Question about 1998 Chevrolet S-10 Pickup

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I have replaced the tccm with a new one from Gm and when I push the 4wd either high or low nothing happens no lights clicking or anything. But sometimes it works out of the blue but not often. any ideas. ps vac actuator has good vacuum and pulls.

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  • Chevrolet Master
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You musmust have a bad encoder motor,it bolded to back of transfer case,the size of a window motor,COMMON PROBLEM !!!! . Those tcc module do not go bad to often anyway good luck hope this helps.

Posted on Oct 07, 2009

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2003 Silverado 4WD. Service 4WD dash light comes on after engaging 4WD and acts up by engaging itself randomly for several days, then goes back to normal.


Check connection at the 4X4 control module , check power and grounds . Do you know how to do basic electrical testing ? Does your truck have manual or automatic trans mission ? Which transfer case does yours have ?

The NVG 263 transfer case features a three button shift control switch located on the instrument panel. When the ignition is in the RUN position, the transfer case shift control module (TCCM) starts monitoring the transfer case shift control switch to determine if the driver desires a new mode/gear position. At a single press of the transfer case shift control switch, the lamp of the new desired position begins flashing to inform the driver that the TCCM has received the request for a new mode/gear position. The lamp continues to flash until all shifting criteria has been met and the new mode/gear position has been engaged. Once the new mode/gear position is fully active, the switch indicator for the new position remains ON constantly. In the event that the TCCM can not or will not complete the shift, the indicator returns to the previously selected position; this is a Transfer Case Shift Control Switch Indicator Flashes, then Returns to Previous Mode condition.

The NVG 263 transfer case provides the driver with 4 manual mode/gear positions:
• 2HI - 2 Wheel Drive high range
• 4HI - 4 Wheel Drive high range
• 4LO - 4 Wheel Drive low range
• Neutral
Have it check for DTC'S - diagnostic trouble codes ?

DTC B0790
DTC B2725
DTC C0306
DTC C0327
DTC C0359
DTC C0379
DTC C0550

Your best bet would be take it to a qualified repair SHOP

Dec 28, 2016 | Cars & Trucks

1 Answer

Why can't I reset my check 4wd light on dash or move out of 2wd at all after replacing transfer case? Also motor cuts out and electronic throttle now won't open when won't start


Search Results

    GM 4WD Warning Light Issues - RepairPal

    repairpal.com > Car Care Advice > References
    Is your 4WD warning light on or a "Service 4WD System" message displayed? ...attempting to shift from 2WD high to 4WD low while the vehicle is moving), all the mode ... Resetting the TCCM may only be a temporary repair. ... The Bulb Check ...The mode switch on the dash will send a signal to the transfer case control ...

    How To Override Stuck 4WD On A GMC Vehicle, Transfer ...

    ? 10:55
    https://www.youtube.com/watch?v=qNQOt_JP78U
    Dec 29, 2014 - Uploaded by JamieJones TheCarMan
    How To Override Stuck 4WD On A GMC Vehicle, Transfer CaseControl ... My 07 GMC Yukon is stuck in 4 wheel drive low, can I do this same process on it? .... has been changed, the module was reset, and the actuator were all replaced. ... is being slughish when i start off from red light or stop sign but after ...

Jan 18, 2016 | Cars & Trucks

1 Answer

4wd dont work on my 01 dodge darango no lights on selector changed tccm still nothing


On the transfer case does it have a floating wiper motor in it

Mar 03, 2015 | Dodge Cars & Trucks

1 Answer

I recently purchased a 1999 Chevy Blazer 4WD LT with the 4WD AUTO 4 switch push button. We picked it up cheap. We now know why... 4WD dash switch is dead, changed it with a used one lights flash and n


Sounds like the encoder switch is bad ..it on the transfer case .it has a motor with wires going to it.when you press the button it sends a signal to that motor to switch into a certain gear..

Apr 21, 2012 | Cars & Trucks

1 Answer

2002 envoy code co550


you need to replace the tccm and get it programmed.


2-04-21-006E: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set No Communication with TCCM (Reprogram Transfer Case Control Module) - (Jul 20, 2006)
999999995.gif Subject: Inoperative 4WD/AWD Lamps, Inoperative 4WD/AWD System, DTC C0550 Set, No Communication with TCCM (Reprogram Transfer Case Control Module) Models: 2004 Buick Rainier 2002-2004 Chevrolet TrailBlazer, TrailBlazer EXT 2003-2004 Chevrolet Avalanche, Silverado, Suburban, Tahoe 2002-2004 GMC Envoy, Envoy XL 2003-2004 GMC Sierra, Yukon, Yukon XL 2004 GMC Envoy XUV 2002-2004 Oldsmobile Bravada with Electronic Shift or Active Transfer Case (RPOs NP1, NP4 or NP8)

This bulletin is being revised to add Subject information and change the labor operation. This bulletin cancels and supersedes Bulletin Number 03-04-21-006. Please discard Corporate Bulletin Numbers 02-04-21-006D and 03-04-21-006 (Section 04 -- Driveline/Axle).
ConditionSome customers may comment that the 4WD/AWD indicator lights on the selector switch do not work, or the 4WD/AWD system may be inoperative and/or the service 4WD light is illuminated. The condition is typically intermittent and always occurs at key-up. Upon investigation, the technician may find DTC C0550 set.
CauseThe Transfer Case Control Module (TCCM) has not received the wake-up call during key-up and has remained in the "sleep mode".
When the TCCM is in the "sleep mode", it will not communicate with the class II bus or the Tech 2®.
Correction
  1. Try to communicate with the TCCM. If no communication, go to step 2. If communication is possible, go to step 5.
  2. Remove the underhood (ATCM or TREC) TCCM fuse.
  3. Wait 30 seconds.
  4. Reinstall the fuse. The module should "wake up" and communicate with the Tech 2®.
  5. Check for codes in the TCCM. If a C0550 is found current or in history with or without other codes, replace the module and go to step 6.
  6. Reprogram the TCCM with the latest TIS software using normal SPS procedures.
  7. Verify operation and that no codes are present.
Important: For the 2002 model year, the TCCM must be replaced and reprogrammed.
Warranty Information

Jul 29, 2011 | 2002 GMC Envoy

1 Answer

4 wheel drive light flashes, wont lock in but transfer case seems to lock just not differential


You didn't specify which vehicle model you have, but most gm vehicles use vacuum to activate the 4wd system. Check all the vacuum lines you can locate for loose or disconnected line, cracked or gummy feeling lines. If you have the push button 4wd, listen for an audible click when you push the 4wd button. If you don't hear anything, the push button assembly may need replacing. If you did hear the click, then look under the battery tray for a loose vacuum line. Most gm 4wd problems are vacuum related.

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1 Answer

I've got a 97 Chevy k1500 with automatic trans and push bottom 4wd. transfer case will not engage into 4 high, all the lights flash. The truck will not shift into low range and 4wd does work in low but...


it could be one of 3 things, it could be a vacuum leak or the vacuum actaulor could be bad they are usually under the battery tray if that don't do it check the vacuum line under the truck for oil in the line if there is it will be the vacuum switch on the top of the transimission.

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1 Answer

Transfer case oil


the transfer case uses the same ATF as the trans.

May 30, 2009 | 1999 GMC Jimmy

2 Answers

4WD switch not working on a Hummer H2


Same thing happened with my H2 2003 model, no lights above the 4wd buttons and i can't switch between high and low 4wd.
did u know what is the problem ?

Mar 25, 2009 | 2005 Hummer H2

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