Question about 1999 Chevrolet Blazer

1 Answer

My transfer case is permanently engaged but no 4 wheel drive...

It first started with the service 4 wheel drive light flashing along with the electronic panel flashing. wile the lights on the electronic panel were on I could not put my blazer into 4 wheel drive. also when the panel was lite I would hear a grinding sort of sound. I have had my father who is a mechanic look at it briefly, but we could not figure it out... the transfer case is locked into 4 wheel drive but I cant get the front tires to turn.

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 47 Answers

2 common problems that cause this are the vacuum switch on the transfer case and the vacuum actuator mounted under the battery tray. When the switch on the transfer case goes bad it pulls fluid out of the transfer case and pumps it into the actuator and destroys it. The switch only costs about $15 and are usually stocked at major auto parts stores. The actuator ranges from about $50 to $120 and most of the time need to be ordered. If you reach under the battery tray with the 4wd engaged and follow the cable you will feel the end of the actuator, make sure that it is pulling back. If not either the switch or actuator or both are bad. Hope this helps.

Posted on Jan 08, 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 expert 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 repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

2003 Silverado 4WD. Service 4WD dash light comes on after engaging 4WD and acts up by engaging itself randomly for several days, then goes back to normal.

Check connection at the 4X4 control module , check power and grounds . Do you know how to do basic electrical testing ? Does your truck have manual or automatic trans mission ? Which transfer case does yours have ?

The NVG 263 transfer case features a three button shift control switch located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module (TCCM) starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position begins flashing to inform the driver that the TCCM has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been engaged. Once the new mode/gear position is fully active, the switch indicator for the new position remains ON constantly. In the event that the TCCM can not or will not complete the shift, the indicator returns to the previously selected position; this is a Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode condition.

The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
• Neutral
Have it check for DTC'S - diagnostic trouble codes ?

DTC B0790
DTC B2725
DTC C0306
DTC C0327
DTC C0359
DTC C0379
DTC C0550

Your best bet would be take it to a qualified repair SHOP

Dec 28, 2016 | Cars & Trucks

2 Answers

4 wheel drive will not engage it says service 4 wheel drive how do i service the 4 wheel drive

First and foremost it depends on the make and model of the vehicle along with what style of 4 wheel drive. Once I have all that I can properly advise you on what to do

Feb 12, 2015 | 2000 Chevrolet Blazer

1 Answer

4-Wheel Drive

More than likely it is the switch alot of electric 4-wheel drive switches have been known to go bad from lack of use

Jan 26, 2014 | 2004 Chevrolet TrailBlazer

1 Answer

2002 Silverado 1500 push button 4 wheel drive issue Light will light showing it is in 4 wheel drive but it is not. Auto button seems to work though.

2 speed electric shift transfer case problems #1 jack up truck place on 4 jack stands. Start and select 4 high position in drive release brake ad watch front driveshaft does it turn "yes" problem is axle actuator on passenger side of differential not engaging axle shaft. "no" apply brakes bring to a stop engage low range does low range work "yes" internal transfer case problems "no" electric transfer case shifting motor failure.

Oct 26, 2013 | 2002 Chevrolet Silverado 1500

1 Answer

My 2007 2500HD Duramax 4 wheel drive Hi or Lo doesn't engage. The "Service 4 wheel drive" light comes on. No noises when trying to engage. Replaced the actuator, but no difference. Also sometimes when

The service 4x4 light coming on indicates problem with the system an DTC'S - diagnostic trouble codes are stored . Before replacing parts have a qualified repair shop do diagnostic's . ! Guessing an replacing parts on electronically controlled systems never fixes cars.
Do you know what DTC'S are ?
DTC B0775
DTC B0780
DTC B0785
DTC B0790
DTC B2725
DTC C0306
DTC C0379
DTC C0387
DTC C0396
DTC C0550
DTC C0569
DTC C0896
DTC P2160 or P2161
Which transfer case does it have ?
Transfer Case - BW 4485-NR3
Transfer Case - MP 1222/1225/1226-NQG
Transfer Case - MP 1625/1626-NQF
Transfer Case - MP 3023-NQH
Transfer Case - NVG 261-NP2

Sep 02, 2017 | Cars & Trucks

1 Answer

I have a 1992 toyota pickup 4x4 2.4 manual trans that trys to engage into 4 wheel drive on its one and whene i want it to it wont go in 4 wheel drive. I ALSO NOTICED that the 4x4 indercator light will...

G'day mate yes you have a prob and i think it is empty 'transfer' case Toyota had a big prob with transfer case pushing oil into gearbox , result transfer case empty gearbox full. fix is when you get the transfer case off (maybe have stripped and checked ) then drill a small hole in the front of the transfercase at gearbox filler bung height and run the same oil in both if its a manual that is. hope this helps

Apr 04, 2010 | 1992 Toyota Pickup

1 Answer

When you start the car the 4 wheel high and 4 wheel low indicators light and flash four times,

To make the lights stop blinking and actually engage the transfer case you have to maintain the electric motor that engauges the transfer case. the contact points inside get worn and corroded and wont allow enough power through to rotate the servo. The motor is located on the transfer case and is held of by 3 bolts, remove and unplug. Any good 4-wheel drive shop can fix it for you for about $50 or you can take it apart and clean the contact points inside and relubricate it yourself in about 15 minutes. reinstall and your 4 wheel drive will stop flashing and actually work.

Feb 07, 2010 | 2003 Ford Expedition

1 Answer

I have a 96 Explorer and I just tried to use my 4 wheel drive for the first time this year. Right away it seemed to drive "heavy" and eventually the 4WD and 4WDLOW light both started to flash......

When the lights flashed the system was telling u a fault has occured in the transfer case engagement actuator, most likely the motor or the mechanism it operates stuck, have you ever serviced the transfer case? I would do so, that will most likely cure the problem.

Dec 02, 2008 | Ford Explorer Cars & Trucks

1 Answer

When you press the shift on the fly button s on the dash for 4 wheel drive the light keeps flashing but after 2 or 3 flashes it is suppose to stop. It seem like the 4 wheel drive isn't fully engaging.

If the light is continuing to flash the 4X4 is not engaged, most likely the motor that engages it on the transfer case is either stuck or defective.

Nov 28, 2008 | GMC Canyon Cars & Trucks

Not finding what you are looking for?
1999 Chevrolet Blazer Logo

286 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts


Level 3 Expert

77932 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22306 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