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In the 2003 Chevy TrailBlazer, the rear wheel speed sensor can be found on the left side of the transmission, mounted on the output shaft. To replace it, you'll need to raise the vehicle with a jack and get underneath it to reach the sensor. This sensor is important for measuring the vehicle's speed and transmitting that data to various systems, including the tachometer. It also plays a role in helping the transmission unit adjust gears and torque converter for optimal performance. The price of a new speed sensor ranges from $20 to $50, depending on whether it's an aftermarket or original equipment manufacturer (OEM) product.
You can locate the speed sensor for a 2003 Chevy Trailblazer on the left side of the transmission housing, located directly behind the firewall.