Guardian Interlock
Regional provider with a concentrated service footprint.
Where Guardian Interlock actually reaches
These figures come from our own index of 10,531 installation points, not from the brand’s marketing. A network is only useful if it reaches the town where you have to drive every 30 to 60 days for a calibration.
Guardian Interlock appears at 207 of the 10,531 points we have on file — 2% of the market as we measure it — spread over 10 states and 180 towns and cities. 81% of those addresses also install a competitor’s device. That is worth knowing: the shop is not tied to one brand, so switching provider often does not mean switching garage.
In 5 of those towns it is the only installer on file. If you live in one of them, the price you are quoted is the price there is.
Not found in Alaska, Alabama, Arkansas, Arizona, Connecticut, District of Columbia, Delaware, Georgia, Hawaii, Iowa, Illinois, Indiana, Kansas, Louisiana, Maine, Michigan, Minnesota, Missouri, Mississippi, Montana, North Carolina, North Dakota, New Hampshire, New Jersey, Nevada, New York, Ohio, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Vermont, Washington, Wisconsin, West Virginia, Wyoming — if you are there, one of the other providers is your route.
What Guardian Interlock costs
Guardian Interlock does not publish a single national price, and quotes vary by state and by the center doing the install. We are collecting confirmed quotes and will publish them here with the date each one was checked — not before.
States where Guardian Interlock has centers
Guardian Interlock customer service and phone numbers
We are not Guardian Interlock’s support desk and cannot see your account. These are the company’s own published lines, listed because they are unreasonably hard to find when a device has just locked you out.
customer service, stated as 24/7 and bilingual
Only Guardian Interlock can do these
- Billing disputes and the balance on your account
- A lockout code when the device will not let you start
- Booking or moving a calibration appointment
- The removal paperwork your state agency needs
- Anything the monitoring authority has already been told about your device
These we can help with
- Finding a certified center closer to you than the one you were assigned
- Checking what your state caps or requires, so you know what is negotiable
- Comparing what another approved provider charges before you commit
Numbers taken from www.guardianinterlock.com on 2026-08-23. Companies change them without notice — if one is wrong, tell us and we will fix it.
Where Guardian Interlock is approved, and under which device
States publish their own lists of vendors allowed to fit an interlock, and the model name on that list is what your paperwork has to match. This is the one claim about a provider that does not come from the provider.
| State | Device on the state list | Who publishes it |
|---|---|---|
| Texas | AMS 2000 and AMS 2500 | Texas Department of Public Safety, approved devices list · checked 2026-08-30 |
Approval in one state says nothing about the next one: each program keeps its own list, and a device accepted in Texas may not be accepted where you live. If you move mid-term, this is the first thing to check — before the provider tells you it is fine.
Compare before you commit
Providers rarely differ enough on the device to matter. The difference you feel is the monthly fee, the lockout policy, and how far you drive every 30 to 60 days for a calibration.
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