Where is the g sensor

This Gravity (G) sensor is a vertical low-g (gravity) acceleration sensor. By sensing vertical acceleration caused by bumps or potholes in the road, the powertrain control module (PCM) can determine if the changes in crank- shaft speed are due to engine misfire or are driveline induced. If the G sensor detects a rough road condition, the PCM misfire detection diagnostic will be de-activated.

It's mounted in a bracket on the frame .I believe it's on the right rear of your rodeo underneath on the frame rail behind the tire. It's a dealer only item