ECU Password

ECU Password

Posted by Darren Winsley (Technical MD ) on 28th Aug 2025

There are no places in today's world where passwords are not required. If you didn't already know, most engine computers and other protected modules from the early onset of the EDC17 have their own unique passwords. Being able to read these or having them saved is essential for handling any read/write tasks without entering boot mode, which for some of the very latest ECU's is not currently possible

We are seeing an increase in engine control modules arriving for cloning where the passwords are unobtainable. The percentage is higher for the replacement ECU, but it is also an issue with original units where previous modifications have been made.

There appear to be some patterns that produce this problem when the module in question is otherwise cloneable. If the password or its structure becomes damaged or is not maintained correctly for the processor (memory) in question, the ECU will be rendered unusable. The problems we have encountered arise when attempts are made to reflash a used ECU into another vehicle, particularly when this process cannot be completed correctly for the ECU to be used. Additionally, previous incorrect cloning and failed tune-ups contribute to these issues.

Now you have that long-awaited used replacement ECU in your hand. Are you eager to give the diagnostic tool or an online service a chance to make it work based on no knowledge that it will? Whoa, hang on, just remember, if this fails, the game may well be over, and the chances of successfully cloning your replacement may be doomed to failure!

Experience is gained from our investment in time and money, not that of our customers. So, if you're looking for a reliable service to clone an engine or body control module please start a new ticket with us.