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2020 Chevy gas harsh downshift

Nathan Leslie
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bryanhrdz New Member

bryanhrdz

Posted
Posted

I have this problem often, I thought I’d be vaciase I have larger tires and a calibrator to compensate for the large tire size but seems to happen no matter what - I reset the TCM( Transmission control module) and it works great. Sadly only for about a day until it goes back to “it’s normal” - The dealer said this is a fluke in the trans and the rhetoric I captured from them is that I should learn to live with it…

  • 5 months later...
Mafisher22 New Member

Mafisher22

Posted
Posted

I have the same issue. 2020 6.6 gas, I took it to dealer at about 35,000 miles. Hard down shift when coming to a stop or deccel to make turn. Dealer said it is within normal operating parameters. It is annoying.

  • 4 weeks later...
Hagar68 Enthusiast

Hagar68

Posted
Posted

I have both issues on my 20 gas hd.   Experienced the first decel/Accel burp under 1k miles, in tow/haul while pulling travel trailer.   Only once in a while since then.

 

The harsh down shifts from 2 or 3 are either getting more frequent or I'm listening for it more.

 

2.5 years old but only 15k miles

  • 2 weeks later...
GMCustomerService Senior Enthusiast

GMCustomerService

Posted
Posted
On 11/18/2022 at 8:40 PM, Hagar68 said:

I have both issues on my 20 gas hd.   Experienced the first decel/Accel burp under 1k miles, in tow/haul while pulling travel trailer.   Only once in a while since then.

 

The harsh down shifts from 2 or 3 are either getting more frequent or I'm listening for it more.

 

2.5 years old but only 15k miles

This is certainly not what we like to hear, Hagar68.  Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your truck. To do so, please send an email to [email protected] with ATTN: Hagar68/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.
 
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