Question about 1999 Chevrolet Blazer

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CAN'T GET 99 BLAZER IN 4 WHEEL HI

No noise or excitement, but indicator lamp just blinks on 4hi but doesnt engage. Never leaves 2WD.

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  • cloudy915 Dec 27, 2008

    Didnt try 4LO , but it didnt go in Auto 4WD either, just blinking indicator light while not leaving 2WD.

  • mikehumble May 11, 2010

    Will it go into 4LO?

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  • Contributor
  • 47 Answers

It sounds like a bad encoder motor on the transfer case. This was a very common problem with the S series trucks. Unfortunatly it is not a cheap fix. You will be looking at around $450 - $550 to have it fixed, more if at a dealer. Hope this helps.

Posted on Jan 03, 2009

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Posted on Jan 02, 2017

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Related Questions:

1 Answer

How do I fix my 99 blazer the dome lights won't turn on and the 4 who drive won't light up or work


In the instrument panel fuse box fuse # 8 CTSY LP 10A ,that's for the dome lights, fuse panel is left side of IP. What are you talking about 4 who drive won't light up or work ? 4 wheel drive ? Do you have two speed automatic or two speed selectable ?
Switch Indicator Lamps Do Not Light - One or More ? Check fuse #15 IP fuse box 10A 4WD . This is for two speed auto !

Circuit Description

The indicator lamps circuits consist of 5 individual lamps contained inside the mode/range switch assembly, they are AUTO, 4WD, 2HI, 4HI, 4LO and NEUTRAL. The AUTO, 4WD, 2HI, 4HI, and 4LO lamps are contained inside their respective range button. When the ignition is ON, the transfer case shift control module illuminates the indicator lamp that corresponds to the current ATC gear position by providing a ground through a current limiting driver.
The transfer case shift control module flashes each indicator lamp after a shift has been requested and will continue to flash until the transfer case shift control module can complete the shift. After a shift to AUTO, 4WD, 2HI, 4HI, or 4LO is made, the transfer case shift control module will flash that indicator lamp until the transfer case shift control module receives a high voltage signal on CKT 1695 from the front axle switch.
A solid state circuit located inside the switch supplies ignition voltage to the lamps. The solid state circuit also receives voltage whenever the headlamp switch is in park or headlamp position. When the solid state circuit receives voltage from the headlamp switch it will reduce the voltage that it supplies to the indicator lamps, dimming the lamps when the headlamps are ON.

Feb 07, 2015 | Cars & Trucks

1 Answer

My 1998 Chevy Blazer is stuck in 4hi. It WILL switch to 4Lo, but it will not switch back to 2wd. Any ideas of what might be wrong and how to fix it?


there is a electrical actuator on the transfere case that controls when you put in 4 wheel hi or 4 wheel lo and 2 wheel

Dec 29, 2012 | 1998 Chevrolet Blazer

1 Answer

I have an 2004 chevy blazer 4x4 and the four wheel drive does not engage on the fly and it also will not engage when in neutral. Four wheel low will work but when you press 4 wheel hi it blinks twice and...


Which of these does your vehicle have ?
The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel.
The NVG 236 transfer case features a 4 button shift control switch located on the instrument panel.
Do you know what DTC'S - diagnostic trouble codes are ? Both of these 4X4 systems can set DTC'S , Having a professional or factory scanner is what is needed to check for these codes . Not a OBD 2 code reader or autozone , advance etc... The four button system can set a bunch of them .
DTC B2725
DTC C0300
DTC C0305
DTC C0308
DTC C0309
DTC C0310
DTC C0315
DTC C0323
DTC C0324
DTC C0327
DTC C0362
DTC C0367
DTC C0374
DTC C0376
DTC C0387
DTC C0550
DTC C0611

The NVG 233 transfer case features a 3 button shift control switch, located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module starts monitoring the transfer case shift control switch, to determine if a new mode/gear position has been selected. At a single press of the transfer case shift control switch, the lamp of the new position begins flashing to inform the driver that the transfer case shift control module 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 reached, or has engaged. Once the new mode/gear position is fully active, the switch indicator lamp for the new position remains ON constantly.
The NVG 233 transfer case provides the driver with 3 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
Any of these mode/gear positions may be selected while driving the vehicle. However, the transfer case will not allow a shift into, or out of, 4LO unless the following criteria has been met:
• The engine is running.
• The automatic transmission is in Neutral, or the clutch pedal is applied on manual transmissions.
• The vehicle speed is below 5 km/h (3 mph).


Finding out what if any codes are stored should be your first step .

Feb 22, 2018 | 2001 Chevrolet Blazer

1 Answer

4hi is not working


try seeing if the cable going to the front differental is pulling in to engage the front axle?

Apr 24, 2009 | 1993 Chevrolet S-10 Blazer

2 Answers

BLAZER 4X4 HI LITES UP BUT THEN GOES BACK TO 2WD, 4WDHI WORKS


My 4by4 doesn't engage,both lights 4hi and 4low blink for few seconds and then goes back to 2wd and that's it, won't engage 4wd...what should I do?

Jan 08, 2009 | 1999 Chevrolet Blazer

3 Answers

I just bought a 2001 blazer 4.3 4wd and it was stuck in 4 low


It should tell you on the Shifter whether or not that you can Shift on the Fly. Check the Manual first if there is one in the Truck. Some Models had this and some Did not. Was an Extra from Factory Option.

Dec 31, 2008 | 2001 Chevrolet Blazer

1 Answer

Will not switch between four wheel drive and two wheel drive.


DID YOU CHECK THE MOTOR IN THE FRONT AXLE AS WELL AS THE ONE IN THE TRANSFER CASE GOOD LUCK

Dec 31, 2008 | 1994 Chevrolet S-10 Blazer

1 Answer

My 98 chevy blazer won't shift into 4wd.


Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.

Dec 22, 2008 | 2000 Chevrolet Blazer

4 Answers

My 98 chevy blazer won't shift into 4wd.


Had the same problem, disconnected the battery for about fifteen minutes, reconnected, 4 wheel drive hi and lo work like a charm now.

Dec 14, 2008 | 1998 Chevrolet Blazer

1 Answer

Tranfer case does not shift into 4HI from 2WD


try resetting the 4X4 module first. Remove the courtesy lamp and ATC fuses for at least 1 minute the reinstall fuses. Cycle key on and off 5 times then try your four wheel. Please rate if this works.

Nov 20, 2008 | 2002 Chevrolet Blazer

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