What is the p2101 code for the chevy trailblazer?

Let's go ahead and unpack what the P2101 diagnostic trouble code (DTC) means on Your Chevrolet TrailBlazer. When Your engine control module (ECM) detects an abnormal situation in Your throttle actuator control (TAC), it'll illuminate the check engine light (CEL) and You'll find this DTC with a scanner or other ODB-II tool. So that leads to the obvious question, but, what's a TAC Well, the throttle actuator control motor just controls the throttle electronically; these systems are also called "drive-by-wire". When You hit the accelerator pedal on a vehicle like Your Trailblazer, that sends a signal to the TAC motor to open and close the throttle plate. In a nutshell, it controls how much air enters the engine when You've got Your foot on the pedal. It's physically attached to the intake manifold using three or four bolts sealed with a gasket. So, what's actually causing the fault Could be the TAC motor failing, the sensor in the pedal failing, the actual throttle position sensor being faulty, or an open or short in the actuator circuit. This is really one You ought bring in to the dealer to have them look at.