There are only 3 possible causes for that code.
1. Open or shorted PNP sensing circuit between the PCM and the ground for the PNP switch.
2. Faulty PNP switch
3. Defective PCM or possible PCM software update
> I searched for possible Technical Service Bulletins (TSBs) that may address this concern or authorize a software update to correct the problem and found none.
> You have already replaced the PNP switch.
> PCM failures are extremely rare.
This leaves us with an open or shorted circuit that needs to be traced. (which, incidently, should have been checked before replacing any parts.)
Please also review this article:
What Else Could Be Wrong?
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