AI Diesel Tech vs CAT ET
Off-Highway & Heavy Equipment Diagnostic Comparison
CAT ET is the OEM tool for Caterpillar engines and equipment.
AI Diesel Tech is the AI-powered diagnostic engine built for technicians who need fast, guided fault workflows without a laptop.
Try AI Diesel Tech FreeFeature Comparison
| Feature | AI Diesel Tech | CAT ET |
|---|---|---|
| Reads SPN/FMI fault codes | ||
| Step-by-step physical test guidance | ||
| AI root cause analysis | ||
| OEM bi-directional tests | ||
| Live data streaming | ||
| Mobile-first (no laptop required) | ||
| Hardware required | ||
| Free tier available |
Who This Tool Is For
CAT ET
- Heavy equipment shops
- OEM-level technicians
- Laptop-based diagnostics
AI Diesel Tech
- Field technicians
- Mobile mechanics
- Fleets needing fast fault workflows
Real-World Example: SPN 94 FMI 1 — Fuel Delivery
How each tool handles a fuel delivery fault in the field.
CAT ET
- Streams fuel pressure
AI Diesel Tech
- Explains symptoms like rough idle or hesitation
- Guides physical checks — filters, lines, pump
- Helps isolate root cause
CAT ET vs AI Diesel Tech — FAQ
What is CAT ET?
CAT ET (Electronic Technician) is the OEM diagnostic software for Caterpillar engines and heavy equipment. It requires a Windows laptop and a CAT Communication Adapter. It reads fault codes, streams live data, and supports bi-directional tests and programming specific to Caterpillar systems.
Can I diagnose a Caterpillar engine without CAT ET?
Yes. AI Diesel Tech supports Caterpillar SPN/FMI fault codes and provides step-by-step physical test guidance without CAT ET, a hardware adapter, or a Windows laptop. Enter the fault codes and the AI generates a complete diagnostic workflow.
What is the difference between AI Diesel Tech and CAT ET?
CAT ET streams live data and runs OEM tests on Caterpillar equipment. AI Diesel Tech explains the symptoms — rough idle, hesitation, power loss — and generates a step-by-step physical test sequence to isolate the root cause. CAT ET needs a laptop and hardware; AI Diesel Tech works on any smartphone.
Does AI Diesel Tech work with Caterpillar C15, C13, and C7 engines?
Yes. AI Diesel Tech supports Caterpillar C7, C9, C13, C15, and C18 engines. Enter the SPN/FMI fault codes from any scan tool and the AI generates a guided diagnostic procedure.
How much does CAT ET cost compared to AI Diesel Tech?
CAT ET requires a CAT Communication Adapter ($500–$1,500) and an annual software subscription. AI Diesel Tech has a free tier and paid plans starting at $12.95/month with no hardware cost.
Can AI Diesel Tech be used for off-highway equipment diagnostics?
Yes. AI Diesel Tech supports SPN/FMI fault codes used in off-highway equipment with Caterpillar and other diesel engines. Field technicians and mobile mechanics use it to get step-by-step diagnostic guidance without a laptop or hardware adapter.
CAT ET is OEM.
AI Diesel Tech is mobile, fast, and built for guided troubleshooting.
Try AI Diesel Tech free — no laptop, no hardware, no friction.