Hello from the HD world!

Sean from Greensboro Manager Posted   Latest   Edited  
Heavy Duty

Google any light duty vehicle symptom. Tons of discussions. Google anything to do with HD. Crickets.

I don't know everything - in fact I learn I know even less than I thought I knew every subsequent year I am in the HD diesel diagnostic and repair field. However, I am not afraid to enter a discussion and learn from others. The last 10 years of my career have included dealership, fleet, rental and "mom and pop" shop experience. ASE master tech, Isuzu cert., Hino master elite, Mack/Volvo master, and certs from about everyone else out there. I understand all the systems on a Class 3-8 truck as well as the next guy but my concentration has been in emission diagnostics. Besides being a full-time Penske employee, I also am a SME (subject matter expert) for ā€¦, (think JPRO, DLA). I have found that to maintain competence as a SME for, inter alia, an HD software diagnostic company, continuity in the diagnostic and repair field is all but required.

I wish to be a participant, not merely a consumer on this forum. Any questions to do with JPRO, DLA, HDobd and HD protocols in general (Jā€¦, 15765) and especially with emissions systems (EGR, DPF/DPR, SCR, VGT), I would be happy to give my humble 2 cents and love to hear from others. Basically I would like to offer a channel for the HD'ers out there.



Marlin from Estacada



Sean? Nicole? Penske? Trucksrgr8t? Who are you? To whom should questions be addressed? 

I have more questions regarding this strange post, but I will stop here for now. ;)


Sean from Greensboro



If you have any serious questions or discussions to do with trucks, you can hit the little reply button. As stated, my name is Sean.


Scott from Claremont



Hi Sean,

One of our support staff reached out to Nicole via email yesterday regarding this account as it was clear that it was being used outside of our guidelines. As of this morning we've not seen a response. Since then, I personally reached out to the contact number provided by Nicole when she signed up for DN. Within the greeting, it was stated that the company she represents is Noregon. If this is indeed true, we need to update the account so that it truly reflects who she actually works for.

Per our Terms of Use: diag​.​net/terms

As a user of the Site, you agree not to

2. Make any unauthorized use of the Site, including collecting usernames and/or email addresses of users by electronic or other means for the purpose of sending unsolicited email, or creating user accounts by automated means or under false pretenses.

Additionally, the account listed under her name is to be only used by her. You will need to establish an account under your own name and use it in accordance with our policies.

Please contact ā€¦ to confirm receipt of this message and provide us with a contact number so we can reach out and correct these discrepancies. 



Tyler from Gilbert



Welcome aboard Sean! There aren't too many HD people here yet, but I'm sure they will keep coming. 

You are right about Google and HD stuff, it is very limited. This is kind of a self plug, but here are two resources for you and anyone else. Both are free.

TruckFaultCodes​.​com - Quick repair information on every commercial truck diagnostic code. You can use the website or the mobile apps (iOS and Android). Over 60,000 diagnostic codes logged, all for free.TruckPartsCross​.​com - Free platform to cross reference medium and heavy duty truck parts. 

I'll have to keep you in mind for our Isuzu & HINO questions! There are some really odd ball things we see with those trucks.


Sean from Greensboro



Thanks, Tyler! I have used those above sites and they are a great help in the field for a reference! I wish there was more casual dialogue from HD technicians sometimes, talking about the real world experiences. No "tool" can absolutely emulate the knowledge gained from hard knock experiences. And absolutely feel free to ask me Isuzu and Hino questions! Hino has a special love/hate place in my heart lol.


Michael from Champaign



Welcome Sean, I work on the big stuff like you. My experience is on Transit Buses. I work on Cummins, Thermo King, Allison Hybrid, Bae Hybrid, Vansco and Allen Bradley multiplexing, ZF, Meritor Wabco Abs, I do a ton of electrical and driveability work and I also use a Scope quite a bit also. If you ever get hung up on something I'm more than happy to assist.šŸ™‚


Edwin from Charleston


Mobile Technician

Sean. I work on the ld and hd stuff. If you have questions don't hesitate to ask.