Question about 2004 Chevrolet Avalanche

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Do you have to calibrate the encoder motor when replacing it in a 2004 Avalanche?

When you start the truck sometimes it is in 4WH, 4WL, Auto, 2WD, Sometimes it says is even in neutral. If you put the car in neutral and push the button it will usually go into 2WD sometimes you have to keep turning it off until it resets itself. I have been told the encoder motor needs to be replaced.

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Posted on Jan 02, 2017

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SOURCE: 4wd problem with 2004 chev 1500

the control module they often go out good luck

Posted on Sep 20, 2008

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SOURCE: 2004 Suburban 4 wheel drive

set as default most likely either that or computer error. please email me at with any other info or questions

Posted on Sep 30, 2008

  • 1 Answer

SOURCE: 95 Blazer 4X4 Problem

Ok I just got my 4x4 working again. I got it to work by taking out the 4wd, brake, and I believe the ctsy fuses for about one minute each and put them back in and now my 4x4 works like it used to. If that works for anyone else great, but if not then good luck finding a better solution to the 4x4 problem.

Posted on Feb 03, 2009

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SOURCE: On a 2003 Avalanche with push button 4wd,

we had same problem,it was caused by shifting trans selector to quick after startup,not waiting for electronics to cycle on initial startup.

Posted on Apr 29, 2009

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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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2004 CHEVY SUBURBAN 2500 4WD. At times after starting, it will automatically be in 4wl or neutral. causing me to shut off re-start re-select 2wd.also the service 4wd comes on. Ideas??

Pull switch and check to see if bad solder connections, or just replace switch. Easiest and possibly cheapest of the options.

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94 explorer wont move in any gear when clutch is engauged in 2wd or 4wh but does move in 4wl,what gives

Something up the transfer box ,exactly what i could even think of why,if i had vehicle in front of me then i might be able to work out the problem but it could be the selector on the transfer box in some shape or form -

Nov 14, 2014 | Ford Explorer Cars & Trucks

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2004 tahoe will not shift into 2wd. it operates fine in 4wd auto and 4wd. from doing some research and getting advice it seems to be the transfer case encoder motor and/or sensor?

try reversing truck when you select 2 wheel drive ,this sometimes takes it out of four wheel
like a cone clutch .just need a little pressure off it .reversing takes pressure off hope this helps

May 25, 2011 | Chevrolet Tahoe Cars & Trucks

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4wd wont engage-intermittent-auto sometimes fails to engage the 4wd-sometimes the 2wd light is on-other times no lights are on

You either have a switch problem or the shift shaft seal is leaking oil into the shift motor(encoder motor) on the transfer case(t-case). A switch is an east fix but if it's a seal leak you have to remove and disassemble the t-case in order to replace the seal then you have to replace the encoder sensor and get it reprogrammed by a dealer. Not easy or cheap.

Jul 17, 2010 | 2001 Chevrolet Silverado

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Flashing 4WH and 4WL lights on the dash with switch position on Auto. What does it mean and what is needed to fix the problem? Car dirves fine.

This is purely a guess, but it seems to point towards the four wheel drive High and Low range, (Transmission)

Jul 12, 2010 | 1998 Ford Explorer

3 Answers

I have a 2005 GMC Yukon XL. The service 4WD is on.

Yes you do have to take it to the dealer, This is a common problem in these trucks. This is caused by a bad encoder sensor in the shifter on the side of the transfer case. The sensor can be replaced with out having to replace the shifter assembly.

THe best test is to get the code from the system. This sensor is a sliding resistor and the material wears off causing a false reading. That is why the lights were showing Nothing, but you were able to drive. The code for the sensor is C0327.

TBS: #PIP3480M: Rattle Drone Or Buffeting Noise At Highway Speed In 2WD Or DTC C0327 - keywords 246 2hi 2high 4WD auto awd buffet buzz case click indicator knock lamp light service tick transfercase transfer vibrati - (Mar 4, 2008) Vehicles involved were built approximately between 01/01/04 and 03/06/06. The noise condition if not noticed by the customer may cause eventual encoder sensor wear causing DTC C0327 set in the Transfer Case Control Module (TCCM).

An updated TCCM calibration has been released to apply light pressure to the transfer case clutch pack and reduce the rattle. The calibration was released on 3/18/07 and the title line will read "to correct transfer case rattle at highway speeds and possible DTC C0327". For Rattle only (no current DTC C0327 set), Install the updated calibration and if necessary follow the diagnostics listed below

If the vehicle has a current or history dtc C0327 and can be diagnosed to the encoder sensor, re-flash with the updated calibrations and replace the encoder sensor as necessary.
Important Note: All NV246 transfer cases built 02/25/06 and beyond are manufactured with pressed fit parts to help reduce the rattle. Inspect the ID tag on the transfer case for this build date and verify the tccm has the latest calibration before repairs are initiated.

Thank you fur using Fixya and good luck.

Apr 20, 2010 | 2005 GMC Yukon Xl Denali

1 Answer

4wd not engaging 4wh flashing green light 4wl nothing at all hear click but not engaging

the 4wd acuator is stuck the clicking you hear inside the car is the relay sending power to it if you have acces to a lift somtimes if you tap on the acuator it will engage the motor if you havent used it in a while

Feb 24, 2010 | 2004 Toyota Tundra

1 Answer

2004 chev avalanche---4 wheel drive kicking in

possibles--chech and test 4wd / transfer case module --faulty switch --- transfer case failing

Dec 23, 2017 | 2004 Chevrolet Avalanche

1 Answer

1991 Ford F150 Jumps out of 4W drive sometimes in reverse

My 94 did the same thing. In a automatic, you have to come to a full stop, it usually grinds when in 4L ,And for the shifter, I had to look at mine, 2w is all the way forward to the dash, then 4H is toward you 1 click, and "N" is the next toward you, then 4L , you have to push the lever down and pull backwards. Always come to a full stop when changing gears and wait a few seconds before changing direction.

Jan 13, 2009 | 1991 Ford F150

1 Answer

4wd problem with 2004 chev 1500

the control module they often go out good luck

Sep 20, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

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