Hello, My check engine light and now my ABS light in my truck won't go off. They've been on for months. I got a tune up last November and the engine light went a away for a few days, but has been on ever since. Also, I had my truck in 4 Wheel Drive for a little while a few weeks ago one day when it snowed really bad and ever since it seems like my car sounds louder when I drive.

Answer: You are going to have to get the computer codes scanned for the engine computer and the ABS brakes computer. Some codes are related to each other and can be caused by one common thing.

Common for and ABS code on your Chevy Trailblazer is a front wheel speed sensor has gone bad. When this happens the com0ut`er does not know the speed of each wheel related t5o each other so it cannot control the system and sets a code and warning light.

The check engine light could be any number of things and i could not even guess without having the code number(s( that are stored in the computer