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Where is encoder motor at on transfer case of 2004 s10 zr5

Stuck in 4hi

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Posted on Jan 02, 2017

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SOURCE: my 99 silverado is stuck in 4hi

COULD BE CONTROL MODULE OR WIRING PROBLEM,BAD GROUND.RUN CODES IT SHOULD TELL YOU SINCE EVERY TIME YOU START IT RUNS DIAGNOSTICS

Posted on Dec 21, 2008

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SOURCE: s10 pickup 4wheel drive wont shift from 4hi to 2hi

Mine is on the front drivers side, is yours? I just about fell over when I discovered who they designed it!

Posted on Jan 01, 2009

  • 2 Answers

SOURCE: I have a 98 GMC Sierra and the 4wd buttons were

Ok, I fixed it. I just reset the computer by taking the pos and neg cables off the battery and after 15 secs touching the two together. Now everything works fine.

Posted on Dec 31, 2009

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1 Answer

Transfcase motor not shifting


Have you had it check for DTC's - diagnostic trouble codes . frustrating because you don't know what your doing. Rookies ! I'd tell you have to test but you don't have tool or knowledge .
What transfer case does your tahoe have ?
Do you know what DTC'S are ? Your vehicle 4X4 can set a bunch .

DTC B0770
DTC B0775
DTC B0780
DTC B0785
DTC B0790
DTC B2725
DTC C0300
DTC C0305
DTC C0306
DTC C0321
DTC C0326
DTC C0327
DTC C0359
DTC C0374
DTC C0378
DTC C0379
DTC C0550
DTC C0558

DTC B0775 Four Wheel Drive High Range (4HI) Indicator Circuit Malfunction

DTC B0780 Four Wheel Drive Low Range (4LO) Indicator Circuit Malfunction
DTC B0785 Two Wheel Drive High Range (2HI) Indicator Circuit Malfunction
DTC B0790 Transfer Case Neutral Indicator Circuit Malfunction

DTC B2725 ATC Mode Switch Circuit Malfunction

DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
Just show a few DTC'S and for everyone of these DTC'S is a diagnostic flow chart . Do you know what that is ? It's fustrating and hard to fix something when you don't have a clue as to what your doing . Do you know how to do basic automotive electrical testing ?

This would sound about what the problem could be , but with out testing id be guessing just like you .

DTC C0306 05: Motor A or B Circuit Short to Battery or Open
DTC C0306 02: Motor A or B Circuit Short to Ground
DTC C0321 01: Transfer Case Lock Short to Battery
DTC C0321 06: Transfer Case Lock Short to Ground or Open

Do yourself a favor and save some aggravation an take it to a qualified repair shop . You do know a computer controls the 4X4 system ? transfer case shift control module .

Feb 18, 2017 | 2007 Chevrolet Chevrolet Tahoe LTZ

1 Answer

4 wheel drive won't engage


Which do you have ?
Transfer Case - NVG 236 (Two Speed Automatic)
Transfer Case - NVG 233-NP1 (Two Speed Selectable)
The NV236 transfer case is an automatic transfer case with three drive ranges. Shifting from rear wheel drive to four wheel drive is done automatically when the transfer case shift control module receives wheel rotating slip information from the speed sensors. The transfer case shift control module then engages the transfer case motor/encoder to position the transfer case from rear to four wheel drive. When the transfer case shift control module receives information that the wheel rotation is the same on both axles, the transfer case shift control module sends position information to the motor/encoder to put the transfer case back into rear wheel drive. The three drive ranges are 2HI, 4HI, and 4LO. The 2HI position is for normal driving with the rear wheels pushing the vehicle. The 4HI, position is for driving through sand, snow, mud, gravel, or heavy rain at normal or slightly below normal speeds. The 4HI engages the front axle to allow for four wheel drive. The front axle is pulling the vehicle, and the rear axle is pushing the vehicle. The 4LO range is used for off road driving, heavy snow, deep mud, or shallow fording. The 4LO is similar to the 4HI except that the gearing in the transfer case is set for low speed and high torque. The NV236 is manufactured at Syracuse New York by New Venture Gear a division of New Process Gear for General Motors.
Is the switch light on or flashing ? If you have automatic 4x4 there are several DTC'S that can set >
DTC B2725 ATC Mode Switch Circuit Malfunction DTC C0300 Rear Speed Sensor Malfunction DTC C0305 Front Speed Sensor Malfunction DTC C0308 Motor A/B Circuit Low DTC C0309 Motor A/B Circuit High DTC C0310 Motor A/B Circuit Open DTC C0315 Motor Ground Circuit Open DTC C0323 T-Case Lock Circuit Low DTC C0324 T-Case Lock Circuit High DTC C0327 Encoder Circuit Malfunction DTC C0362 4LO Discrete Output Circuit High DTC C0367 Front Axle Control Circuit High DTC C0374 General System Malfunction DTC C0376 Front/Rear Shaft Speed Mismatch DTC C0387 Unable to Perform Shift DTC C0550 ECU Malfunction DTC C0611 VIN Information Error

Dec 01, 2015 | 2000 Chevrolet S-10

1 Answer

Shifting 4x4 4lo


Most likely cause is the encoder motor on the transfer case.

Oct 26, 2013 | 2002 Chevrolet Silverado 1500

2 Answers

My 2003 S10 ZR5 is stuck in 4 wheel drive. The 4 HI light is illuminated and it will not switch back to 2 HI or to 4 LO.


Try reversing the vehicle at various speeds to get the selector to disengage, if not jack the vehicle up with all four wheels off the ground, and slowly engage first and reverse, trying to get it to jump out of four wheel drive. Their maybe a lot of transmission wind up, especially if it has been driven on tarmac, but hopefully not a lot of damage.

Jan 24, 2011 | 2003 Chevrolet S-10

1 Answer

My 1999 suburban also stuck in 4 wheel. when i push the button to go into 2 hi it flashes the acuator pulls in then goes back into 4 hi. it wont stay in 2 wheel drive. i have replaces the control on the...


Did you ever think of having it diagnosed by a qualified repair shop ? Thier are aspects associated with this system you have no clue about. That's the first thing every one goes for , changing the switch . It flashes because codes are stored .
DTC B0768 Service Indicator Circuit High
DTC B2725 ATC Mode Switch Circuit Malfunction
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0323 T-Case Lock Circuit Low
DTC C0324 T-Case Lock Circuit High
DTC C0327 Encoder Circuit Malfunction
DTC C0357 Park Switch Circuit High
DTC C0362 4LO Discrete Output Circuit High
DTC C0367 Front Axle Control Circuit High
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0387 Unable to Perform Shift
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error
You need a professional scan tool to check for these codes an too view data parameters .
Transfer Case Shift Control Module
The transfer case shift control module uses the VIN information for calculations that are required for the different calibrations used based on axle ratio, transmission, tire size, and engine. The system does not know which calibration to use without this information.
The direct battery supply line (CKT 1640) provides the power to the module and motor circuitry.
Transfer Case Encoder Motor
The transfer case encoder motor consists of a permanent magnet (PM) DC motor and gear reduction assembly. It is located on the left hand side (drivers side) of the transfer case. When activated it turns the sector shaft of the transfer case (clockwise or counter clockwise) to shift the transfer case. The encoder motor is controlled with a pulse width modulated (PWM) circuit within the transfer case shift control module. This circuit consists of a driver on both the Motor A and Motor B circuits. The encoder motor is bi-directional to allow the motor to shift the transfer case from 2HI or 4HI to neutral and 4LO positions.
Transfer Case Encoder
Your best bet ,take it to a qualified repair shop .

Jul 18, 2017 | 1999 Chevrolet Suburban

1 Answer

I have a 98 GMC Sierra and the 4wd buttons were all screwed up so I bought the transfer case encoder motor and now my 2wd and 4low works fine, but when I push the 4hi nothing happens. If truck is in 4low...


Ok, I fixed it. I just reset the computer by taking the pos and neg cables off the battery and after 15 secs touching the two together. Now everything works fine.

Dec 30, 2009 | 1999 Chevrolet Tahoe

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

4 Answers

2001 s10 pickup transfer case wont go out of 4lo


something has broke inside the transfer case keeping it from going into any other gear

Jan 03, 2009 | 1999 Chevrolet S-10 Pickup

2 Answers

S10 pickup 4wheel drive wont shift from 4hi to 2hi


A good ground is very imporant on these vehicles

Dec 31, 2008 | 2000 Chevrolet Blazer

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