pcm code P0720 trans stuck in second gear?
 

hey guys, im in dire need of help, i have an 05 model 4x4, i can take off, slow or fast, and it engages second gear and then it will red line without shifting unless i release the throttle and immiediatly get back on the trottle, then it shifts fine from there on, but only does it once after each time the truck is started. but any other time its fine. could it be my gov. press. sensor and or solenoid?
truck has just at 90,000 miles on it. help please.

thank you in advance.

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oops.. i forgot to mention that the MIL light cam on and i pulled the code and it was the p0720 (output speed sendor circuit malfunction).