Weak acceleration

[Racer593]

I have a 2018 2500hd CCLB. It is mainly used for pulling my 11,000 lb toyhauler. The truck has 40,000 miles. I started noticing recently that on longer trips, the further into the trip I get, the acceleration from a full stop becomes almost dangerous. When I begin the trip, acceleration is normal, but After driving for a few hours, if I come to a full stop and accelerate (stop sign or red light) I can put the pedal all the way to the floor, and it barely comes off idle. Around 4-5 seconds later it will slowly start to pick up rpm and then it’s fine until I stop again. Engine and trans temps are all in spec and  no SES lights on the cluster. 
Just trying to see if anyone else has experienced the same issue, and if so, what did you do to fix it. 

[newdude]

Gas?  Diesel?

[Racer593]

Sorry. 6.0 gas. 6L80

[newdude]

5 minutes ago, Racer593 said:

Sorry. 6.0 gas. 6L80

 

6L90.

 

How are the transmission temps?  6L80/90 are known for bad fluid pumps as a result of the torque converter failing.  They won't always show codes either when they do.  

[Racer593]

Trans temp was 185° at 90° air temp. Happened after about 4 hours driving. 

[GMCustomerService]

On 8/28/2023 at 1:39 PM, Racer593 said:

I have a 2018 2500hd CCLB. It is mainly used for pulling my 11,000 lb toyhauler. The truck has 40,000 miles. I started noticing recently that on longer trips, the further into the trip I get, the acceleration from a full stop becomes almost dangerous. When I begin the trip, acceleration is normal, but After driving for a few hours, if I come to a full stop and accelerate (stop sign or red light) I can put the pedal all the way to the floor, and it barely comes off idle. Around 4-5 seconds later it will slowly start to pick up rpm and then it’s fine until I stop again. Engine and trans temps are all in spec and  no SES lights on the cluster. 
Just trying to see if anyone else has experienced the same issue, and if so, what did you do to fix it. 

This is certainly not what we like to hear, Racer593.  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 2018 Chevrolet Silverado presenting weak acceleration. To do so, please send an email to [email protected] with ATTN: Racer593/GM Trucks in the subject line.

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