GENERATOR CODE VAULT™
The advanced technician's fault-code vault. 3743 diesel-generator codes across 38 brands and every major controller — look up any code, get the likely cause and the fix with spec values, and work fully offline at the unit.
Everything a tech needs at the unit
Instant code lookup
Type the code from any controller and get the meaning immediately — J1939 SPN/FMI, brand codes, controller alarm strings.
Diagnose & fix
Likely causes and step-by-step fixes with real spec values — sensor resistances, voltages, pickup gaps, torque, CAN termination.
Ask assistant
Describe the problem in plain words and get an answer from the built-in database — offline, or full AI answers when you add a key.
Controller how-to & PINs
Step-by-step for DEIF, DSE, ComAp, PowerCommand, EMCP, PowerWizard and more — enter service menus, read/clear codes, default PINs.
Your own codes
Add and save shop-specific codes and notes under any unit — right on your device, searchable like the rest.
Fast & offline
One installable app. No signal needed in a dead zone. Color-coded by brand and system, with a full FMI decoder.
Every major brand & controller
How it works
Pick the unit
Choose the generator or controller you're standing at.
Enter the code
Type the fault code or a symptom — or ask a question.
Get the fix
Read the cause, the fix steps, and the specs. Done.
Simple pricing
- All 3743 codes across 38 brands
- Causes, fixes & spec values
- Controller how-to guides & service PINs
- Offline Ask assistant (+ optional AI)
- Save your own codes
- Free updates as codes are added
FAQ
Does it work without internet?
Yes. The entire code database and all guides live inside the app, so it works fully offline — ideal in a dead zone at a jobsite.
Which brands and controllers are covered?
38 brands including Cummins, Caterpillar, Volvo Penta, Deutz, Perkins, MTU, John Deere, Kubota, Generac, MQ Power and more, plus DEIF, DSE, ComAp, Woodward, Basler, PowerCommand, EMCP and PowerWizard controllers — and the shared J1939 SPN/FMI decoder.
Is this a replacement for the service manual?
No. It's a fast reference aid for trained technicians. Always confirm against the manufacturer's manual and verify readings before performing repairs. See our Disclaimer.
How do I cancel?
Cancel anytime from your app-store account. Access continues to the end of your paid period. See Subscription Terms.
Trademark disclosure
Generator Code Vault™ and the Generator Code Vault logo are trademarks of gEncompass® LLC. All engine, generator, and controller manufacturer names, model names, code designations, and logos referenced in this application — including but not limited to Cummins™, Caterpillar™/CAT™, Volvo Penta™, Deutz™, Perkins™, MTU™, Scania™, John Deere™, Kubota™, Yanmar™, Isuzu™, Mitsubishi™, Iveco™/FPT™, Doosan™, Baudouin™, Detroit Diesel™, Generac™, Kohler™, MQ Power™/Multiquip™, FG Wilson™, SDMO™, Himoinsa™, Atlas Copco™, Denyo™, Wacker Neuson™, Lister Petter™, Bobcat™, Cummins Onan™, Deep Sea Electronics™ (DSE™), ComAp™, Woodward™, Basler™, DEIF™, SmartGen™, and PowerCommand™ — are the trademarks or registered trademarks of their respective owners. These marks are used for identification and reference purposes only. gEncompass® LLC and Generator Code Vault™ are independent and are not affiliated with, authorized by, endorsed by, or sponsored by any of these companies.