
LB7
LLY
LBZ
LMM
LGH
LML
LWN
L5P
L5D
So you have successfully identified your motor’s RPO, now what?
Now you have the ability to take your Duramax to the next level! By knowing what specific engine you have you can identify the parts and upgrades that will be an exact fit. Check out our website at www.duramaxtuner.com for our full list of upgrades for your specific RPO!