Engine light on 2401 miles

Jnuehring · September 10, 2019

Engine light on, 2401 miles, currently on a long road trip. Stopped at GMC dealer for a code reader review. No tech to clear code, but reported ECU code. Told me to drive to my destination no issues. Just realized he put the 6.6 Gas Code in and not the LB7 for a duramax. Are these guys all morons?

Jglew82 · September 10, 2019

What do you mean by "Just realized he put the 6.6 Gas Code in and not the LB7 for a duramax."

LB7 hasn't been used since 2004. You have an L5P.

Jnuehring · September 10, 2019

L5P correct, my mistake, on his computer he clicked L8T, truck was running twenty feet away from him. Thought it strange he entered L8T, as i did know mine was a L5P.

Edited September 10, 2019 by Jnuehring

Jnuehring · September 10, 2019

I should have said something or questioned him. I assumed, which was my mistake.

Jglew82 · September 10, 2019

Gotcha, sounds like you need to stop into another dealer!

redwngr · September 10, 2019

Try the Onstar button.

dlockwood26 · September 11, 2019

I also had the engine light come on yesterday. 1,600 miles. Onstar reported code P20EE. Emissions. Service at my convenience. Will get it checked out with my dealer when I get home.

Edited September 11, 2019 by dlockwood26
Added image

powerhaulic · September 12, 2019

I got a P0700 tranny code yesterday, my Idash will only go that far.

Need to find out what the tranny thinks is wrong, as it is shifting fine.

bharris515 · September 12, 2019

17 hours ago, dlockwood26 said:

I also had the engine light come on yesterday. 1,600 miles. Onstar reported code P20EE. Emissions. Service at my convenience. Will get it checked out with my dealer when I get home.

how do you pull up the codes yourself like this?

dlockwood26 · September 13, 2019

8 hours ago, bharris515 said:

how do you pull up the codes yourself like this?

I am still in my trial period of Onstar. Just pushed the button and asked if they could see something. She told me and emailed me results. Kind of handy.

powerhaulic · September 13, 2019

Loss of communication is my issue, set several different codes.

Could be a glitch, or a pushed out pin on a connector....time will tell

LA20 · September 13, 2019

On 9/11/2019 at 6:58 PM, dlockwood26 said:

I also had the engine light come on yesterday. 1,600 miles. Onstar reported code P20EE. Emissions. Service at my convenience. Will get it checked out with my dealer when I get home.

What the dealership told you the solution was I’m having same issue

LA20 · September 13, 2019

Truck has 2700 miles 3weeks since I bought it .

bg1988 · September 13, 2019

On 9/11/2019 at 3:58 PM, dlockwood26 said:

I also had the engine light come on yesterday. 1,600 miles. Onstar reported code P20EE. Emissions. Service at my convenience. Will get it checked out with my dealer when I get home.

did you remember to fill up your exhaust fluid? or get any foreign substance in it? i.e fuel

Edited September 13, 2019 by bg1988