H3 P0121 error. What is it ?

[lsv_palana]

Hello dear friends. What mean p0121 ? How can i fix it ? Dashcommand says something about pedal position.

Main spare part for my Hummer while off-roading - sattelite phone !

 

[3Hummers]

Throttle position sensor or possibly ECM. Have never had that code.

 

[f5moab]

My recommendation is to clear the code, and see if it comes back. It's a type B code that means TP sensor performance . Also see if it comes back with a P0068 (throttle body airflow performance).
Also, might want to take a look into the throttle body and see how dirty it is. Cleaning the throttle body might help.

 

[lsv_palana]

Where is throtle body ?

Main spare part for my Hummer while off-roading - sattelite phone !

 

[Best4x4]

I've had that fault and B2AAA ever since I sent my PCM off to have the efan setting enabled.. Probably didn't help my PCM got lost in the mail, and showed up 2 weeks late. I'll look into a replacement PCM one day, but currently I just reset it via my Scangauge II.