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I have a 2008 sierra denali with transmission codes

Customer Question
I have a 2008...

I have a 2008 sierra denali with transmission codes p0872-p0877 and p0989

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

It has all three as of right now.I have cleared the codes but they will come back in time.

Mechanic's Assistant: Are you fixing your Sierra Denali yourself? What have you tried so far?

Have not tried anything yey.I am going to pul the valve body and check the TCM

Submitted: 10 months ago.Category: GMC
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Answered in 6 minutes by:
9/26/2017
GMC Mechanic: Chris (aka-Moose), GMC Technician replied 10 months ago
Chris (aka-Moose)
Chris (aka-Moose), GMC Technician
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Welcome, I'm Chris (aka Moose).

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Do you know what these codes mean and how to diagnose them or are you asking for those diagnostic steps?

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GMC Mechanic: Chris (aka-Moose), GMC Technician replied 10 months ago

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