Ignition interlock — Utah Permit Test

A Utah driver convicted of a first DUI is automatically restricted to a vehicle with an ignition interlock device for 18 months, or three years if they were under 21 when arrested.

The device takes a breath sample before the engine will start, and it stays on the car long after the suspension ends.

When an individual has been convicted of a first DUI, they are automatically restricted to driving a vehicle that has an IID installed for 18 months from the date of conviction or the effective date of the license suspension or three years if they are under the age of 21 when they are arrested.

A Utah driver convicted of a second or subsequent DUI, or revoked for refusing a chemical test, is restricted to a vehicle with an interlock device for two years.

The second time the device stays on longer, because the state has stopped taking the driver’s word for anything.

they are automatically restricted to driving a vehicle that has an IID installed for two years from the date of conviction or the effective date of the revocation

A felony DUI in Utah carries a three-year interlock restriction, and automobile homicide carries a 10-year restriction.

Ten years with a breath test between you and every journey is what the worst outcome of drunk driving costs.

Felony DUI carries a three-year IID restriction, and automobile homicide carries a 10-year IID restriction.

A Utah interlock-restricted driver must have the device monitored at least every 60 days.

The device records every attempt. Monitoring is how those records reach the state rather than sitting in the car.

Ignition interlock-restricted drivers are required to have the device monitored at least every 60 days.

A Utah interlock requirement is extended by 60 days each time a driver fails to have the device monitored or tries to start the vehicle at 0.02 alcohol or higher.

Each failed breath adds two more months. A restriction can outlast its original term without a court ever being involved.

If a driver fails to have the device monitored or if they attempt to start the vehicle with a measurable amount of alcohol of 0.02 or higher, the ignition interlock requirement will be extended by 60 days for each occurrence.

A Utah driver who drives without an interlock device while restricted may have the vehicle impounded and be cited under the interlock restricted driver law.

Driving the family car instead of the fitted one is the obvious way around the device, so Utah wrote a law for exactly that.

If an individual drives a vehicle without an IID installed when restricted, the vehicle may be impounded.

A conviction for violating the Utah interlock restricted driver law revokes the license for one year and adds a two-year interlock restriction from the date of conviction.

Getting caught without the device resets the whole arrangement, and adds a year with no license at all.

A conviction for violating the IRD law will result in the driver license revocation for one year and an additional two-year IID restriction from the date of conviction.

A Utah driver whose interlock device is removed before the restriction period ends has their driving privilege suspended again.

Taking the device out early is treated as though it was never fitted, and the suspension comes straight back.

If the IID is removed from the vehicle before your ignition interlock driver restriction period ends, your driving privilege will be re-suspended.

How long is the interlock restriction for a first Utah DUI at 21 or older?

18 months. The device takes a breath sample before the engine will start, and it stays on the car long after the suspension ends. Utah Driver Handbook 2026-2027, p.54: “When an individual has been convicted of a first DUI, they are automatically restricted to driving a vehicle that has an IID installed for 18 months from the date of conviction or the effective date of the license suspension or three years if they are under the age of 21 when they are arrested.”