V-Twin Diagnostics
Harley EFI Troubleshooting
About
Troubleshoot your Harley EFI motorcycle with symptom-based diagnostics and service reminders. Access DTC codes, torque specs, and bike-specific information without hardware. Offers a premium subscription for guided troubleshooting and detailed diagrams.
What's New in V
2.0.0
July 4, 2026
Subscription plans
V-Twin Premium
Full diagnostic library, guided paths, PDF reports
Developer apps
FAQ
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.