WelcomeI had boughten a 1997 GMC Sierra K1500 with a 6.5 Turbo Diesel. I had completely removed the egr valve and changed the center head to be a delete but still bringing up the code. Do I have to change the ECU if so could I just flash it myself instead?
The ECM will need a tune programmed into it. to remove the code.
If you have the programming equipment you could do it yourself.
Otherwise, you'll need to send the ECM into a vendor like Kennedy Diesel to get it programmed