Originally Posted by edgar0400
Hey guys I have a problem with my 2009 sierra 5.3
The service engine light came on and I have tested showed code 121 tps sensor some body toldme to clean the thottle body wich I did and now ny truck idles at over 2000 rpm
My question is do I need to replace the throttle body?
What I do next?
I would suggest that you contact your dealer and have them look into this for you. They are in the best position to get this issue properly diagnosed for you. Please keep me posted and if you have any questions please feel free to contact me anytime.
Stacy GMC Customer Service