Duramax Diesels Forum Truck of the Week
  #1  
Old 08-08-2012, 06:01 PM
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JD Dave JD Dave is offline
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Default Is P2771 related to your torque converter

Last pull I got Ecm P2771 and Tcm 2771 It says its "Four wheel Drive circuit Switch low" but after doing some searches I found some people saying there was a problem with the converter locking and it will take so many key cycles to reset the tranny codes. Does clearing the codes clear my TCM trouble codes? Just seeing if anyone has had this problem before.
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Old 08-09-2012, 07:02 AM
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P2771 sets when the TC switch is in 4H but the TC was in 4L for 5 seconds or more. This will inhibit TCC. You need to put a Tech 2 on it and cycle the switch and see how slow it is moving the forks.
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Old 08-09-2012, 09:27 AM
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Thanks Mike.
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Old 10-27-2012, 01:51 AM
Armus Armus is offline
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Default Me Too

Hello transmission dude.

I have the same code (p2771). 2012 LML with non electronic transfer case shift lever on the floor. I was getting a trailer moving on a field and spun the wheels a bit in 2WD. Then my check engine light comes on. Everything works, 4Hi, 4LO etc. I cleared the code and it has not returned but I notice a whining noise when coasting down in four wheel drive. Wiggling the transfer case lever seems to alter the tone of this noise, but the noise stops when I shift back into 2WD.

Any ideas?
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Old 10-27-2012, 07:32 AM
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Quote:
Originally Posted by Armus View Post
Hello transmission dude.

I have the same code (p2771). 2012 LML with non electronic transfer case shift lever on the floor. I was getting a trailer moving on a field and spun the wheels a bit in 2WD. Then my check engine light comes on. Everything works, 4Hi, 4LO etc. I cleared the code and it has not returned but I notice a whining noise when coasting down in four wheel drive. Wiggling the transfer case lever seems to alter the tone of this noise, but the noise stops when I shift back into 2WD.

Any ideas?
I would have the dealer check it. I have heard of 1 transfer case that blew up on a new truck recently.
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Old 11-14-2017, 05:30 PM
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Anybody ever find a solution to this?


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