I have an 03 ho with 48re that I've been driving with a p2509 code and crank sensor codes. after checking and cleaning all the grounds, fan wiring, and repairing a broken wire to crank sensor "a". I have only p2509 remaining but today the trans started not shifting
out of 2nd gear. I then cleaned and reseated the PCM connectors and cleared all codes. CEL is now off, but my cheapo code reader still shows p2509 and trans still will not shift. I have the usual solenoid and sensor on order, but is there a trans limp mode or something I'm not seeing how to clear?

 

Not sure about the limp mode, but I hope you caught it before needing a rebuild. Like many, I had the 2-3-2-3-2 shift shuffle. $2200 later, she shifts better than new. Good luck and stay safe.