Question about 2005 Chevrolet Avalanche

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Service 4wd displays on dash

I have a couple of friends with 05 Chevy Avalanches. they recently called me up regarding a problem with their 4wd.while driving the service 4wd drive will come on and then clear.We"re wondering if anyone else is having the same problem and what could this be. I know one of the guys his vehicle to the dealership and had an encoder motor or something replaced but it didnt resolve the problem. just thought we'd ask for a bit of knowledge on this matter.

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  • cbwhitty Mar 11, 2009

    I've had my Avalanche for 3 years, never had this code show up, took it to have the tires balanced and rotated at 96,000 miles. The "service 4wd" showed up as i drove away from the tire shop. Is there anything the tire shop could have done to cause this code to show up? Very suspicious coincidence.

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I had the service 4 wheel drive message come up on my dash. Then my 4x4 switch would stop working. It would lock me it 4 wheel drive. But if i shut off the truck and restart it would start working agian. So finally i had the truck scaned and they told me i needed a new 4x4 switch. so i bought mid february one and so far so good. I was told that the switch is a very comen problem. I hope this helps.

Posted on Apr 14, 2009

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Check Solenoid at tranny and Actuator switch. Take it to get a trouble code at parts store for free . Autozone, Kragen's Checker Auto, etc.

Posted on Jan 20, 2009

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Four wheel drive not working on 2002 chevy blazer


Is the SERVICE 4WD indicator lit ?
The SERVICE 4WD indicator is an integral part of the cluster and cannot be serviced separately. This lamp is used to inform the driver of the vehicle that a transfer case system malfunction. The SERVICE 4WD indicator is controlled by the transfer case shift control module via Class 2.
If so suggest you take it to a ASE certified repair shop !

Dec 15, 2015 | 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

2 Answers

I have a 1998 Chevy Tahoe with the service 4wd light on and cannot switch out of 4wd, can it still be driven and what could be the problem?


if its electric shift. its probly the shifter motor. start vehicle open the door listen 4 the shifter motor. 2 see if you can hear it trying 2 shift. if not thats what it is if you can hear it tryng 2 shift it mite be vacume lines

Feb 13, 2010 | 1998 Chevrolet Tahoe

1 Answer

2005 chevy cobalt check engine light on


i went to advance auto and they pulled the check engine light code and they said it was just wet electrical equipment from all the rain we have had and that it would dry out in a couple of drives so they reset the code and told me to come back in if it comes back on.

Apr 14, 2009 | 2005 Chevrolet Cobalt

2 Answers

4wd light says service


Does the 4-wheel drive work ? Most of the time, it is a reminder to have your fluid changed. Other times, it could be a vacuum leak in the line that engages the 4-wheel drive. Check both of those first.

Apr 04, 2009 | 1999 Chevrolet Tahoe

1 Answer

Four wheel drive in cold


It is due to the cold weather,The fluid is to thick when cold for the actuator to engage the 4wd.

Please rate this solution.

Jan 16, 2009 | 2007 Chevrolet Colorado (Extended Cab) New...

1 Answer

Loss 4WD drive while it was engaged


check your fuse box under the hood or in the cab on the drivers side,there is a fuse for the 4x4 or check the actuator that goes into your front diff the wire plug sometimes gets corroded and stops working.

Dec 19, 2008 | 1998 Chevrolet K1500

1 Answer

99 silverado 4wd went out... transfer case?


a little tip a friend gave me in unlocking the 4wd drive on ramps or hill and then put in neutral let roll back a foot put in park and then let off the 4wd
when in 4wd the hubs get a little heated cause they need greased so they stick into position making it hard to come out of 4wd this which i spoke of i got stuck in the senerio where i almost drove home in 4wd from 300 miles away but i called my friend he told me bought this and so i thought it could help you

your hubs just locked up on you your bearings are going to need to be packed again this is normal for this

hub

Nov 19, 2008 | 1999 Chevrolet Silverado 1500

3 Answers

4 wheel will not engage on 2002 DODGE DURANGO


you will need to let the durango sit in the nuetral position without moving, then turn the knob from 2WD to 4WD. if that doesnt work, try putting the durango in reverse and then back to drive a couple times. you may have some mud/dirt/oil caked up under there interfering with the 4WD moving parts.

Nov 17, 2008 | 2002 Dodge Durango

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