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Valve body First real issue with my 2015 High Country

maronha
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maronha Enthusiast

maronha

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Not a frequent poster to the forum but I thought I might share my issue. I was driving along at normal speed approaching a turn up the mountain. My speed slowed slightly and as I went to give it some gas and the transmission decided to make some hard shift and loose power. I was able to limp it back to my house which was 3 miles away. Had it towed to the dealer and here is the results. I will add a couple pics of the truck also. One with her summer shoes and one with the winter boots. Truck has right about 60k.

cf37e92b1752d03d39a4df1cb4c0017b.jpg21afc95ca9debdd4a54f3fe8acc8cbfb.jpg0dc6b87608e6fdf0193f5464e32f73d9.jpg

 

 

 

 

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Mike GMC Enthusiast

Mike GMC

Posted
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Glad they got it fixed for you.  I think this may be the first time I've heard of a valve body issue. Usually it seems to be TC issues.  Hopefully the repair lasts you.

njk4o5 Enthusiast

njk4o5

Posted
Posted

they replaced my valve body first when I brought mine in for the transmission shifting issues. Then they replaced 1 more thing every time I brought it back until I got a reman transmission form GM. Hope your issue is resolved but if it starts screwing up again bring is back to them asap

maronha Enthusiast

maronha

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they replaced my valve body first when I brought mine in for the transmission shifting issues. Then they replaced 1 more thing every time I brought it back until I got a reman transmission form GM. Hope your issue is resolved but if it starts screwing up again bring is back to them asap

Most definitely will take it back. Just glad it was under warranty. So far so good [emoji1696]. I thought it had been shifting a little funny leading up to the failure. Seems these transmissions just have issues.

 

Has the reman transmission been trouble free?

 

 

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njk4o5 Enthusiast

njk4o5

Posted
Posted

so far yep its been trouble free. Although the tuning still sucks and it usually has no idea what gear to be in when driving in city traffic

diyer2 Senior Enthusiast

diyer2

Posted
Posted

If it was me I would put the trans in manual for slow traffic.

Say 3rd or 4th gear.

Excessive shifting causes heat.

 

:)

maronha Enthusiast

maronha

Posted
  • Author
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so far yep its been trouble free. Although the tuning still sucks and it usually has no idea what gear to be in when driving in city traffic

Good. Yea when my problem happened it was like the trans just didn’t know what to do then bam.


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NWI Denali Enthusiast

NWI Denali

Posted
Posted

I had the valve body replaced om my 2017 8L90. Check engine light popped on randomly one day. Truck drove and shifted fine. By the time i got it into the shop was probably 60-80 miles later, and it still drove fine. The tech pulled the code and it was a trans solenoid fault. He drove it and said he lost 4th gear and got it back to the shop in limp mode. Has been fine since (the last 5k miles) but I have bad feelings about the longevity of this 8 spd. Lol

  • 3 years later...

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