American V-Twin Diagnostics
V-Twin Diagnostics & Records
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Skip the $500 dealer diagnostic. Free circuit diagrams, DTC codes & torque specs. Guided troubleshooting paths for Twin Cam & Sportster — try Premium free for 3 days.
Your Harley is down. The dealer wants $300 just to look at it — and that's before a single wrench turns. Riding season doesn't wait, and neither should you.
Here's what a dealership diagnostic actually costs you:
Towing to the shop $300 – $500
Diagnostic inspection fee $90 – $300
Shop labor rate $160 – $190hr
Total before any repair $500 – $1,000+
Wait time Days to weeks
American V-Twin Diagnostics gives you the same systematic, circuit-by-circuit diagnostic process a trained Harley technician uses — for the cost of one month's subscription. Know exactly what's wrong before you ever call a shop. Walk in informed, not at their mercy.
Unlike Bluetooth scan tools that spit out a code and leave you stranded, this app tells you what the code means, what circuit to test, and exactly what to do next. It's the difference between knowing and guessing — and the difference between a $10 fix and a $1,000 misdiagnosis.
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FREE — NO SUBSCRIPTION REQUIRED
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Circuit Wiring Diagrams — All 12 EFI and mechanical systems with component locations, wire colors, and connector pinouts
DTC Code Lookup — 52 diagnostic trouble codes explained in plain English with probable causes and recommended fixes
Torque Specifications — 98 specs for Twin Cam 88/96/103/110 and Sportster Evolution 883/1200 engines
Service Intervals — Mileage-based maintenance schedules for Delphi EFI models
Bike Selector & Specs — 80+ supported sub-models with motor-specific details
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PREMIUM — 3-DAY FREE TRIAL, THEN $9.99/MONTH
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Guided Diagnostic Paths — 12 proprietary step-by-step decision trees for every major system: ignition, fuel, starter, sensors, security, ECM, brakes, suspension, steering, clutch, and more. Each path adapts to your test results and narrows down the root cause — no guesswork, no wasted parts.
Mechanic's Checklist — A comprehensive Delphi EFI health assessment with pass/fail grading, measurement fields, and a printable PDF — the same structured inspection a pro shop would charge you $150 to perform.
Motorcycle Garage — Save up to 3 bike profiles with full specs, mileage tracking, and service history
PDF Diagnostic Reports — Generate branded, shareable reports with circuit diagrams, findings, and recommended actions
Service Records & Notes — Log every service and store notes per bike
Diagnostic History — Every completed diagnostic saved and reviewable
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BUILT FOR YOUR SPECIFIC BIKE
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Select your exact year, model, and engine — Sportster, Dyna, Softail, Touring, or CVO — and the app filters everything to your platform. Twin Cam and Evolution Sportster diagnostics are handled separately. Magneti Marelli EFI models are flagged automatically.
No hardware. No dongle. No adapter. Just your phone and your motorcycle.
Download American V-Twin Diagnostics. Diagnose it yourself — before you hand over the keys and the cash.
Terms of Use: https://vtwindiagnostics.com/terms
Privacy Policy: https://vtwindiagnostics.com/privacy-policy
This update is about cleaning up the UI for a more polished experience.
The login experience has been rebuilt. If you don't have an active subscription, the app now takes you straight to the upgrade screen. If you're already subscribed, you'll see a clean logout option. The paywall has been simplified as well.
The app icon has been redesigned. Brighter, bolder, and more visible on your home screen.
Language across the app has been cleaned up and made consistent.
Under the hood, a series of performance and reliability improvements have been applied based on a full code review. The app loads faster, handles edge cases more gracefully, and behaves more predictably across all supported devices.
American V-Twin Diagnostics is built for riders who want to understand their machine — not just hand it over and hope for the best. Every update moves it closer to the tool you deserve.
The developer, Matthew Griffin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Matthew Griffin
- Size
- 48.2 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- V-Twin Premium $9.99
- Copyright
- © 2026 Classified AI LLC. All rights reserved. American V-Twin Diagnostics is a product of Classified AI LLC.