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P026D code

Tmckinney20

Member
Supporting Member
Nov 17, 2022
33
11
Truck Year
2018
P026D
I never had this code until I installed a GDE tune. I have had it numerous times since and especially when towing. Spoke to the guy a few times at GDE, think it was Keith but I am not positive. Well they or he, keeps saying I have a vacuum leak. If it were a vacuum leak it would pop the CEL every time I drove it. I even put a smoke machine in the lines to confirm I did not have a leak. It is something to do with the tune and GDE does not know how to fix it so they just pass the blame. Typical no service after the sale company. If anyone fines any additional information or answers please post for all to see.
 

1shadowsabre

Well-Known Member
Oct 18, 2015
742
270
Truck Year
2015
Very odd that you would have customer service issues with GDE. They are well known for their products and customer service. Following this thread and hopefully you get an easy resolution.
 

Tmckinney20

Member
Supporting Member
Nov 17, 2022
33
11
Truck Year
2018
Very odd that you would have customer service issues with GDE. They are well known for their products and customer service. Following this thread and hopefully you get an easy resolution.
Brother I was surprised to. I like the tune and it's options. Other than the code, I like the improvements.
 

Gnurps

New Member
Nov 30, 2021
1
0
Truck Year
2020
I got that same code on my 2020 EcoDiesel with GDE tune. Did a bunch of web searching and found confusing information, if you can call it that. Was getting ready to call Keith at GDE and then the code just went away, and its has not come back for months. I actually had two codes, P026D and P020B.

With the codes gone, should I consider the problem solved?

If it were a vacuum leak it would pop the CEL every time I drove it.
What is the CEL?
 

Tmckinney20

Member
Supporting Member
Nov 17, 2022
33
11
Truck Year
2018
I got that same code on my 2020 EcoDiesel with GDE tune. Did a bunch of web searching and found confusing information, if you can call it that. Was getting ready to call Keith at GDE and then the code just went away, and its has not come back for months. I actually had two codes, P026D and P020B.

With the codes gone, should I consider the problem solved?


What is the CEL?
CEL is Check Engine Light. Yes, the light does go back off when a few more drive cycles have passed. But it is a never ending cycle of off and on with the same code. I would not call it resolved, but with the cel going back off the ECU does not detect any further problems until it comes back on.
 
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