# V-Twin Diagnostics — Harley Diagnostic Tool & DTCs

> Harley EFI motorcycle troubleshooting and service guide. (iPhone/iPad app by Matthew Griffin.)

- Source: https://appshunter.io/ios/app/v-twin-diagnostics/id6774809735 (this page in markdown: same URL + `.md`)
- Developer: [Matthew Griffin](https://appshunter.io/developer/1896149286)
- Category: Utilities, Reference
- Price: Free with in-app purchases
- Rating: 4.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.1 · 55 MB
- Languages: American English
- Released: 2026-07-04
- Data updated: 2026-08-28
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/v-twin-diagnostics/id6774809735/reviews.md

## What is V?

Your bike's down. The dealer's booked two weeks out. And they charge hundreds just to tell you what's wrong.

Every Harley rider knows this math: $100 to $300 for the tow, days or weeks on the lift waitlist, then a diagnostic fee just to be told what your bike was already trying to say.

V-Twin Diagnostics ends that. Answer questions about what your bike is doing, what you see, hear, and feel. The app walks the same systematic process a trained tech uses and lands on the probable cause in minutes. No code reader. No hardware. No waiting.

ONE DIAGNOSTIC PASS. EVERYTHING BELOW IS IN IT:
• Guided Diagnostic Path: proprietary step-by-step troubleshooting built for your exact year and model
• Comprehensive Diagnostic Report: complete specs, related trouble codes, the full path you followed, and findings, saved to your bike's profile
• Circuit Diagrams and Component Cards: see the actual system behind each probable cause
• A Parking Spot in Your Garage: your bike's profile with full specs, notes, and history
• Diagnostic History: every run saved, ready to review or export as a PDF

PAY ONLY WHEN YOUR BIKE NEEDS IT. NO SUBSCRIPTION REQUIRED.
• Diagnostic Pass, $9.99: one complete diagnostic. Never expires.
• 3-Pack, $24.99: bank them for when it counts.
• Annual License, $59.99/yr: unlimited diagnostics for every bike in your garage, less than half of one dealer diagnostic fee, plus the annual-only Mechanic's Checklists.

FREE FOR EVERY RIDER, NO ACCOUNT NEEDED:
• DTC code lookup: 71 trouble codes in plain English with probable causes
• Torque specs: 119 specs for Twin Cam and Evolution Sportster
• Recommended service intervals by mileage

FREE WITH AN ACCOUNT: a parking spot for your bike and the Oil Change Service Scheduler, free oil-change reminders matched to your bike and mileage.

Covers 2007–2017 Harley-Davidson motorcycles with Delphi EFI: Touring, Softail, Dyna, and Evolution Sportster, including CVO variants.

It's YOUR bike. It's been talking to you this whole time. Now you speak the language.

V-Twin Diagnostics is an independent aftermarket reference tool, not affiliated with or endorsed by Harley-Davidson.

Terms of Use (EULA): https://vtwindiagnostics.com/terms
Privacy Policy: https://vtwindiagnostics.com/privacy-policy

## Key features

- Symptom-based diagnostic Q&A
- DTC trouble code lookup
- Torque specs and service intervals
- Smart Service Scheduler
- Circuit diagrams
- Component identification cards

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| V-Twin Premium | $9.99 | per month |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/v-twin-diagnostics/id6774809735/reviews.md

### 3/5 — 3 star

*2026-07-31*

Unpaid version, it’s a great idea, but the free version.. if you’re going to offer a free version and tag free on the others included are least give full access. I just went into torque specs and there are just a few random ones. Maybe e off there was a way to add to the information or do a complete version not a whole lot of help so far

## Frequently asked questions about V

### What Harley-Davidson models does V-Twin Diagnostics support?

V-Twin Diagnostics is built specifically for 2007–2017 Harley-Davidson motorcycles with Delphi EFI, including Sportster, Dyna, Softail, Touring, and CVO 110ci models.

### How does V-Twin Diagnostics help with troubleshooting?

Unlike basic code readers, V-Twin Diagnostics uses a symptom-based Q&A to guide you through probable component failures, providing reasoning and identifying potential issues based on your bike's behavior.

### What are the benefits of the free version of V-Twin Diagnostics?

The free version includes a Smart Service Scheduler for maintenance reminders, DTC trouble code lookup with probable causes, 119 torque specs, service intervals, and a garage feature to log service records.

### What features are included in the V-Twin Premium subscription?

V-Twin Premium offers guided symptom-based diagnostic paths, circuit diagrams for EFI and mechanical systems, component identification cards, a mechanic's checklist, and up to 3 garage profiles with diagnostic history.

### How much does V-Twin Premium cost?

V-Twin Premium is available for $9.99 per month, with a 3-day free trial period to explore its advanced features.

### Does V-Twin Diagnostics require any hardware to use?

No, V-Twin Diagnostics operates entirely on your phone, eliminating the need for any external hardware, dongles, or scan tools.

### How often is V-Twin Diagnostics updated?

The app was last updated on July 4, 2026, with version 2.0.0, indicating recent development and potential for ongoing improvements.

### Is V-Twin Diagnostics suitable for beginners?

Yes, the app is designed to be user-friendly, walking riders through plain-language questions and providing clear explanations to help them diagnose issues without prior mechanic experience.

## Version history (last 3 releases)

### 2.1.1 — 2026-08-26

Improvements and fixes throughout.

TORQUE SPECS: Pick your model family — Touring, Dyna, Softail or Sportster — and see only your motorcycle's specs.

Also in this update: a fix for diagnostic circuits not opening, a smoother account verification flow, and general stability improvements.

### 2.1.0 — 2026-08-18

The biggest update yet — and the end of the subscription.

NEW: Pay only when your bike needs it. Diagnostic Passes are $9.99 one-time and never expire. Grab the 3-Pack for $24.99 and bank them for when it counts.

NEW: The Annual License, $59.99/yr, unlocks the Pro Tools — this is the full workshop:
• Unlimited diagnostics and Comprehensive Diagnostic Reports
• Five Mechanic's Checklists: Pre-Ride, General Health, Battery & Charging, Comprehensive EFI Health, and Pre-Purchase Inspection — pass/fail grading with printable PDFs
• The complete Illustrated Component Card library: all 49 probable-cause parts
• The complete Operational Circuit Diagram library: all 12 systems
• Complete specifications for your exact year, model, and engine
• Garage access for up to 20 motorcycles

BONUS: The Oil Change Tracker comes with your account. Odometer-based reminders for engine oil, primary, and transmission, each on its own interval.

NEW: Comprehensive Diagnostic Reports saved to your bike's profile, with printable PDF export.

IMPROVED: A full visual redesign across every screen.

STILL FREE: DTC code lookup, torque specs, and service intervals.

### 2.0.0 — 2026-07-04

No release notes.

## More apps by Matthew Griffin

- [American V-Twin Diagnostics](https://appshunter.io/ios/app/american-v-twin-diagnostics/id6765979058)

All apps by Matthew Griffin: https://appshunter.io/developer/1896149286

## Related topics

[harley trouble codes](https://appshunter.io/ios/topics/harley-trouble-codes)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*