Duramax Diesels Forum Truck of the Week
  #1  
Old 03-26-2020, 08:17 AM
clrussell's Avatar
clrussell clrussell is offline
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Default p0848 p0877 random

2006 gmc 4x4, Stock minus exhaust. trans appears to have been rebuilt at some point in its life.

truck will randomly range inhibit on the 1-2 shift when cold in the morning. does it almost every sunday morning when leaving for church.

stop and clear codes in park and your good to go.

I have checked the harness plug, installed a different tcm, and checked fluid level.

I have not pulled the pan off and verified filter installation, or visually checked internal harness. I wanted to make sure it wasn't a common harness issue or something and wanted to have parts on hand if it was.


thanks in advance guys. stay safe
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Old 03-26-2020, 12:12 PM
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Mike L. Mike L. is offline
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Try a new PSM and internal harness.
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Old 03-26-2020, 02:18 PM
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clrussell clrussell is offline
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Quote:
Originally Posted by Mike L. View Post
Try a new PSM and internal harness.
Thanks Mike, that was my next step. I was just making sure I was stepping in the right direction.
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Old 03-27-2020, 12:33 PM
Trimox Trimox is offline
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PSM? Assuming gets me in a lot of trouble.
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Old 03-27-2020, 01:04 PM
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Quote:
Originally Posted by Trimox View Post
PSM? Assuming gets me in a lot of trouble.
Pressure switch manifold
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