Question

2004 Dodge 2500 5.9L with code P2121, what does this mean? throttle/pedal pos sensor?

Answer 1

Hi there,

This means there is an issue with the electronic throttle position sensor at the gas pedal. This can be caused by loose wiring at the connector or corrosion. It is possible it's a problem with the wiring to the computer as well. It's best to use a scan tool that can read live data to check this.