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Transmission learning question

MSmoke

By MSmoke
in Troubleshooting & Recalls

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MSmoke New Member

MSmoke

Posted
Posted

I am new to this forum, and would like to ask a question concerning my 2018 Sierra 1500 with a 6.2 motor and 8 speed transmission.  I took the truck to my dealer last week where they updated the transmission.  That did't affect the shifting issue I was having.  Hesitates between 1-2 and 2-3 shift, but after that shifts fine.  Sometimes I get a "clunk" when the tranny is downshifting.  Anyhow, this afternoon, I was going to take the truck back to the dealer so they could look at it.  Said they would give me a loaner car while they checked it out.  So I thought I would use the second key that has never been used before.  Dash came up as driver #2.  Truck drove great and the tranny issue was gone.  Is this possible?  Dealer didn't believe me, but told me to switch out keys periodically to see what happens.  Just curious if I've lost it.  Getting older.  Thanks for your help.

SS502 Senior Enthusiast

SS502

Posted
Posted
20 minutes ago, MSmoke said:

I am new to this forum, and would like to ask a question concerning my 2018 Sierra 1500 with a 6.2 motor and 8 speed transmission.  I took the truck to my dealer last week where they updated the transmission.  That did't affect the shifting issue I was having.  Hesitates between 1-2 and 2-3 shift, but after that shifts fine.  Sometimes I get a "clunk" when the tranny is downshifting.  Anyhow, this afternoon, I was going to take the truck back to the dealer so they could look at it.  Said they would give me a loaner car while they checked it out.  So I thought I would use the second key that has never been used before.  Dash came up as driver #2.  Truck drove great and the tranny issue was gone.  Is this possible?  Dealer didn't believe me, but told me to switch out keys periodically to see what happens.  Just curious if I've lost it.  Getting older.  Thanks for your help.

Welcome to the forums, it’s helped me a lot. I’ve never heard of the scenario you explained before. I too have the 2018 but haven’t had any problems so if there is an update I sure don’t want it lol. Keep us updated please!

Sierra Dan Senior Enthusiast

Sierra Dan

Posted
Posted

Might just be a placebo effect.

The different fobs are simply for driver memory settings.

These trucks can shift flawless one day and not so much the next. 6 or 8 speed.

 

Hillwood Enthusiast

Hillwood

Posted
Posted

The driver 1 and 2 key fobs only affect memory features.
The 8 speed trans has issues and it from the fluid... The dealership is getting the fluid and flush equipment to fix it..
Ask your dealer.

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MSmoke New Member

MSmoke

Posted
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Posted

So I drove the truck with the first key again to test my theory.  The tranny will hesitate or flare when shifting between 1-2 and 2-3 gears.  Wasn't as noticeable but still did it.  Used the second key to come home with.  No flare.  Truck would actually accelerate from stopped.  I could actually keep up with traffic.  I don't think I'm crazy.  I do have an engineering degree.  Been told I am crazy once or twice though.  Who knows.

Hillwood Enthusiast

Hillwood

Posted
Posted
So I drove the truck with the first key again to test my theory.  The tranny will hesitate or flare when shifting between 1-2 and 2-3 gears.  Wasn't as noticeable but still did it.  Used the second key to come home with.  No flare.  Truck would actually accelerate from stopped.  I could actually keep up with traffic.  I don't think I'm crazy.  I do have an engineering degree.  Been told I am crazy once or twice though.  Who knows.
Keep driving it with the second key and see what happens.

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Hillwood Enthusiast

Hillwood

Posted
Posted
Thats the plan.  Of course, when I get to 36000 miles the tranny will fall out of it.  
Warranty is 5 years 60K.

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