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Terry2001

Transfer Case Computer (tccm Or Tcscm)

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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.com/forums/index.php?...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

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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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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

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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.

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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

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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.com/forums/index.php?...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.com/forums/index.php?...rt=#entry845801

 

 

Terry

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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?

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Thats awesome news. Glad it worked out!

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