Question about 1994 Chevrolet S-10 Blazer

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4 wheel drive doesnt engage, service 4wd light comes on code co327 changed encoder motor and sensor tried used module had it reprogramed made it so the lights dont work on the switch. HELP

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That is the code for the transfer case control module. It is really expensive to replace, maybe $500 or more. Unfortunately, everytime I have had the code pop up, you will have to have the trans case drained, flushed, and the control module will have to be changed. I am truly sorry for the bad news, but I really hope all works out:(

Posted on Mar 06, 2009

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It feels like my 4WD is trying to engage when I am driving down the road. a terrible grinding noise comes and goes in my font end. What could this be?


The encoder motor on the transfer case could be engaging slightly.A c0327 is usually set in the transfer case module.Replace the sensor in the encoder motor if this code is present.

Dec 02, 2010 | 2003 Chevrolet Silverado 1500

1 Answer

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

1 Answer

Just replaced my encoder motor, front actuator, and dash switch....altough the transfer case engages it won't stay in 4 wheel drive for long


you may have to replace your trasfer case control module its right under dash driver side easy to access mine just went out it was throwing c0359 code 4 low cirut and service four wheel drive would come on dash although the 4wd works great it just throws the code.

Jan 01, 2010 | 2003 GMC Sierra

2 Answers

My 1999 chevy silverado 1500 four wheel drive won't engage. The truck is in 2wd now. When I push 4wd hi or low, I can hear the actuator try to engage the four wheel drive. The four hi or low button will...


You probably have a bad encoder motor.It is located on the side of the transfer case on the drivers side.It is black.The other problem they had with these was the switch but you have already replaced this so your next thing is the encoder motor.Hope this helps.Good luck.

Dec 28, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

Service 4WD Light comes on. What exactly do I need to do?


have a dealer read the codes from the atc module..if has code 327 it will need an encoder sensor replaced..if code 2735 it will need a switch replaced in dash..if code 306 check grounds under cab mount ..if grounds are good replace encoder motor

Dec 27, 2009 | 2004 Chevrolet Tahoe

1 Answer

4 Wheel drive not functional


There is a TSB on this problem: TSB #03-04-21-001C

Subject:4WD Switch Indicator Lights Flashing, 4WD Inoperative, DTCs C0327, P0500, P0836, P1875 Set (Replace Encoder Motor Sensor, Reprogram TCCM, Inspect Front Drive Axle Engagement Sleeve for Damage/Repair) #03-04-21-001D - (12/04/2003)



Models:2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2003 GMC Sierra, Yukon, Yukon XL
with 4WD and Electric Shift or Active Transfer Case (RPO NP1 or NP8)
You can also try removing the TREC fuse (engine fuse box) and reinstall after 30 seconds. Look up the TSB number I gave you and you'll find alot more information.

Dec 16, 2009 | 2003 Chevrolet Tahoe

1 Answer

Service four wheel drive


Without further diagnostics, it could be any # of causes, but these are notorious for bad conections at the transfer case encoder motor and /or the encoder motor itself.The motor,when replaced may need to be reprogramed.Be sure the switch and wiring are functioning properly as the encoder and/or related control module are pricy$$

Jan 10, 2009 | 2002 GMC Sierra

2 Answers

Service 4wd


If you had the switch and encoder motor replaced 5 months ago, then you have warranty. You need to return to the dealer and have them pull codes to see if it is the C0327 again. Some of these trucks also had grounding issues for the 4wd module. If it is the same c0327 code stay on them and make them confirm their original diagnosis.

Nov 23, 2008 | 2005 Chevrolet Silverado 1500HD

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