[Dudehog]

Probably a yes or no question but is it a second hand ECU just a case of plug and play into my car?

 

[badgx]

I did a Merc m113 c43 engine swap to e55 lump both ecu and egc were plug and play, i couldn't believe how easy that was. The engine wiring harness and plugs were all identical.

If its just the engine ecu I reckon the 5.7 and 6.1 should swap, it may need to be reflashed, 5.7 has an mds feature.

 

[JGarten]

Pretty sure most cars require the VIN programmed into the ECU. Many eBay sellers do it for free. If the replacement ECU's VIN does not match the SKIM module (or whenever our cars have that disables the ignition) then no start!