Hi,
If the power supply is good, the relay is good, we have ground for the relay, and there are no wiring issues, it's time to start testing.
If you look below, I attached the directions specific to the P0480. There is a chance the PCM may have failed, but the directions need to be completed to make that determination.
Take a look through them and let me know what you find. I realize parts of the diagnostics have already been performed, but make sure all bases are covered.
Let me know what you find or if you have questions.
Take care,
Joe
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Wednesday, September 7th, 2022 AT 8:04 PM