Vibrations at highway speed

[BOSS8264]

07 Silverado Classic Cat-Eye Z71 

I have vibrations at highway speed,  but only when it is hot outside. Hit the brakes and vibration is way worse. Check engine light is on with bad injector code. Just need to figure out what is going on. Thanks for any assistance.  

[Westland]

What code is it exactly?  A bad injector will cause misfires that in-turn add to vibrations.  How long has the code been showing compared to the vibrations?  Is the code intermittent?

 

 

 

 

Edited June 22, 2022 by Westland

[BOSS8264]

Going to get the code now. The truck doesn't vibrate when I switch it to 4 wheel drive high range. So, I can't tell if it is front end, rear brakes or the injectors.  Code is solid. 

Edited June 22, 2022 by BOSS8264

[BOSS8264]

Can not find the paper with the code. I must have thrown it away. So, I will have it re-ran and send it over. 

[Westland]

While you're waiting on getting the code...

 

Does the truck vibrate/ shutter at low speeds while stopping?  Pulsing brakes? 

 

Do you notice higher RPM's at speed?

 

Does it pull to one side or the other at any speed while applying the brakes?

 

Do you feel vibrations more in one area than another? ie Steering wheel, seats, floor?

 

See if you we can rule out suspension and the brake system.