Jump to content
  • Sign up for FREE! Become a GM-Trucks.com Member Today!

    In 20 seconds you can become part of the worlds largest and oldest community discussing General Motors, Chevrolet and GMC branded pickups, crossovers, and SUVs. From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. 

Reduced Engine power (check engine/stabilitrak lights) code: P0191, 2015 suburban

Recommended Posts

I've been having an ongoing issue of my 2015 suburban going into Reduced Engine Power mode accompanied by a check engine light and stabilitrack light .

This has happened in the past and it was a vacuum leak . However, this time I'm getting code P0191 (fuel rail pressure sensor). I've spent tons of money on the following

Fuel rail cleaning

Throttle body cleaning

Fuel pump

Fuel rail pressure sensor

Checking wiring to the pressure sensor





After all of this I still have an intermittent issue of the truck going into a reduced engine power. It can happen twice in a day , or sometimes go 3 weeks without an occurrence, but it always happens.

I carry a code scanner with me at all times because resetting the codes brings the truck back to life temporarily.


Has anyone faced this same issue ? And if so what was finally the fix .

Thanks people , any insight is much appreciated.



Sent from my SM-G955U using Tapatalk



Link to comment
Share on other sites

  • 1 year later...
  • 1 year later...

Hello, I also have the P0191 and P00C6 2015 Yukon Denali 6.2. Bought a Fuel rail pressure sensor that I'm going to install this weekend but have a feeling it isn't going to fix the issue. Just wondering what should be next, the high pressure pump or the fuel pump itself. 

Link to comment
Share on other sites

  • 2 months later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.