2002 chevy trailblazer: My battery died and when I replaced it my 4x4 selector switch had no lights,4x4 wouldn't engage,and service 4x4 light was o

SOURCE: '2002 yukon service 4x4 light on

Most of the time this problem is caused by the 4 wheel drive switch. Usually you can just replace the switch and that will fix the problem. I have replaced many of those switches and that has fixed the problem.

SOURCE: 2002 Chevy Trailblazer's 4x4 control

I have a 2002 chevy trailblazer 4x4 control light not working. when trying to switch from 2wd to 4wd nothing happens. no ligth no engaging of the drive

SOURCE: 2006 chevy trailblazer replace 4wheel drive selector

i've got a 2003, and i believe the parts and procedures are the same for the years. there are screws in the dash trim by the ciggarette lighter, and more on the underneath of the dash pad where the gauge cluster is. then carefully pop the dash trim out. there are retaining clips that hold it in besides the screws. they should pop out without too much effort. i'd start near the radio and be careful. there also may be two more screws near the bottom of the steering wheel that you'll have to remove the trim below it to get at.

SOURCE: 2002 GMC envoy SLT 4x4, tccm, switch problem

About 45% of all transmission problems are due to a defective battery, its components and the charging system. Make sure you have the correct battery in the vehicle and inspect all items relating to the charging system and the battery. The vehicle should charge between 13,5 to 14.5 volts. The condition of the belts is part of this inspection. If all of this is A-ok then get a scanner and pull the codes in the PCM.
Remember once light is illuminated for a item that item no longer works. Once you've gotton to this point let me know and I'll walk you threw it. Hopefully its just a weak or incorrect battery or something along those lines. Good luck and keep me posted

Ryan Lutton

• 1267 Answers
• Posted on Jan 19, 2011

SOURCE: My 2002 Chevy Trailblazer I turn on switch for 4X4

Have your TCCM checked out. That's transfer case control module.