The 2003 Chevy TrailBlazer rear wheel speed sensor is located on the driver's side of the transmission mounted on the transmission output shaft. You will have to jack up the vehicle and crawl underneath to gain access to the speed sensor. The speed sensor is used to measure how fast the vehicle moves and will send that information to other vehicle systems including the tachometer. This also helps the transmission unit to help control the gears and adjust torque converter for the optimal efficiency and power. The cost for a replacement speed sensor will vary from $20 - $50 depending on the if its an aftermarket or OEM product.
Tomas L
July 16, 2020
The 2003 Chevy trailblazer speed sensor can be found on the drivers side of the transmission housing just behind the firewall.
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