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Message: [QUOTE="me2, post: 330896, member: 3825"] Cummins 6.7 ECMs. Caveat. I am not an expert on this topic. I'm only sharing what I have learned. Dates When talking about ECM dates, there are at least 4 dates to be aware of. Maybe 5. Engine Build Date. This is the date Cummins built the engine. Not generally used, but once in a while a partsman will ask for it. This date is on the engine. Engine Warranty Date. This date is viewable in Quickserve. I suspect that Chrysler tells Cummins when the truck is sold and they tag this date as that for warranty purposes. Truck Build Date. This is the date that Dodge built the truck. Note that the engine build date and the truck build date are not the same. The Dodge partsman wants the truck build date, but the Cummins partsman sometimes wants the engine build date. A Dodge parts man can give you the truck build date from the truck VIN. If he wants to. Wreckers like to use truck build date. Truck Model Year. I don't know how to explain this, but you guys know what I mean by it. An 08 MY truck generally starts selling in mid to late 07. All these dates are different and when someone starts throwing around a date, you need to know which one they are referencing. Dodge and Cummins generally get around this issue by using VIN and Engine Serial Number (ESN) respectively, but there are exceptions and everyone else has their own system. So when someone says they have an 08 6.7, it could mean Cummins built it in 08. It came from a Dodge truck that was built in 08. It came from a 08 model year Dodge truck. It shipped to the customer in 08. There is one other applicable date, that being the emissions certification date. 6.7 ECMs. Thus far there are two versions of the Dodge 6.7 engine. The first was is commonly referred to as the 07.5 to 09.5. When people say this, they are referring to MY. The second version is commonly referred to as 09.5+ or 09.5-11. I know of the following major differences between the two engines. 1) The later engines use different rods. Still cracked cap though. 2) The later engines use a different ECM 3) The later engines use different injectors 4) The later engines have a port on the turbocharger to allow the VGT vanes to be flushed There might be more differences. I don't know when the exact break in production occured (ESN or date) or if it all happened at once or if the changes were made one at a time. I expect that the ECM and injector changes went hand in hand, but I have no proof. There is probably a Dodge document somewhere that lists an ESN break associated with the 09.5 engines, but I don't have any good Dodge connections and I haven't pursued it. Why do we care about this ? I'm guessing that most of us are probably going to use EFI Live to program the ECM in our swap engine. Turning off various error codes that aren't applicable, turning off the SKIM functionality, changing the transmission type, changing the tire size, etc. FWIW, its not absolutely necessary to use EFI Live to do this, but it is one heck of a lot easier than trying to do it at the dealer. Don't believe me ? Buy an ECM and ask your local Dodge dealer to program it for a manual transmission, no skim and oversized tires. Even if you can give him the VIN number of a truck with those features and even if you wire up a bench harness, they will probably refuse to do it. It turns out, as of this writing, that EFI Live is capable of programming the 07.5 to 09.5 ECMs and not capable of programming the 09.5+ ECMs. So at this time if you want to use EFI Live to handle some of the ECM issues, you need to use an 07.5 to 09.5 ECM. Cummins has a system for naming their ECMs aside from the model years of their customer's vehicle. Actually if we wanted to get further into this we'd talk about CPL numbers, but for right now lets leave it at the ECM level. The 07.5 to 09.5 ECM is a CM2100. The 09.5 to present ECM is a CM2200. However, its not quite that simple. If you take an ESN and go into quickserve, they might call it a CM2100 in one section and a CM2150 in another section. I have no idea what the differences are or why. But for the purpose of this discussion, lets stick to CM2100 and CM2200. EFI Live can program the CM2100 ECMs but it cannot program the CM2200 ECMs. Here are the CM2100 (left) and CM2200(right) ECMs side by side. [ATTACH=full]86227[/ATTACH] They look dramatically different and use different connectors. In the 09.5+ trucks the ECM controls the automatic transmission. In the pre 09.5 trucks, the "chassis controller" or whatever they call it on the diesel trucks controls the transmission. Here is a picture of them separately. Notice that the ECM model is printed plainly on the tag as is the ESN that the ECM was originally programmed for. [ATTACH=full]86228[/ATTACH] [ATTACH=full]86229[/ATTACH] The ECM mounting bolt pattern is the same for both ECMs. Either will bolt into place of the other. Continued in part 2. [/QUOTE]