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I have a 2007 trailblazer with 50,000 miles. On colder days like today was my service 4wd light was on. Once I drive a little while and restart the vehicle, it goes off and works fine. I already had the controll module replaced and the transfer case switch replaced. I'm out of ideas and the dealer can't seem to figure it out either. The only other idea is that the transfer case fluid Is low. Any suggestions would be greatly appreciated.

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  • 54 Answers

Checking the fluid would be a good place to start

Posted on Oct 13, 2013

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Posted on Jan 02, 2017

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SOURCE: service 4wd switch

I have the same problem the switch is on the transfer case! what your talking about is your vehicale information center. the stupid thing sucks I also replaced it but it only comes on some times now. dont know!

Posted on Sep 12, 2008

  • 1118 Answers

SOURCE: Is differential & transfer case flush good idea at 95,600 miles?

You should have the trans., transfer, and diff. serviced, if you got an owners manual it will tell you in there at what intervals or the milage it should be done at,mostly around 35 to 50.000 you got that kind of milage on it and its never been done you better do it, the oils do break down and don't last forever, it could cost you more in the long run.

Posted on Aug 11, 2009

  • 6 Answers

SOURCE: 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.

Posted on Oct 24, 2009

  • 474 Answers

SOURCE: 2002 Ford Explorer 4WD. 4WD is inopertive.

put a ground strap from your transfer case to your transmission. also with someone listening under the car with the key on but not running put your foot on the brake, shift to neutral and turn the selecter to 4x4 low and see if you can hear the actuater respond

Posted on Dec 19, 2009

  • 1374 Answers

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

Posted on Mar 09, 2010

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1 Answer

Service 4WD has come on twice, two winters in a row.


Its your control module for the 4 WD on the transfer case hanging. They go bad often. I would replace

Jan 11, 2015 | 2003 Chevrolet TrailBlazer

1 Answer

Outlander2009...on dashboard appeare service reuiered with appearance of 4wd alternating with lock !


Service Required dash lights are usually preprogrammed to come on at 50,000 miles intervals. If nothing is wrong with vehicle, check under the dash for a switch that can be pushed to the other side which will reset it for the next 50,000 miles.

Aug 16, 2013 | 2007 Mitsubishi Outlander LS

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

How do u service the 4wd on a chevy trailblazer


It all depends on what is wrong, I assume the service 4x4 light came on in your dash. These conditions require a qualified technician, using a scan tool to determine where the problem is. The 4x4 system is not that complicated but there are electronics and electro-mechanical controls involved that require certain knowledge to diagnose.
Also, very important on these vehicle, the transfer case fluid needs to be changed every 50,000 miles.

Sep 12, 2011 | 2004 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

2 Answers

We have a 1998 ford expedition V8 4WD, 131K miles.Problem = when backing out of garage and going down drive (we have an incline and must turn wheel to the left) the rear end of the car makes a thunking...


this can be caused by excessive play in the drive axle button ends inside the differential, you can confirm this by putting the truck on a lift and pulling and pushing in and out on the tires, if there is more than a little movement the axles are worn out at the retainer "C" clips inside the diff.

Jul 09, 2009 | 1998 Ford Expedition

1 Answer

50,000 mile service


48,000 miles or 48 months
Maintenance Service Schedule 2007 dodge
Change engine oil and engine oil filter
Rotate tires
Lubricate drivetrain / steering / suspension
grease fittings (if equipped)-except Powerwagon
Lubricate front drive shaft fitting
(2500 / 3500, 4X4 & Powewagon)
Lubricate tie rod end links - Powerwagon
Check automatic transmission fluid level
Check manual transmission fluid level
Check the coolant level, hoses and clamps
Inspect exhaust system
Inspect brake hoses and brake linings
Inspect the CV joints/U-joints (if equipped) and
front suspension components
Check spare tire for proper pressure & correct
stowage
Lubricate outer tie rod ends 2500/3500 4X4

51,000 miles or 51 months
Maintenance Service Schedule
Change engine oil and engine oil filter
Lubricate drivetrain / steering / suspension
grease fittings (if equipped)-except Powerwagon
Lubricate front drive shaft fitting
(2500/3500, 4X4 & Powerwagon)
Lubricate tie rod end links - Powerwagon
Check automatic transmission fluid level
Check manual transmission fluid level
Check the coolant level, hoses and clamps
Inspect exhaust system
Inspect brake hoses
Inspect the CV joints/U-joints (if equipped) and
front suspension components

Jan 04, 2009 | 2007 Dodge Ram Truck

4 Answers

Service 4WD LIGHT IS ON


I have a 2002 chevy trailblazer LT 4.2 l w/ approx 85000 miles on it and I left key in car after rolling down windows for about 2 hours drainging battery. After charging battery and running car for a little bit the service 4 wheel drive light came on. I have had no problems with the truck and I am wondering if it is because the battery was drained and the computer needs to be reset or something?

Oct 17, 2008 | 1999 Chevrolet Silverado 1500

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