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2002 Chevy Trailblazer LT stuck in a4wd or 4hi. Will not shift to 2hi

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SOURCE: my 2003 chevy trailblazer tries to shift into A4WD

me ajude HELP

Posted on Feb 03, 2010

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1 Answer

2000 chevy suburban stuck in 4 lo anyone out that cant help


Put truck in Neutral while key in run position engine off or on (doesn't matter which). If it's pushbutton 4wd then try hitting 4low again. if that doesn't work some of the chevy trucks required you to press 4hi to get into 4high and then press 4hi again to get back to 2hi, unless yours has a 2hi button. In that case press 4hi to get into 4high and then press 2hi to get back to 2wd. either way you need to be in neutral to get out of 4lo. I have shift on the fly (Mechanical Shifter on floorboard for transfer case) on my 1990 Suburban and still have to put it in neutral to get out of 4lo. Good Luck.

Jan 30, 2014 | 2000 Chevrolet Blazer

1 Answer

Chevy trailblazer 4wd is not engaging 4hi blinking and service 4wd light is on


There are two actuators that activate the 4WD components, one is for the Transfer case modes and the other is for the front axle disconnect. Both of these actuators make a distinctive noise (motor noise) when activated. First thing to do is with engine off and ignition on, switch from 2HI to 4HI and listen for two distinctive noises. If you hear both, more than likely the front spline disconnect assembly (at the front axle) is defective.
In order to troubleshoot the 4WD system, you need to have an understanding of the whole thing, it is not a DIY item.

Feb 21, 2013 | 2002 Chevrolet TrailBlazer

1 Answer

The service 4wd light came on in my 2002 envoy.


There are two motors under the vehicle. The front axle actuator moves ONLY during 2HI->A4WD and A4WD->2HI transitions. The transfer case encoder motor makes a lower pitched noise in every mode transition: 2HI->A4WD, A4WD->4HI, and 4HI->4LO, and the three transitions upwards.

If EITHER of the motors fails to do what the TCCM commands it to do, the switch light will flash and the Service 4WD light on the dash will come on.

If you're a DIY mechanic, you might look into them further, or just take it to a mechanic who knows our systems. The average mechanic is not going to know the theory of operation of the trailblazer/envoy 4x4 system, which is pretty unique in the industry

Mar 11, 2011 | GMC Envoy Cars & Trucks

1 Answer

While set in A4WD the indicator will start


ask another GM dealer, have them check for related TSB's. could be the front acuator.

Jan 02, 2010 | 2005 Chevrolet TrailBlazer

1 Answer

01 blazer-trailblazer, when switching from 2hi to 4hi the light just blinks, it will not engage into 4hi


Check for blown 4x4 fuse if that is good the usual problem is the 4x4 shift module on the transfer case.

Dec 31, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

02 dakota wont shift from 4hi to 2 hi


Try commanding the drive ranges while in netural cycling them. This may normalize the controller that senses the position from the encoder motor assembly. There maybe a procedure for that in a service manual.

Dec 12, 2009 | 2002 Dodge Dakota Club Cab

1 Answer

4 lo working, 4 hi stopped working , A4WD never worked


Hi my name is Juan and I do own a trailblazer with the same year 2002 and I read the problem you have let me try to help you Have you try to shift to 4hi with your transmission in neutral ? the transmission needs to be in neutral in order to shift the transfer case to 4hi and the vehicle needs to be completely stooped also is your service 4wd light on?? if the light is on your transfer case needs service and it can be as simple as the switch inside your car or a solenoid that has not been detected by the computer

Mar 30, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

96 chevy 4x4. no ind lights. stuck in 4hi


Replace the selector switch assembly. Common failures.

Mar 27, 2009 | 1999 Chevrolet Silverado 1500

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