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I have a 2001 GMC Sierra 4x4 Since we've gotten the truck in
I have a 2001 GMC Sierra 4x4 Since we've gotten the truck in the 4x4 has not worked properly. Have code c0323 Replaced selector switch, replaced encoder motor, and replaced tccm. Still unable to get 4… read more
Pete
Pete
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My front axle is not disengaging in 2wd unless I take the
My front axle is not disengaging in 2wd unless I take the actuator out. I put a new one in and it came out and wo t go back In.… read more
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I have a 03 Gmc Sierra 5.3 ext cab, I have the 246
I have a 03 Gmc Sierra 5.3 ext cab, I have the 246 transfercase with m-30 and np8 opt 2 weeks ago I had the dreaded intermittent 4x4 codes, I replaced the encoder motor and axle actuator and worked gr… read more
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
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I've got an '07 GMC 3500 HD 4x4 Duramax with a "Service 4
I've got an '07 GMC 3500 HD 4x4 Duramax with a "Service***** fault showing on my instrument panel. I have swapped the actuator out on the front drive axle, renewed the shift knob in my dash, checked f… read more
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Jason Hablutzel
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I have an 02 silverado 2500 HD after replacing the cab due
I have an 02 silverado 2500 HD after replacing the cab due to accident my 4wd service light came on. I have 2 codes CO327 and B2725. I have already replaced the switch. The truck was without batteries for a few months. Does the TCCM need to be reprogrammed or could it be a broken wire? … read more
Ron
Ron
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GMC Sierra: Four wheel drive selector switch isn't working
Four wheel drive selector switch isn't working no lights at all after a rough day yesterday and the day before of the truck trying to go into 4X4 going down the road local mechanic said replace the sw… read more
Gary
Gary
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GMC Jimmy 4x4 (Mid Size): 1995 GMC Jimmy Ill try to be as
1995 GMC Jimmy Ill try to be as specific as possible, I had a rebuilt transmission put in recently but I don't know if it has anything to do with my problem because I didn't use the 4wd much before th… read more
Gary
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GMC seiara: I have a 2004 Gmc Z71 4x4 and theXXXXX
I have a 2004 Gmc Z71 4x4 and theXXXXXlight keeps coming on, any help.Thanks Mark. I had replaced thr 4 wheel push button control about aweek ago and replace the sensor about 3yrs ago. Any one hame?… read more
Gary
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GMC Sierra 1500: I received a DTC CO327 on my 2004 GMC sierra.
I received a DTC CO327 on my 2004 GMC sierra. I'm going to replace the encoder ring. The transfer case is stuck in 4 low therefore the encoder motor should be in 4 low position. If I pull the encoder … read more
Gary
Gary
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GMC Suburban K25/K2500 4x4: 1998 gmc suburban 2500 4x4 7.4.
1998 gmc suburban 2500 4x4 7.4. serviceXXXXXlight comes on. I have replaced the 4x4 switch, transfer case modle, encoder, and tccm. the light still comes on and it goes in and out ofXXXXX any ideas? c… read more
Chris (aka-Moose)
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GM SIERRA 3500: The red "n" light on the dashboard 4wd light
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Pete
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GMC Jimmy 4x4 (Mid Size): 99 JIMMY 4X4 ..VACUUM ACTUATOR WORKING
99 JIMMY 4X4 ..VACUUM ACTUATOR WORKING (CONFIRMED)(CABLE PULLS PROPERLY) , AXLE SWITCH NEW, TCCM WORKING .. ENCODER MOTOR BAD??? WHAT ELSE CAN IT BE ?? HAVE I MISSED ANYTHING (4 BUTTON SWITCH ON DASH … read more
Gary
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GMC 2500HD: 2005 duramax 6.6 3/4 t 4x4, service 4x4 light on,
2005 duramax 6.6 3/4 t 4x4, service 4x4 light on, switch wont work. code reads B0827 C0327, endcoder sensor faulty. Where is this located and is it hard to replace? GM says $450 parts and $300 to repl… read more
Gm Tech (Cam)
Gm Tech (Cam)
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GMC Yukon SLT: I have a 2003 Yukon that is 4WD. The transfer
I have a 2003 Yukon that is 4WD. The transfer case switch on the dash from time to time stays in the neutral position with the light flashing red even though it is in 2hi. I have replaced the switch o… read more
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GM sierra 1500 sle: the light on the automaticXXXXX
the light on the automaticXXXXXbutton comes on and says it is in neutral but runs great. I had it put on a computer this morning and nothing showed up.… read more
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Pete
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Hummer H2: 4wd neutral switch light comes on and stays on when
4wd neutral switch light comes on and stays on when vehicle key is turned, yet transfer case is still on 4hi and able to drive.… read more
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Pete
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GMC Sierra 1500: dealer told me i had a b2725 code, which is
dealer told me i had a b2725 code, which is to replace my 4x4 switch. On a 2004 sierra, i just replaced the switch with a brand new one from the dealer and it still has the service 4x4 light on the da… read more
Gm Tech (Cam)
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
32,421 satisfied customers
1998 GMC Serria 1500 4x4 transmittion push buttons. Electric push button for 4x4 high ran
1998 GMC Serria 1500 4x4 transmittion push buttons. Electric push button for 4x4 high range not working. The low range 4x4 and high range 2 select work.… read more
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

32,421 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,589 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

904 satisfied customers

24 years of experience diagnosing & repairing

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

Mike S.

Mike S.

ASE Certified Technician

256 satisfied customers

GMC N.A.I.S.E. Certified Auto-Mechanic

George H.

George H.

ASE MasterTechnician

233 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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