Subtle bouncing when idling and slow speed surging

[bowtie2007]

I have a 2020 Sierra 2500 diesel with 54,000 miles. For the last several months, my truck has developed a subtle rhythmic bouncing when idling. Being in drive or park does not make a difference. I've also noticed a surging when there is constant throttle around 25 to 35mph. The RPMs do not seem to move with the surging. If I let off the throttle or give more throttle, it stops. Is anyone else experiencing these issues?

[GMCustomerService]

46 minutes ago, bowtie2007 said:

I have a 2020 Sierra 2500 diesel with 54,000 miles. For the last several months, my truck has developed a subtle rhythmic bouncing when idling. Being in drive or park does not make a difference. I've also noticed a surging when there is constant throttle around 25 to 35mph. The RPMs do not seem to move with the surging. If I let off the throttle or give more throttle, it stops. Is anyone else experiencing these issues?

This is certainly not what we like to hear, bowtie2007.  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 2020 Sierra 2500. To do so, please send an email to [email protected] with ATTN: bowtie2007/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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[Njmurvin]

I have a similar shaking/bouncing feeling at idle (mostly in drive) ever since I had the last emissions recall (DPF temp) performed. I haven't taken it into the dealership yet to have it looked at.  Others have reported the same issue and suggest that an "injector small quantity reset" procedure fixes it.

[GMCustomerService]

On 11/15/2022 at 2:45 PM, Njmurvin said:

I have a similar shaking/bouncing feeling at idle (mostly in drive) ever since I had the last emissions recall (DPF temp) performed. I haven't taken it into the dealership yet to have it looked at.  Others have reported the same issue and suggest that an "injector small quantity reset" procedure fixes it.

This is certainly not what we like to hear, Njmurvin.  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 2020 Silverado 3500 LT Duramax. To do so, please send an email to [email protected] with ATTN: Njmurvin/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.
 
Privacy Statement | General Motors
Your privacy is important to General Motors. This Privacy Statement addresses the personal information GM collects and how GM handles that personal information.
www.gm.com
 

[bowtie2007]

I have a friend that also has a 2020 Sierra diesel and he asked me about the bouncing feeling following the DPF recall. I'm not happy with the reprogramming from that recall.