Chevy and GMC Duramax Diesel Forum banner
  • Hey Everyone! Enter your ride HERE to be a part of this months Ride of the Month Challenge!
1 - 6 of 6 Posts

·
Registered
Joined
·
8 Posts
Discussion Starter · #1 ·
I drive a 2015 Silverado. LML. (It has 170,000 miles). Truck is fully stock. I'm having a problem with the idle. It happens a lot but is not continuous. When parked the idle will increase to about 800 rpm. It usually sits at 625 rpms. When I put the truck through all the gears, or when I rev the engine, it will not help. It done this all this morning, but I'm in the truck now parked, and it's idling normally now. What all could cause this?
 

·
Registered
Joined
·
929 Posts
I drive a 2015 Silverado. LML. (It has 170,000 miles). Truck is fully stock. I'm having a problem with the idle. It happens a lot but is not continuous. When parked the idle will increase to about 800 rpm. It usually sits at 625 rpms. When I put the truck through all the gears, or when I rev the engine, it will not help. It done this all this morning, but I'm in the truck now parked, and it's idling normally now. What all could cause this?
Your truck is in regen when it is idling that high there is nothing wrong its supposed to do that
 

·
Registered
Joined
·
1,170 Posts
Yup. Make sure you are driving that thing at highway speeds for 20-30 min to let it complete the regen. Do enough idling without letting the thing regen like it should it will eventually plug the DPF up to the point that it won't be able to regen anymore and you'll have to either have the dealer or someone with a GM Tech II tool force a manual/service regen, or worse off, will have to take the DPF off and have a place bake the sucker to burn off all the hard particulates that will no longer come off during a regen.
 

·
Registered
Joined
·
929 Posts
🤦‍♂️.....Thanks. Seems I have a lot to learn about diesels
You might want to look in to buying an edge cts2 it is a digital gauge that you can set to show several parameters and it will show you when you are on regen
 
1 - 6 of 6 Posts
Top