How Long Do You Need an Ignition Interlock in Texas?

In Texas, an ignition interlock device stays on your vehicle for at least 50 percent of your probation term after a DWI conviction, and the total time can run much longer once bond conditions, license suspensions, and repeat-offender rules are factored in. How long you need an ignition interlock in Texas depends on which stage of the case you’re in and what your record looks like. A first-offense misdemeanor might mean roughly a year with the device. A felony repeat offense can mean several years.

While Your Case Is Pending on Bond

If you’re arrested for a second or subsequent DWI, the magistrate setting your bond has to order an IID on the vehicle you own or drive most often. The same rule applies to a first arrest for intoxication assault, intoxication manslaughter, or DWI with a child passenger. The only way out is a specific magistrate finding, entered on the record, that the device would not be in the best interest of justice.¹

Installation is at your expense and must happen within 30 days of release.¹ The device then stays on for the entire time the case is pending. Every continuance, every reset, every plea negotiation adds to that time. If the case takes a year to resolve, that’s a year with the device before you even reach sentencing.

While You’re on Probation

Community supervision is where most people spend the longest stretch with an IID. After a DWI conviction, a judge has broad discretion to order the device. In several situations the judge has to order it.

When the Device Is Mandatory

A judge must order an IID if:

Your blood, breath, or urine analysis showed an alcohol concentration of 0.15 or higher.
You have one or more prior DWI-related convictions under Penal Code Sections 49.04 through 49.08 within the 10 years before the current offense.
You’re being punished as a repeat offender under Penal Code Section 49.09(a) or (b).

Outside those triggers the order is discretionary, but judges routinely impose it even on standard first offenses.²

The 50 Percent Rule

The statute sets a floor: the IID must stay installed for at least 50 percent of the supervision period.² That’s a minimum. A judge can order it for the full probation term and often does when the case involves a repeat offender or a high BAC.

To put that in concrete numbers: misdemeanor DWI probation can last up to two years, and felony DWI supervision (third offense or higher) can run up to 10 years, with a five-year minimum for certain felony intoxication offenses.³ A first-time misdemeanor DWI with two years of probation means at least one year with the device. A third-offense felony DWI with five years of supervision means at least two and a half years, and possibly the full five.

Installation and proof of installation to the court are both due within 30 days of conviction.²

After a Repeat DWI Within Five Years

A separate requirement applies if you’re convicted of a second or subsequent DWI committed within five years of the previous offense. Under Penal Code Section 49.09(h), the sentencing court must order an IID on every vehicle you own or operate, and the device must stay on until the first anniversary of the date your license suspension ends.⁴

Adult DWI license suspensions can last up to two years, so this alone can keep an IID on your vehicle for up to three years from the date of conviction.⁵ The requirement runs independently of any probation-related order. If the court finds you can’t afford the device, it can set up a payment plan, but the plan cannot extend past the first anniversary of the installation date.⁴

If You Drive During the License Suspension

A DWI conviction triggers an automatic license suspension. If you want to keep driving legally during that period, Texas offers two options, and both keep the IID on your vehicle.

The first is an interlock restricted license issued by DPS when a court orders the IID restriction. Your regular license expires 30 days after DPS sends notice, and you apply for the restricted version with a $10 fee. The restriction stays in place until the court removes it or the suspension ends. All reinstatement fees must be paid first.⁶⁷

The second is an occupational driver’s license with an interlock designation. Under this route, you must use an IID for the entire duration of the suspension, and the device stays installed the whole time the occupational license is valid.²

What Can Push the End Date Back

The device logs every breath sample, every skipped test, every missed service visit, and those records go to your probation officer or the court. Judges treat compliance failures seriously, and consequences run from extending the IID period to revoking probation outright. The violations that cause the most trouble:

Failed breath samples above the device’s preset threshold, typically 0.02 to 0.03 BAC. Trace amounts from mouthwash or hand sanitizer can trigger a failure.
Missed rolling retests during driving.
Tampering or circumvention, including having someone else blow into the device.
Missed calibration appointments, usually required every 30 to 60 days.

A pattern of violations doesn’t only extend your time with the device. It gives the judge grounds to revoke bond or probation, which can mean jail time.

Can You Get It Removed Early?

Once a judge sets the IID duration, there is no specific Texas statute that creates a standalone early-removal procedure. If the order is for 18 months, there’s no automatic right to petition for removal at 9 months based on good behavior. What can work is early termination of community supervision itself. If the court ends the probation, every condition ends with it, including the IID. Texas law generally allows early-termination motions after a portion of the supervision term has been served, though judges have discretion to deny them, and DWI cases involving mandatory IID conditions are harder to terminate early. Talk to your attorney about realistic timing before filing.

For deferred adjudication cases, the judge may waive the IID requirement entirely if a controlled-substance and alcohol evaluation determines the device isn’t necessary for community safety.²

How the Requirement Actually Ends

Reaching the end date doesn’t automatically clear anything. Before the IID company will uninstall the device, you need a court order carrying a court seal, or a vendor removal form signed by a judge or county clerk.⁸⁷⁶

1
State of Texas. Texas Code of Criminal Procedure Article 17.441
2
State of Texas. Texas Code of Criminal Procedure Art 42A.408 – Use of Ignition Interlock Device
3
State of Texas. Texas Code of Criminal Procedure Article 42A.053 – Judge-Ordered Community Supervision
4
State of Texas. Texas Penal Code 49.09 – Enhanced Offenses and Penalties
5
Department of Public Safety. Alcohol-Related Offenses
6
State of Texas. Texas Transportation Code Section 521.2465 – Restricted License
7
Department of Public Safety. Section 18 – Interlock
8
Department of Public Safety. Ignition Interlock Devices