Trailblazer had alot of ground wire issues There should be one on the drivers side a pillar near your feet. also check under hood connections in fuse block there was a lot of pin tension issues.
Elizabeth: It could be the power train module. This is a computer that tells the drive train everything (like what gear to be in and how much gas to add). Part of the power train module goes to your dash lights. It is usually located underneath the center console, or under the driver's seat or sometimes under another seat. You can go to the wrecking yard, get one that is for your trailblazer and try that.
SOURCE: four wheel drive wont engage
If you have push button 4-Wheel Drive, it is recommended that you use it every once in a while, in order to keep gunk, rust, and corrosion to build up on moving parts. The mostly likeley (though not definite) reason would be that you let the 4-wheel drive unused for so long that corrosion has built up on the parts and the actuator that engages the 4-Wheel Drive doesn't have the power to engage it past the corrosion.
You'll need to take it in to be cleaned, or to have parts replaced. In the future, every month or so, engage 4-Wheel Drive and drive around in some mud, grass, sand, or any other loose ground for a bit, just to keep the parts moving and clean.
The service Four wheel drive light is to alert the operator the system is not being read properly by the ECU.
If the ECU loses contact with or position of the Transfer case actuator motor the service light will come on. Same thing goes for the front diff actuator.
So it may be a bad switch, sensor, or an actual problem in the 4WD linkage. This is not a Oil Change light that you can ignore a few extra weeks - it indicates a problem that should be taken care of ASAP to avoid costlier problems down the road.
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SOURCE: 4 wheel drive is binding in 2002 trailblazer
the trailblazers are designed to shift from 2 wheel to AWD on the fly. BUT NOT TO EITHER OF THE 4 WHEEL OPTIONS. I'd suggest you get it to a mechanic to evaluate the damages.
Jer
SOURCE: 4x4 wont engage
There is a switch that has twwo wires going to it, it's located just above the motor on your transfer case,on the drivers side, one plug goes to the motor and the other goes to this switch, it's the motor that shifts it into low and high range, I'm not sure what the switch is called but it tells the front end when to lock and unlock.
Hope it helps
SOURCE: My 1999 chevy silverado 1500 four wheel drive
You probably have a bad encoder motor.It is located on the side of the transfer case on the drivers side.It is black.The other problem they had with these was the switch but you have already replaced this so your next thing is the encoder motor.Hope this helps.Good luck.
SOURCE: 2004 chevy silverado and service
You probably need brakes... (I know the obvious) but if they're dragging means front calipers are extended and sensors are triggering dash lights. I highly suspect you need front brakes.
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