Check engine is coming on , throttle response has a hesitation. I can turn off ignition and let it sit for a minute and the check engine light goes off. I stopped and got fuel and it came back on . I found a thread for diagnosis of the 08 models I need info for the 09 FLHX the code come up is P55P66.

 

Try this Harley Diagnostic Codes - Harley Davidson Forums

 

Thanks, the code said Twist grip sensor. Book mark the thread for the codes..............................