Question about 2003 GMC Sierra 2500HD

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Encoder motor for the 4 wheel drive where is it

Encoder motor for the 4 wheel drive where is it located

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Hi, Its located under the transfer case. The long black plastic cylinder.

Posted on Aug 25, 2010

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1 Answer

Encoder location


Should be the motor attached to the transfer case.

Aug 21, 2012 | 2004 Chevrolet TrailBlazer

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Stuck in 4wheel drive how can I get it back to 2 wheel?


Try tapping the encoder motor with a hammer while a helper pushes the 2 high button. The encoder motor is the part on the transfer case that switches through the different drive options.

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My truck was engaged into 4 wheel drive lo and now it will not engage into anything else. It is a 2004 silverado with push button 4 wheel drive.need to know where my acuator and module is located to see if...


Your transfer case encoder motor [the thing that shifts the transfer case] is located on the LH side of the transfer case. I believe the control module should be located behind the dash near the light switch area.
If it stays in 4-Lo and the push button indicator just flashes for a while when you select, say, 2 Hi then stops blinking and goes back to the 4-Lo position then I would have someone hook up and check to see what service codes are present. I see a lot of encoder position sensors go bad but you really need a scan tool hooked up to the system to be able to watch what is happening as the shift is attempted. There aren't any vacuum controls on this system.
Hope this helps you out a bit!

Nov 28, 2010 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

2004 silverado 4 wheel drive does not work, 4 wheel high button remains lit, will not change to any other button


1. Inspect Transfer Case Control Module (TCCM) and encoder/motor wiring, terminal contact, grounds.

2. Install updated TCCM calibration.

3. Inspect for TCCM water intrusion.
4. Replace transfer case encoder/motor. 1. Check voltage on pin A, Light Blue wire at the engage switch.

2. The voltage should remain near 1.0v with no buttons pushed, compare to the value on the scanner when the problem happens.

3. Back close to the switch by hand and check for a glitch.

4. Wiggle tug test harnesses at the switch and TCCM.

5. Check terminal to pin grip. could be your transfercase control module locater under drivers side of dash. or the encoder motor

Oct 23, 2009 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

4 wheel drive switch always on auto 4 wheel drive


need to take vehicle in to get scanned, if p0327 code is present and oil inside of encoder motor, will need a new encoder motor sensor and bearing, will have to remove the t-case to install.

Oct 04, 2009 | 2005 Chevrolet Tahoe

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2005 Ford F150, 5.4L V8, 4x4; The transfer case


Encoder motor located on the transfer case is usually the problem. It is the motor that shifts the transfer case.

Sep 28, 2009 | 2005 Ford F-150

2 Answers

Chevrolet Suburban 4 Wheel Drive Indicator Lights


Just serviced my own 4x4 Suburban, by buying a 2nd hand encoder motor and replaced the old one, which was trashed by the winter salt. The device is prone to failure since it's made of alluminium and water has an easy time of entering the unit and trashing it.

CAUTION: Abbreviated gratuitous information of how an encoder motor was serviced. If unqualified to deal with repair, seek professional service.
CAUTION: Read at one's own risk.

To replace it, you need to crawl under the vehicle and remove the front drive shaft;

Disconnect the electric harness to the encoder motor, followed by unbolting it.

Take replacement encoder motor and install. There may be an issue with aligning the cogged cam of the transfer case to the encoder motor. If so, the vehicle's 4 wheels will need to be raised off the ground. The engine started, transmission in Park, and using a Vice-Grip® wrench gently rotate cam clockwise approximately 1/16 to 1/8 of an inch, then while set in this position, stop engine. Now attempt to align and attach the encoder motor.

After successfully attaching new encoder motor, attach its wiring loom.
Test vehicle.


Mar 22, 2009 | 2003 Chevrolet Suburban 1500

1 Answer

4x4 wont work


If you can have the codes scanned in your vehicle it would be very helpful to you. If you have a code for the encoder motor sensor or the encoder motor itself on the side of the transfer case, this is where i would begin, quite common with the push button 4 wheel drive. Thanks for using fixya!! good luck

Mar 08, 2009 | 1999 Chevrolet Silverado 1500

1 Answer

97 chevy k1500 push button 4 wheel drive. want enguage


Replace the encoder motor sensor and or encoder motor

Mar 02, 2009 | 1998 Chevrolet K1500

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