Question about 2003 Chevrolet Trailblazer Ext

1 Answer

4wd I have a 2003 trailblazer and when i turn the switch to any of the 4wd positions the vehicle does not go into 4wd, I did notice that the indicater light that is usually on to tell me what postion the vehicle is in example ( 2hi, auto, 4hi, or 4lo ) is not on. Is this a relay problem or loose connection? Thanks Sam

Posted by on


1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Expert
  • 382 Answers

There is a relay switch box under dash. But there is also a vacuum diaphram in the passenger front fender, which operates the front axle, that turns the light on and off along with the cable movement. Also there is a vacuum switch on the transfer case. When you flip the switch it sends the vacuum to the switch on transfer case which allows the vacuum back to the diaphram to pull the front axle cable. I would check for the vacuum lines first.

Posted on Jan 26, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I just purchased a used 2003 chevy trailblazer LS. I'm not sure if something is wrong or if it's just turned off but when I shut the vehicle off or open the door the ceiling lights do not turn on... It...

Some vehicles have an interior lights override switch or should be located close to the main headlight switch..check your manual for that override switch..also make sure your manual dimmer us in the on position..good luck

Oct 22, 2014 | 2003 Chevrolet TrailBlazer

1 Answer

4WD does not work. "Check 4WD" light is on

sounds like ur mechanical--getta haynes manual at a part store or go to ur library sec629 for techbooks on any vehicle

Nov 18, 2013 | 2003 Isuzu Rodeo

1 Answer

Radio wont turn off after key is removed and open door. After some time it turns off by itself. Also batt light comes on when I turn key to off position. Power windows still work as well as power locks....

I have the same problem. I found that the stick shift wasn't locked in park possion. Once I locked it and turned the key to off the radio turned off.

Feb 25, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

My 04 TrailBlazer LT popped up the Service 4WD light. I put it in 4WD this morning and had no problems. I went to lunch and put it on and it took a few minutes to switch and then the light came on. It...

MIne will do that only when I'm switching my 4WD to 4low or 4hi, or back to 2hi AND the TB has good traction, ie pavement or rock OR the tires are cranked to one direction. After my wheels are straight, I just turn the engine off, and turn it back on, then the light goes off. Mine won't do that if I'm in mud, snow, or dirt where there's no traction. My guess is that it may be binding when the traction is good, therefore, I shouldn't be in 4WD. Anyway, my 2cents and I don't think you have to worry about it.

Nov 23, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

4 wheel drive does not engage

actuator may need service[lubed ]connection or wiring loose or damaged

Feb 22, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

2004 trailblazer. Service 4wheel drive light comes on and switch will not change drive from 2wheel to 4wheel drive. Problem is intermittent.

The 4WD in this vehicle is computer controlled. There will be diagnostic codes stored that will aid in proper diagnosis and repair of this problem. As there are several common / expensive failure items, it is best to have the codes read using a proper scanner. Some of the cheaper code readers may not work in this instance and a more professional scanner may be needed to retrieve the codes. Once you know the codes, a better, accurate diagnosis can be made.

FWIW - The encoder motor on the transfer case is a common failure item. The instrument panel switch module is also.

Jan 08, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

03 Trailblazer service 4 wheel light activates while turning

check the lubricant in the transaxle, if it is low it will cause the light to come on.

Sep 21, 2009 | 2003 Chevrolet TrailBlazer

1 Answer

2003 xtype

replace your crank positioning sensor

Jul 06, 2008 | 2003 Jaguar X-Type

Not finding what you are looking for?
Cars & Trucks Logo

270 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

77169 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22258 Answers

Ronny Bennett Sr.
Ronny Bennett Sr.

Level 3 Expert

6927 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides