Question about 2002 Chevrolet TrailBlazer

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Trailblazer 2002, service 4x4 light is on dealer said replace

Transfer case control module and wants 500 bucks. We found a guy that had a damaged trailblazer and we bought the transfer case control module from him and the model number is identical. When we put it in the light for 2hi is on but doesn't do anything else. The service 4x4 light is no longer on either...does this need to be reprogrammed for my truck even though it is not new? Please help I was just trying to avoid the cost of a new module.

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2003 Trailblazer Transfer Case Control Module.

the t case control module is inside the vehical driver side its like a small computer that comunicates from the manual switch to the motor that engages 4wd thats on the t case. buy it install it and you have to get it reprogramed part is about 200-299 depends on where you shop and a reprogram is about 80 at a dealer

Posted on Dec 20, 2008

michigan man
  • 3533 Answers

SOURCE: i need a owners manual for chevrolet trailblazer 2003

www.edmonds.com for owners manuals on line

Posted on Mar 22, 2009

smartr10U
  • 1305 Answers

SOURCE: Replacing Chevy Trailblazer Spare tire mount/hoist.

Check out item 330335042615 on Ebay...
it''s the whole jack, handle etc... 50 bucks!
Tah dah!

Posted on Jun 09, 2009

cincinaty5
  • 132 Answers

SOURCE: 1993 chevy 1500 4x4 pickup no power to front actuator

check all wire conections also replace the actuator on the front axle but check for power there first if you have power replace that switch as well .

Posted on Aug 27, 2009

  • 56 Answers

SOURCE: 01 blazer-trailblazer, when switching from 2hi to

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

Posted on Jan 02, 2010

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Jan 08, 2016 | Cars & Trucks

2 Answers

My 4x4 is not engaging on my 2004 Chevy trailblazer, any ideas?


Assume for an instant that the transfer case is actually working. The next area to check is the hub actuators or that the front hubs are actually engaging to drive the wheels. Remember it requires both hubs to be locked in for the 4x4 to work or else if only one hub is locked then the front diff will work and all the drive will be to the wheel that is not locked in
The cost to check is really cheap. just jack the front off the ground and see if both wheels are engaged . Do this by placing in 4x4 and have a friend hold a wheel while you turn the other wheel or try to turn the other wheel. BY holding one wheel ,if the hubs are locked in then you will not be able to turn your wheel. Ensure that the transmission is in gear as if you are driving the vehicle.

Feb 10, 2015 | 2004 Chevrolet TrailBlazer

1 Answer

Found oil in vacum lines replaced some parts on trans blew out lines


Is this a 4x4? If so, vacuum switch on top of the transfer case and any HVAC parts that are damaged. That might be the part they replaced for you. Is there a hiss coming from the dash controls? If so, you will need to replace the mode switch with one from a junkyard. Otherwise you have to buy the whole control unit. I think it's about $65 bucks from Amazon. Probably $165 from the dealer. Here is some info on an older truck in the link. GMC Sonoma Chevy 10 Transfer Case Vacuum Switch

Jun 20, 2014 | 2002 Chevrolet S-10

1 Answer

4x4 Service Soon light is on


This will require a mechanic to diagnose, there many components to the 4x4 system (transfer case & encoder motor, transfer case control module, front drive disconnect & actuator). Any problem with these can illuminate the 4x4 Service light.

Dec 30, 2012 | 2002 Chevrolet TrailBlazer

1 Answer

Service four wheel drive light on,cant shift into 4wd cold only ,below 45F,drive awahile resatrt the truck it works fine,warm days no problems .


Vehicles: 2002 Chevrolet Trailblazer 4WD 4.2L SFI DOHC 6-cylinder

Your front 4WD Transfer case is low on Gear Oil.
On warm days, the Gear Oil expands slightly, and is less viscous, so the "Service 4WD" light stays off. On colder days/mornings the story changes.

The following paragraph has info applying to the manual differential only:
The 2002 Trailblazer (the first year Chevy made the Trailblazer) has a Front Differential using 1.11 (that's 1 and 1/9th) Quarts Gear Oil, and a Rear Differential with a capacity of 2.29 (thats 2 and 2/7ths) Quarts Gear Oil.
The Gear Oil needed is GM Part No.12345349 or GM Part No.1052931 (they're identical), also known as "GM Synchromesh"(R), which is a type of GLS (Gear Lubricant, Special), also known as "Manual Synchromesh Transmission Fluid 5W30". A synthetic version of which sells for $12.70/qt (USD) at
http://www.amsoil.com/storefront/mtf.aspx

This is not to be confused with 5W30 motor oil (which can be had for $3.00/qt (USD)).

The 2002 Trailblazer 4WD Transfer Case (NV126 Transfer Case) capacity is 0.8 Liters of GM Part No.12378508 (US), also known as "GM Auto Trak II"(R).
Note that one Quart (US) = 0.946 Liter, so 0.8 Liter = 27.06 ounces.

Red Line sells something that they say replaces both GM Synchromesh and GM Auto-Trak II for $12.14/Qt and $44.55/Gal (US) at
http://www.shopwiki.com/Red-Line-MTL-70W80-GL~4-Gear-Oil-%281-Quart%29

13 Manufacturer Recalls apply to the 2002 Chevrolet Trailblazer (model year 2002 was the first year Chevy offered the Trailblazer), and two recalls pertain to the 4WD Transfer Case. Note that one of the recalls applies to only 895 units, so your vehicle is unlikely to be affected by this Transfer Case recall.

2002 Trailblazer Recall ==========================
OCT 17, 2001 ' Recall ID# 54221

Recall Reason POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
Recall Date OCT 17, 2001
Model Affected TRAILBLAZER
Potential Units Affected 78004

Recall Summary
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES EQUIPPED WITH 4-WHEEL DRIVE. THE CALIBRATION OF THE TRANSFER CASE CONTROL MODULE COULD CAUSE INSUFFICIENT HIGH SPEED GEAR ENGAGEMENT.

Consequence
IF THE GEAR IS NOT ENGAGED, THE VEHICLE CAN ROLL WHEN THE TRANSMISSION IS IN "PARK" AND A CRASH COULD RESULT WITHOUT WARNING.

Remedy
DEALERS WILL UPDATE THE TRANSFER CASE CONTROL MODULE CALIBRATION TO INCREASE GEAR ENGAGEMENT. OWNER NOTIFICATION BEGAN NOVEMBER 6, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.

Notes
GENERAL MOTORS CORP. 01064/01065

2002 Trailblazer Recall ============================
SEP 05, 2001 ' Recall ID# 26006

Recall Reason POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)
Recall Date SEP 05, 2001
Model Affected TRAILBLAZER
Potential Units Affected 895

Recall Summary
VEHICLE DESCRIPTION: SPORT UTILITY VEHICLES (4 WHEEL-DRIVE). SOME OF THESE VEHICLES WERE BUILT WITH A RANGE SHIFT COLLAR IN THE TRANSMISSION TRANSFER CASE THAT CONTAINS CRACKS.

Consequence
THIS CONDITION COULD RESULT IN A COMPLETE FRACTURE OF THE RANGE SHIFT COLLAR AND SUBSEQUENT LOSS OF VEHICLE FORWARD AND REVERSE GEARS, AND THE INABILITY TO MAINTAIN "PARK" POSITION. THIS INCREASES THE RISK OF A VEHICLE CRASH RESULTING FROM UNINTENDED MOVEMENT OF A PARKED VEHICLE.

Remedy
DEALERS WILL REPLACE THE TRANSFER CASES AND UPDATE THE CONTROL MODULE CALIBRATION. OWNER NOTIFICATION BEGAN SEPTEMBER 6, 2001. OWNERS WHO TAKE THEIR VEHICLES TO AN AUTHORIZED DEALER ON AN AGREED UPON SERVICE DATE AND DO NOT RECEIVE THE FREE REMEDY WITHIN A REASONABLE TIME SHOULD CONTACT CHEVROLET AT 1-800-222-1020 OR GMC AT 1-800-462-8782.

Notes
GENERAL MOTORS CORP. 01061


Read about all (13) 2002 Chevy Trailblazer recalls at:
http://www.internetautoguide.com/10-12-2002-16-1287/2002-chevrolet-trailblazer-recalls.html

Dec 05, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

Service 4x4 light is on


You will need to get the codes from the Transfer Case Control Module.This will aid in finding the cause of why your light is coming on.You will need to find someone with a scan tool.If you get the codes you can post back and I`ll be happy to help you out.Good luck.

Mar 12, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

No lights on switch to switch to 4x4 and serves 4x4 light is on


First check the 4WD fuse in fuse panel. If blown you will most likely need a TCCM (transfer case control module). They were known to cause issues especially for 2002 models.

Feb 06, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

04 Trailblazer LS won't go into 4WD. Front hubs don't engage with switch in cab. It will gear down to 4wd Lo but front wheels won't engage. Please help. Can't afford the dealer!


What do the lights on the 4x4 selector switch do when you switch to A4WD or $HI or 4LO positions? Do they blink and revert to previous selection? Has the Transfer Case fluid been changed at 50K intervals?
There are actuators on the Transfer Case and Front Differential that control the application of power to the front wheels. These actuators are controlled by the TCCM (Transfer Case Control Module). It takes a qualified 4 wheel drive technician to diagnose these systems.

Jan 09, 2011 | 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

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

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