P0121 GMC -

Question

where is the sensor located on a 2009 GMC Sierra?

Answer 1

P0121 Throttle position sensor 1 performance

The condition for setting this code is when its predicted MAP and air flow is out of it calibrated range, intake leaks can and do cause this code so that has to be inspected.a throttle body sleaning should also be performed, The throttle position sensor for this vehicle is under a recall.Check with the Dealer for this campaign.