2013 LML Duramax P204F and P20E8 VXDIAG Solution

Here’s the tip to solve 2013 LML Duramax emissions light and fault codes P204F and P20E8 problems.

The first issues that came up was the CEL with P204F and P20E8 (Pump performance and Reductant Pressure Low) and then the emissions light came on a day or 2 later with the “Service Emissions Fluid System” message.

The mileage warning for DEF had flashed the week before and gone away, so I just figured it may have run out somehow without the usual mileage countdown. I added a jug of DEF to it and drove it hoping it would clear. I made it to around 20 miles left on the 65mph restriction before I could get a chance to troubleshoot. I already had done some research and had a spare pump and tech2 capabilities (Using wifi VXdiag vcx nano gm obd2 connector from vxdiagshop.com) in case I didn’t see an obvious fix.

I dropped the DEF tank, and it was empty when I took it down. The DEF discharge line on the pump had popped off allowing the DEF to just pump out unrestricted on top of the tank (the inside of the connector was a little mangled, probably it’s previous repair at the dealer). I removed the old pump (it was probably fine) and primed and installed the new one. I added a jug of DEF to the tank and propped it up on the floor and tested it before installing in case I had more issues to fix.

I ran a leak test and the pump immediately built pressure above and then steady at 500 kPa. I worked through the service bulletins for these by running the Reductant System Malfunction Warming Test. I ran it multiple times but the light remained on. I ran the Reductant Fluid Quality Test, which runs the rpm about the same as a Service Regen. After running these tests the emissions light still remained on. One of the bulletins had said to conduct a road test, so I put the DEF tank back in place and took it for a ride. I romped on it off and on for around 3 miles, and then the emissions light cleared. I didn’t clear the CEL with the scan tool after that, I wanted to see if it would clear itself, and it did after a couple of days.

Notes:

I would load vxdiag programs on a computer with no personal info. The GDS2 icon loaded and then disappeared due to anti-virus Trojan detection). Luckily I just needed the Tech2 programming because my truck is 2013. (The last available year that showed as an option). Read the vxdiag reviews for how to get the programs to load/open/work correctly.

The tank is easy to drop and reinstall. Having a floor jack to hold one end and help push up the straps was helpful.

SVCI MDI2 vs. VXDIAG Full Which is Better?

VXDIAG Multi Tool for Full Brands incl. GM and many other car brands is much more cost-effective than SVCI MDI2 which is supposed to purchase separately the models it can work with.

The above conclusion can be proved by one piece of SVCI MDI2 FAQ from the official site:

Q: SVCI MDI2 is all software free?

A: SVCI MDI2 is available in several versions, including standard, Mercedes, BMW, Jaguar Land Rover, Porsche, Nissan and all. Ben edition is on the basis of the standard version of the opening of Benz software function, other versions of the analogy, the all-powerful version refers to the opening of all software.

Look at SVCI MDI2 package:

And VXDIAG Multi Tool for Full Brands incl JLR HONDA GM VW FORD MAZDA TOYOTA Subaru VOLVO BMW BENZ with 2TB HDD with T420 laptop:

What about the functions Comparison?

1. VXDIAG Multi Tool for Full Brands

Generally speaking, VXDIAG Multi Tool can perform full-system diagnosis and programming functions for BMW, BENZ, GM, Ford / Mazda, Toyota, Honda, VAG, LandRover / Jaguar, Subaru, Volvo, Porsche Software etc.

Software version:

BMW   ISTA-D 4.28.22, ISTA-P 68.0.800

BENZ  2021.06, xentry 29.8.2.0, DTS 8.13.029

VW    7.1.1

JLR SDD V160

PW II  V18.100.000

VOLVO  2014D

FORD  IDS V124

MAZDA IDS  V124

GM    GDS2 V22.1.009 / 2020.7, tech2win 23.002,

TOYOTA Techstream V15.00.026

HONDA  HDS V3.103.048, i-HDS V1.005.048

SUBARU 2020.7, SSM3 V1.55.69.8, SSM4 V22.60

For the specific functions, this page list all:

https://www.vxdiagshop.com/wholesale/vxdiag-multi-diagnostic-tool-full-serie.html

And this article include all users questions and answers of VXDIAG Multi Tool for Full Brands

Next is SVCI MDI2 function:

As it claimed, it can perform these functions, but better refer to the users’ feedback.

DTC detect

Online programming

Coding

Immo match

Recalibration

Check circuit diagram

ECU flash

DTC description

Change Configuration

Data import / export

Okay, the author prefers VXDIAG Full Brands to SVCI MDI2 super vehicle communication Interface, coz VXDIAG Multi Tool save much money when they perform the same functions. You just take a deeper look at the manufacture’s description and customer feedback.

2008 Acadia TECHM Programming with VXDIAG VCX NANO GM

Have quite a few GM products in my family. Needed programming capability to replace a faulty TECHM in the Acadia, so I bought the vxdiag vcx nano gm gds2/tech2win as my Autel MX808 doesn’t have programming capability.

Pro tip: just throw out the included CD  and go to the VxDiag website to download the newest versions of everything. I followed the videos on the site, and got everything installed and working on a Win10 Pro, 64 bit laptop. Took a bit to figure it all out. Was able to reset adaptations, read and clear codes, do diagnostics, etc. on the Saturn VUE 2008 and Acadia 2008 in Tech2Win.

Have not tried anything yet on the 2018 Silverado as nothing is currently wrong with it and it’s still under warranty, but I got that software up and running as well. Hopefully I won’t need it for a while, but it’s good to know I have it and don’t have to go to the dealer.

Purchased a $40 license from GM for the Acadia, and was able to update all modules and code the new TECHM. This alone was worth every penny.

Basically, I have every diag tool a GM dealer would have access to, as well as programming if I buy the licenses, for a little over $110. Brilliant.