I just replaced the engine in my 2003 trailblazer with an engine from a 2007 trailblazer. Started up right away. Shut down to check coolant, now will not start and flashes code P1512. Any suggestions? Thank you in advance
P1512 = Control Module Throttle Actuator Position Performance
Did you clean the throttle body? Disconnect the battery again for 30 minutes while cleaning it. Beyond that, check the wiring for the throttle body and pedal sensor. Beyond that, sounds like the throttle body may be defective. If you have a spare from the old engine, clean it and swap it in.
Disconnected battery overnight, cleaned throttle body. Reattached battery today she fired up and is running. Still have some issues to work on. But now I know that it will run. Thank you for all your help.
Is still running but has Check Engine light and Power Reduced light on. Had same lights before engine swap. Question I have is should I replace throttle body or keep looking? DTC code P1512 is still coming up.
update. ordered a throttle body online. Just installed it. Reduced engine power light went out and it's running smooth. I'm sure there might still be some issues popping up. But I want to thank you for the insight and help.