18 Denali won’t go past 85 mph

[Big_Kahuna]

On 1/11/2020 at 4:57 PM, 18siknali6.2 said:

Hello guys I’m new to the forum I drive a 18 Sierra Denali . I’ve been having trouble with . Like a couple weeks ago , Was driving to work and truck wouldn’t go past 85 mph . I really don’t know what could be the problem . Anyone knows or has it happen to somebody else in here . Thanks ! No lights or anything came up in the dash ! 

Is not that typical for GM trucks? 

[newdude]

1 hour ago, Smiley78 said:

I have the same issue with my 2017 suburban. Before I could get up past 85 mpg . Now it shuts down at 85mph like there is a speed limiter on it. I have had the tires calibrated. I also have the suspension light come on from the factory air suspension being disconnected. Have had the 6” lift for years now and 35” tires on it, it just all of sudden started happening. 

 

 

Do you have Magnetic Ride?

[It's Tim]

[Tommy Balius]

My 2015 won’t go over 92. They have it governed 

[Chad Hilliker]

Ok, Mine just starting do this, this week, thottle response acts as it should to 85 mph. At 85 mph on the dot vehicle will no longer increase in speed, and you can press the thottle to the floor at this time and you get no response to this action,  vehicle will maintain this speed till your speed deceases and then goes back in to normal operation again. 

 

Has anyone found a solution to this issue yet?