Tired of the CEL and the erratic 545, one day everything is roses, the next day it's 3200 RPM @ 70mph. There's no rhyme or reason, the light comes on leaving work.
The next morning the dash is clear, no issues going to work. Many searches on several forums on causes, considered replacing the solenoid block. If it didn't come and go so randomly, would have replaced it. Found a thread on here about these issues today, fellow suffered with the same problem for a year. Replaced the PCM as a last resort and solved his problem. We'll see.

 

Good luck, hope it works for you.

 

I may have to get a PCM also. Where did you get yours and how much, if you don't mind me asking?

 

Bajabob,

Bought it from CarComputerExchange in Cary North Carolina. Bought it last Monday night, they had a $60 off going and paid $199 for it.
That discount may pop up for everybody that goes to their website.