Question about 2002 Chevrolet Blazer

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Tranfer case does not shift into 4HI from 2WD

Previously able to shift into 4HI by manual procedure - no longer to do even that. Transfer case will shift into 4LO. Owners manual says the transmission indicator switch may require adjustment - how is this done?

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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.

Posted on Dec 04, 2008

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Posted on Jan 02, 2017

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2 Answers

2004 gmc envoy 4wd issues, can only go into 2wd and 4 low? what might be causing this or what should I replace?


Without hooking up a factory or professional scan tool an checking for DTC'S - diagnostic trouble code's . And or going through other diagnostic procedures for Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode an other diagnostic testing procedures ,you should not replace anything . You best bet ,take it to a qualified repair shop. Do you know what DTC'S are ? What an electronic control module is ?
The transfer case brake control is supplied voltage at all times, with the key ON, through the B+ circuit. The brake control is activated when the transfer case shift control module registers the following modes:
• AUTO FWD
• 4HI
• 4LO
This is accomplished when the transfer case shift control module provides ground to the brake control through the T-Case Lock circuit. If there is a fault in the brake control circuit, the transfer case shift control module goes into a shift block mode. The shift block mode causes the mode indicator to flash for 10 seconds when another mode is selected. After the 10 second period has ended, the indicator reverts back to the previous mode selection.

DTC B0770
DTC B0775
DTC B0780
DTC B0785
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0327
DTC C0359
DTC C0374
DTC C0379
DTC C0550

Without proper diagnostic tool's an factory service repair information an knowledge how it work's , very doubtful you could fix these , or should you try .

Jan 06, 2018 | GMC Cars & Trucks

1 Answer

My 1997 GMC Sierra lights for 4hi and 4lo blink when i push the 4hi button and then goes back into 2hi. but when i push 4lo it locks in and works fine. I tried changing the 4wd motor on the transfer c


THE TRANSFER CASE MOTOR IS ONLY FOR 4WD LOW. That would have never been the problem as soon as you confirmed it shifted into 4wd Low. 2wd and 4 Hi work off of vacuum. You may have one or two issues. A vacuum leak up by the front axle that engages the 4wd HI or the sensors on the transfer case.

Nov 22, 2013 | 1997 GMC Sierra

1 Answer

My 99 silverado 4x4 is stuck in 4LO. When I push 2wd, 4wd auto or 4HI it cycles through and returns to 4LO. I have replaced the shift module behind the dash, switch on the dash, transfer case shift motor...


You have to put the truck in neutral first then switch the 4hi and don't use the auto select. If it still won't switch you may have damaged the servo and need to replace it. Or worse damaged the transfer case. So try in neutral first and hope that works.

Feb 07, 2018 | Cars & Trucks

1 Answer

1999 Chevy Suburban stuck in 4wd


Hi Dale, Sometimes the front diff becomes wound up. I am not saying this is the problem with your vehicle but what I'm about to suggest may work as it often does with other four by fours. Make sure you have a clear space to drive the vehicle backwards and forwards at a slow speed. As you do so select the two high position on the selector. You may need to reverse and go forward several times. Hope it works for you. Regards John

Aug 21, 2012 | 1999 Chevrolet Suburban

1 Answer

Car is stuck in 4wd low HELP!!!


Vehicles built After Jan 2002 may have Electronically Controlled Shift Mechanism. In the sorento's there are the switch knob eitheir if this one the auto or manual . If your Transfer case is difficult to shift or will not shift into desired range. 1) Transfer case electronically controlled shift system malfunction. 2) If vehicle was operated for an extended period in 4HI mode on dry surface, driveline torque load may cause difficulty. Drive the vehicle in a straight line and momentarily release the accelerator. The transfer case can then be shifted to the desired mode. 3) Insufficient or incorrect lubricant. 4) Internal transfer case components binding, worn, or damaged. Other possible causes are; Different Sized Tires; Charging System Diagnostic Codes; Transfer Case Control Module; INTERMITTENT WIRING AND CONNECTORS; Transfer Case Selector Switch; Transfer Case Mode Sensor; Mode Select Circuit open/shorted. At this moment, try putting it in nuetral and shifting your knob to the auto (ex models) or 2wd (lx) and see if it's click into your position, if not, check out your owners manual and follow steps. If you still can't get it unstuck, could be fuse relay or fuse that malfuctioned your control shift system, or simply the above mentioned. Would recommend you taking it in to your dealship to have them see what is causing the promblem.

Jan 28, 2011 | 2004 Kia Sorento

1 Answer

2001 Dakota: four wheel drive will not engage and windshield wi...


4x4 issue could be either the TCCM Transfer Case Control Module, or the transfer case shift motor.

When you turn your dash switch from 2wd to 4HI, can you hear the shift motor underneath operating?

May 17, 2010 | 2001 Dodge Dakota

1 Answer

02 dakota wont shift from 4hi to 2 hi


Try commanding the drive ranges while in netural cycling them. This may normalize the controller that senses the position from the encoder motor assembly. There maybe a procedure for that in a service manual.

Dec 12, 2009 | 2002 Dodge Dakota Club Cab

1 Answer

Transfer case oil


the transfer case uses the same ATF as the trans.

May 30, 2009 | 1999 GMC Jimmy

1 Answer

Will not shift into 4HI


These have a problem with grounds, i run a ground from my frame to transfer case

Dec 28, 2008 | 2000 Chevrolet Blazer

1 Answer

Can't transfer to 4L or neutral mode


Transfer cases can be quirky. I've got a 91 Wrangler, an 86 Cherokee and a 75 Blazer. When I go from 2WD to 4WD, they each have their own personality.

There are a number of things I've learned to persuade a stubborn xfer case to shift.

Try mixing these :
  • Engine running, vehicle not moving
  • Engine off, Shift Xfer case, Restart
  • Tranny in neutral
  • Shift Xfer case 'N', Tranny in gear, Tranny in neutral, Xfer case to 4HI or 4LOW (as long as you feel it register), Tranny in gear, try to move
  • Shift Tranny to Reverse, roll a few yards
  • Lock/Unlock the Hubs
To get back to 2WD:
  • Drive for a few feet in a straight line
  • Unlock the hubs
  • Tranny Neutral
  • Shift xfer case
Let me know how it turns out.
Mike

Jul 27, 2008 | 1991 Jeep Wrangler

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