The Diesel Diagnostic Tool
Built for the Shop Floor
AI Diesel Tech reads your truck's fault codes, interprets every SPN/FMI, understands derate risk, and walks you through the exact physical tests to perform — right on your phone, at the truck.
What Technicians Actually Need
Most diagnostic tools tell you what the code means. AI Diesel Tech tells you what to do about it.
Instant SPN/FMI Interpretation
Enter any J1939 SPN and FMI combination. Get the fault description, derate risk level, inducement flags, and likely root causes — instantly.
Step-by-Step Physical Tests
AI Diesel Tech doesn't just describe the fault. It tells you which connector to check, which pin to probe, and what voltage to expect — in plain language.
Mobile-First Workflow
No laptop. No dongle. Open AI Diesel Tech on your phone, enter the fault code, and follow the guided workflow from the cab or under the hood.
How AI Diesel Tech Works
A diagnostic session takes under 2 minutes to start. The AI does the heavy lifting.
- 1
Enter your fault code
Type in the SPN and FMI from your scan tool, or describe the symptom in plain English.
- 2
AI interprets the fault
The diagnostic engine cross-references the fault against thousands of real-world repair outcomes, OEM service data, and TSB references.
- 3
Follow the guided test sequence
AI Diesel Tech generates a step-by-step physical test sequence. Each step tells you exactly what to check, measure, or inspect.
- 4
Confirm the root cause
As you answer each question, the AI narrows down the root cause. When it's confident, it tells you the fix and the parts needed.
- 5
Log the repair outcome
Record what you found and what you fixed. This data improves future diagnoses for the same fault code.
Why AI Diesel Tech vs JPRO or Jaltest
Traditional diagnostic tools read codes. AI Diesel Tech diagnoses faults.
| Feature | AI Diesel Tech | JPRO / Jaltest |
|---|---|---|
| Reads fault codes | ||
| Explains what the code means | ||
| Step-by-step physical test guidance | — | |
| Derate & inducement risk analysis | — | |
| Mobile-first (no laptop needed) | — | |
| AI-powered root cause analysis | — | |
| Repair outcome learning | — | |
| Free tier available | — |
Frequently Asked Questions
What is a diesel diagnostic tool?
A diesel diagnostic tool reads fault codes from a truck's ECM, interprets SPN/FMI codes, and guides technicians through physical tests to find the root cause. AI Diesel Tech goes further — it uses AI to generate step-by-step diagnostic workflows tailored to each fault code and vehicle.
How is AI Diesel Tech different from JPRO or Jaltest?
JPRO and Jaltest read codes and display generic descriptions. AI Diesel Tech interprets the fault, understands derate risk, and walks you through the exact physical tests to perform — on your phone, hands-free, at the truck.
Does AI Diesel Tech work on mobile?
Yes. AI Diesel Tech is a web-based tool that works on any smartphone or tablet. No laptop required. Technicians can run a full diagnostic session from the cab or under the hood.
What truck brands does AI Diesel Tech support?
AI Diesel Tech supports all J1939-compliant heavy-duty trucks including Kenworth, Peterbilt, Freightliner, Volvo, Mack, International, and Western Star. It covers Cummins, Detroit, PACCAR MX, Volvo D13, and Mack MP engines.
Is AI Diesel Tech free?
Yes — AI Diesel Tech offers a free tier with access to the fault code library and basic diagnostic sessions. Pro plans unlock unlimited sessions, advanced enrichment, and repair history tracking.
Start Your Free Diagnosis Now
No credit card. No download. Works on any phone. Enter your fault code and get a guided diagnostic in under 60 seconds.
Run Free Diagnosis