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Transfer Case Computer (tccm Or Tcscm)


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#1 Terry2001

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Posted 21 April 2009 - 09:07 AM

Hello All,

I'm in the processing of troubleshooting a 2001 GMC 1500 which refuses to switch from 4HI into anything else. See earlier post for reference http://www.gm-trucks...rt=#entry838305

So my question is......Will I have to have the dealer re-program the used TCCM to work/test in my truck?

Used TCCM = 2001 GMC Yukon, 5.3L, NP8, GM Part # 15749703 (Used part from wrecker)
My truck TCCM = 2001 GMC sierra 1500, 5.3L, NP8, GM Part # 15749703 (Currently in truck, not working?)

Any info on this is appreciated.


Thanks,
Terry

#2 seadoons

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Posted 21 April 2009 - 11:52 AM

Terry - based on my recent experience I am going to say yes. But, the dealership installed mine. They told me that when they put it in it was still throwing some codes / service 4WD message. They had to use the programmer to make adjustments. You probably aren't going to get much feedback on this one as it is a rare problem...I say just try it and find out what happens. Let us know what you find out!
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#3 LaCeS OuT

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Posted 22 April 2009 - 09:47 AM

I have a 99 Yukon with the NP8 Autotrak. I changed the TCCM myself and it did not require reprogramming from the dealer. YMMV though.

Edited by dwhults, 22 April 2009 - 09:47 AM.

1999 GMC Yukon SLT 5.7L
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#4 Terry2001

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Posted 22 April 2009 - 11:04 AM

New or used?

When you replaced the TCCM was it new or used? If used was it from a similar Yukon, similar features, or just another TCCM with matching part number?

And thanks for your reply, all input is appreciated.



Terry


I have a 99 Yukon with the NP8 Autotrak. I changed the TCCM myself and it did not require reprogramming from the dealer. YMMV though.



#5 LaCeS OuT

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Posted 22 April 2009 - 11:21 AM

Mine is the OBS Yukon with the 5.7. I bought the TCCM brand new from the dealer for $350, same part # as my old one. Just plugged it in and it worked. I had code C0315 which lead to the TCCM.

Edited by dwhults, 22 April 2009 - 11:21 AM.

1999 GMC Yukon SLT 5.7L
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Volant CAI | Magnaflow 18" Mufflers | 2.5" H-Pipe | Blackbear Tune
Vette Servo | 20" GMC Wheels | Timbren SES Kit | Addco Sway Bars


#6 Terry2001

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Posted 29 April 2009 - 08:31 AM

Installed used TCCM

Hello All,

I'm in the processing of troubleshooting a 2001 GMC 1500 which refuses to switch from 4HI into anything else. See earlier post for reference http://www.gm-trucks...rt=#entry838305

So my question is......Will I have to have the dealer re-program the used TCCM to work/test in my truck?

Used TCCM = 2001 GMC Yukon, 5.3L, NP8, GM Part # 15749703 (Used part from wrecker)
My truck TCCM = 2001 GMC sierra 1500, 5.3L, NP8, GM Part # 15749703 (Currently in truck, not working?)

Any info on this is appreciated.


Thanks,
Terry





---Installed used (junkyard) TCCM-------------------------------------------

So installed the used TCCM and it did not fix my problem, so I can't whether or not it requires the re-programming or not. Basically the truck now indicates another issue, the used TCCM changed the scenario a little so I'm trouble shooting again. Now I believe I'm looking at the Encoder Motor, once it is replaced I'll see if the used TCCM works.....

See this post for more info http://www.gm-trucks...rt=#entry845801


Terry

#7 Terry2001

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Posted 13 July 2009 - 07:15 PM

Just a message to close out this thread. I finally picked up a new actuator motor (motor on transfer case that switches from 2hi - 4hi - n - 4lo) and installed it. The install is very straight forward, removed the front drive shaft, disconnect two electrical connectors, remove 3 bolts and pull old motor out. The new one lined up on the shaft and re-install was reverse of removal.

Short of the long storey is the new actuator motor fixed the problem.....no more shifting issues. It's been 2 weeks and 400 miles, no issues at all.

Thanks to all that took the time to read and respond with suggestions and information.


Take-care,
Terry

PS. I now have a used TCCM for testing if anyone is interested?

#8 Stevens14

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Posted 13 July 2009 - 07:19 PM

Thats awesome news. Glad it worked out!

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#9 Terry2001

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Posted 08 December 2011 - 10:13 AM

TCCM is now gone.


Regards.




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