Answer
Nov 07, 2025 - 07:17 AM
Using a Power Vision 4 (PV4-15-04) on your 2023.5+ Harley-Davidson won't automatically void your entire warranty, but it's important to understand how warranties work with aftermarket modifications. Under the Magnuson-Moss Warranty Act, a manufacturer must prove that an aftermarket part or modification directly caused a failure to deny warranty coverage for that specific repair. However, if Harley-Davidson determines the tune contributed to engine damage (such as a blown motor from incorrect fueling), they could deny coverage for that particular claim. Your warranty on unrelated components (brakes, suspension, electrical systems unrelated to tuning) should remain intact.
That said, flashing your ECU does leave a digital footprint that dealers can detect, and warranty decisions can vary by dealership. I recommend discussing your plans with your Harley-Davidson dealer before purchasing to understand their specific warranty stance. Some dealers are modification-friendly, while others take a stricter approach. You can also contact Dynojet's support team at 800-992-4993 or visit dynojet.com/help-center if you have questions about how the PV4 interacts with your bike's systems—they can provide additional context to help you make an informed decision.
That said, flashing your ECU does leave a digital footprint that dealers can detect, and warranty decisions can vary by dealership. I recommend discussing your plans with your Harley-Davidson dealer before purchasing to understand their specific warranty stance. Some dealers are modification-friendly, while others take a stricter approach. You can also contact Dynojet's support team at 800-992-4993 or visit dynojet.com/help-center if you have questions about how the PV4 interacts with your bike's systems—they can provide additional context to help you make an informed decision.
