Question

I have a 2008 Chevrolet Silverado 1500 with engine code P1121, what is the meaning?

Answer 1

Hi there

This code is an issue with the throttle position sensor 1 performance. In most cases, the issue is with the throttle position sensor itself. Here is some more info on the code for you.

P0121 CHEVROLET - Throttle Position Sensor 1 Performance
Read more: https://www.autocodes.com/p0121_chevrolet.html