The AI that diagnoses cars with you.
Connect any OBD cable. Get AI-guided fault analysis — with live data, plain-English code explanations, and a diagnostic session stored in your shop portal. Find the fault fast. Fix it right.
No credit card. No spam. Just first access when we ship.
Both banks lean suggests a mass airflow sensor or vacuum leak upstream of the throttle body. The EVAP code is secondary — address the lean condition first.
Diagnose smarter, not harder.
Built for real repair shops and serious DIY — not a generic code reader app.
AI-Guided Diagnosis
The AI reasons through fault codes and live data alongside you — asking follow-up questions, showing its thinking, and narrowing the fault fast. No more guessing from a code list.
Cheap Cable or Pro Tool
Start with a $20 ELM327 OBD-II cable over USB or Bluetooth. Need key programming or ECU coding? TCW can drive professional OEM diagnostic tools for deep work.
Every Session Stored
Every scan, every AI conversation, every code — saved to your shop portal. Searchable by VIN, date, or fault code. Great for warranty comebacks and recurring issues.
Live Data + Plain English
Real-time gauges for RPM, O2, fuel trims, MAF, coolant — and every DTC explained in plain language, not just a code. Pre-purchase inspections and road-test capture built in.
Three steps to a confident repair.
No training required. No subscription bloat. Just connect, diagnose, fix.
Connect
Plug an OBD-II cable into the car's diagnostic port and connect to the TCW app on your tablet or laptop. The app reads the VIN and pulls all stored codes in seconds.
Works with USB and Bluetooth ELM327 adapters. Supports J1979, CAN, ISO 9141, and KWP protocols.
AI Diagnoses
The AI agent reviews all fault codes and live data streams, explains what it sees in plain English, and guides the diagnostic with questions. You answer; it narrows the fault.
Live gauges for O2, fuel trim, MAF, coolant, throttle, and more. All session data saved automatically.
Fix & Store
Repair with confidence. Clear codes, run a drive cycle, confirm readiness. The full session — codes, AI reasoning, tech notes — is stored in your shop portal forever.
Search any past session by VIN, date, or fault code. Perfect for comebacks and fleet history.
Built for the people who actually fix cars.
Your shop's AI diagnostic partner.
Speed up diagnostic time so your techs spend less time guessing and more time turning wrenches. Every session is stored — searchable by VIN, code, or date — so comebacks are a non-issue.
- Faster fault-finding = more cars per day
- Full session history for every vehicle
- Works alongside your existing scan tools
- Deep work: key programming, ECU coding via pro adapters
Fix your own car with AI confidence.
Stop paying the shop's diagnostic fee for a code read. TCW gives you the full picture — live data, AI analysis, plain-English explanations — so you know exactly what's wrong before you touch a wrench.
- Works with cheap ELM327 cables you already own
- Pre-purchase inspection mode
- Road-test live data capture
- Emissions readiness check before smog test
Be first to know.
Join the early-access list. We'll reach out to early members first — with pricing that won't exist at launch.