ACV facts & figures
Imagine a situation where a customer neglects or defaults on their auto payment. Using advanced technology, you can remotely disable their vehicle's ignition system with a single click, ensuring compliance without confrontation or inconvenience. Sounds too good to be true, right? Well, it’s not.
Today, vehicles and the companies that use and sell them are smarter and more connected than ever. With vehicle theft on the rise, business owners, fleet managers, and car dealerships— especially those that deal in second-chance or sub-prime lending or have a Buy Here Pay Here (BHPH) model— are utilizing more sophisticated tools to protect and track their inventory. One such tool is the Starter Interrupt Device, called a SID or even a “kill switch.” A SID is a game-changing option for keeping purchasers honest, preventing theft and ensuring your asset stays secure by preventing the vehicle from being used or stolen when a payment is late or repossession is imminent.1
But how does it work? And what happens if someone tries to outsmart it with a GPS disabler? Here’s everything you need to know about SIDs and why they’re a must-have for your car dealership.
What Is a Starter Interrupt Device?
In the simplest terms, a Starter Interrupt Device (SID) is a feature that stops a car from starting. Installed into the vehicle’s electrical system—like the starter motor or fuel pump—it disables the starter system and prevents the engine from turning over. SIDs can be controlled in two main ways: remotely via cellular networks or through pre-programmed conditions, like a missed payment.
For car dealerships, especially Buy Here Pay Here (BHPH) dealerships or those that offer sub-prime lending, this means you can enforce payment schedules without immediate repossession, saving time and resources while keeping your inventory safe.2
Benefits of Using Starter Interrupt Devices for Car Dealers
Ensures Payment Compliance
Late payments? No problem. SIDs encourage customers to stay current, preventing their vehicle from starting if they fall behind. Industry insights suggest dealerships that utilize SIDs see lower default rates—a win for your bottom line.
Deters Theft and Unauthorized Use
A vehicle that is stolen or driven without permission can be disabled it remotely, reducing the risk of losing the asset entirely.
Streamlines Repossession
Many SIDs come with built-in GPS tracking, so the vehicle can be located quickly and efficiently if repossession becomes necessary.
Offers Remote Control
Using SIDs allows businesses to manage their fleet or dealership inventory from anywhere. Whether it’s one car or a hundred, SIDs give you peace of mind and real-time oversight.
How Does a Starter Interrupt Device Work With a GPS Disabler?
What if someone uses a GPS disabler to avoid tracking? Will that stop the SID from working? The short answer is no. Here’s why it matters to your business.
Separate Systems With Separate Strengths
A GPS disabler is a device that blocks GPS signals and prevents location tracking. While many SIDs include GPS functionality that helps monitor a vehicle’s whereabouts, its core job—disabling the starter—relies on cellular networks. Even if someone jams the GPS signal to hide the car’s location, the SID can still receive a cellular command to shut down the starter.
Real-World Reliability
Occasionally, a customer misses a payment and tries to outsmart the system with a GPS disabler. They might be able to block tracking, but the SID’s ability to disable the vehicle remains unaffected. You can still enforce payment terms or prevent unauthorized use. A SID with included GPS capability is a bonus for recovery efforts.
Why It Works
GPS is a one-way system—satellites send signals to receivers to calculate location. This use of cellular networks that keep the SID operational regardless of GPS interference. GPS doesn’t handle two-way communications, like sending commands. A GPS disabler might make it harder to find the vehicle, but it won’t stop you from controlling it.
For businesses, the use of Starter Interrupt Devices is a smart protection strategy. You get GPS tracking when it’s available and reliable starter control no matter what.
Legal and Ethical Considerations of Starter Interrupt Devicess
Starter Interrupt Devices are powerful, but with great power comes responsibility. Before you implement them, keep these considerations in mind:
- Be Transparent: The Federal Trade Commission (FTC) mandates that customers know about the SID in their vehicle and that they understand when it might be activated. Clear communication builds trust and keeps you compliant.
- Follow Local Laws: Regulations vary by region and different states have specific disclosure rules. Check your local laws to ensure you’re using SIDs legally and ethically.
- Use Responsibly: SIDs are about asset protection, not punishment. Use them to enforce agreements fairly, and you’ll maintain good customer relationships while safeguarding your business.3
Starter Interrupt Devices Are the Future of Asset Protection
Starter Interrupt Devices aren’t just a trend; they’re a proven protection solution in today’s connected vehicle landscape. Whether you’re a dealership tackling the challenges of sub-prime lending or a fleet manager keeping tabs on a growing vehicle inventory, SIDs offer unparalleled security and control. And with their ability to function alongside (and in spite of) GPS disablers, they’re a reliable choice for any business looking to stay ahead.
Source Your Used Car Inventory With ACV Auctions
Starter Interrupt Devices are a smart way to protect your vehicles, but when it comes to keeping your lot stocked, ACV Auctions has you covered. With ACV, dealers can find used inventory nationwide 24/7 with our online car auctions. Every vehicle comes with a comprehensive condition report, created by our team of full-time inspectors who visit dealerships nationwide. From paint meter readings and engine audio to undercarriage photos and more, we gather the details you need to bid with confidence. Join the thousands of independent and franchise dealers who trust ACV to keep their lots stocked. Join today
Sources:
- (5 December 2018). What Is a GPS Disabler or Starter Interrupt Device? Shabana Motors. Retrieved March 6, 2025, from https://my.shabanamotors.com/blog/what-is-a-gps-disabler-or-starter-interrupt-device
- (17 December 2024). How Starter Interrupt Works on Vehicles. GPS Leaders. Retrieved March 6, 2025, from https://gpsleaders.com/how-starter-interrupt-works-on-vehicles/
- Dealership Tracking Your Every Move? Auto Fraud Legal Center. Retrieved March 6, 2025, from https://autofraudlegalcenter.com/custom-posts/dealership-tracking-your-every-move/
