Reading up on rebuilt ECU's, I understand that you have to bring the truck to a dealer and have the VIN burned into the replacement ECU, before it will even run.

Any trueth to that? Local Dodge dealer says so and wants $90 to do it.

If that's true, how do you do it to a used one from a different truck?

 

No you dont have to. Just make sure you get the same year and eninge and transsmission as your stock one.

 

Like crazy said, on these you don't need to, but on the newer vehicles you do for emissions testing purposes, if they see a different vin come up on the computer than what's on the truck, they'll fail you for "tampering with emissions control systems"

 

they did not start flashing the comps with the VIN until 98. so we are lucky!!!