Hmmm, the PCM does store the mileage in its non-volatile memory. But it varies from vehicle to vehicle, many the mileage in the PCM is just for maintenance and calibration reference. I have swapped out PCM's in a '99 Neon and it did NOT change the mileage in the odometer, but it had a electro/mechanical driven odometer. In most cases its stored in the instrument cluster, but it is possible it could be read from the PCM.
The Dealer has the tools to program the mileage into the PCM, I'm sure they can do the same Instrument Cluster as well. You're going to have to take it to the Dealer or someone with the tools to program those things anyway, so I wouldn't worry about it.
The PCM has an anti-theft measure where it will refuse to start unless the VIN# programmed into it matches the VIN# on other control modules. So, if you do this work yourself, you're going to have to either get it towed to the dealer, or try to drive on the 4.7L PCM controlling the 6.1L hemi motor to the dealer. Just tell them to do the mileage in the PCM and odometer also.
Look at the title transfer section of your title or registration, it usually will talk about the State Law about Odometers. Every state I have registered vehicles, (never WA though) it talks about the penalty of perjury to misrepresent the actual mileage of the vehicle, and an check box option saying the odometer is accurate or is inaccurate.
I take that to mean, its NOT illegal to have the wrong mileage on the odometer of "your" car, its just illegal to state the mileage on the odometer is accurate when in reality it is NOT.
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