How Long Do You Need an Ignition Interlock Device After a DUI in California?
The short answer: after a California DUI conviction, the length of the ignition interlock device requirement depends on your record and whether anyone was hurt. Under Vehicle Code section 23575.3, a first offender with no injury faces an interlock period of up to six months, a second offense or a first injury DUI carries one year, a third offense carries two years, and a fourth or later offense carries three years. The device must go on every vehicle you drive, you pay for it on a sliding scale based on income, and the DMV will not issue a full license until the period is complete. The statewide program that began in 2019 was set to expire at the start of 2026, and the Legislature extended and expanded it in 2025, so the details below reflect the current rules as we understand them and should be confirmed for your conviction date. This guide from Gramling Law Group explains how the interlock requirement works from arrest through reinstatement.
What Is an Ignition Interlock Device?
A breath tester wired to your ignition. An ignition interlock device, or IID, is a handheld breath alcohol tester installed by a state-certified provider and connected to the vehicle's starter system. The car will not start unless you provide a breath sample below the device's preset limit, and the device demands rolling retests while you drive. Every sample, failed test, missed retest, and attempt to tamper with the device is logged and reported to the DMV and, in some cases, to the court and probation.
Installation and calibration are ongoing obligations. The device must be serviced and recalibrated at regular intervals, typically every 60 days, and a missed service appointment can be reported as noncompliance. Drivers in the High Desert should plan for the drive, because certified installers are concentrated in Victorville and Hesperia rather than in Barstow or Twentynine Palms. The provider, not the court, handles scheduling, so get the installation receipt and keep every service record.
How Long Is the IID Required After a First DUI in California?
Up to six months for a first offense without injury. For a first conviction under Vehicle Code section 23152, Vehicle Code section 23575.3 provides for an interlock period not to exceed six months. Under the original 2019 program, the judge had discretion to order the device or allow the driver to seek a restricted license instead. Legislation chaptered in 2025 moved toward requiring the device on a first conviction, so a first offender sentenced in Riverside or San Bernardino County today should expect an interlock order rather than hope to avoid one. Our guide to what happens after a DUI arrest in California walks through the surrounding process.
The interlock replaces the hard suspension. The practical benefit of installing the device is that a first offender can obtain an IID-restricted license from the DMV and keep driving to work, school, and the treatment program without waiting out a no-driving period. A first offender who refuses to install the device faces a conventional suspension and a longer wait for a restricted license. For most working drivers in Moreno Valley, Fontana, or Ontario, installing the device immediately is the faster route back to legal driving.
The court order and the DMV requirement are separate. The judge imposes the interlock as a term of the sentence, and the DMV separately conditions your license on proof of installation. If you complete the court's period but never file proof with the DMV, your license stays restricted or suspended. Both tracks have to be closed out, and your lawyer should confirm the DMV record before you assume you are done.
How Long Is the IID Required After a Second, Third, or Fourth DUI?
One year for a second offense. A conviction under Vehicle Code section 23152 with one prior DUI or wet reckless conviction within ten years requires a mandatory one-year interlock period under Vehicle Code section 23575.3. The judge has no discretion to waive it, and the DMV will not restore full privileges without proof of installation. We explain the broader consequences in second DUI in California with a prior within ten years.
Two years for a third offense and three years for a fourth. Two priors within ten years bring a two-year interlock, and three or more priors bring three years. A fourth DUI within ten years is also chargeable as a felony, and a prior felony DUI conviction independently triggers the three-year period. These periods run alongside the lengthy suspensions or revocations imposed under Vehicle Code section 13352, and the interlock is what lets a repeat offender drive during a revocation that would otherwise last years.
The ten-year lookback controls. Priors are counted under Vehicle Code section 23540 and the related sentencing sections using a ten-year window measured from offense date to offense date, and a wet reckless under Vehicle Code section 23103.5 counts as a prior for this purpose. Out-of-state DUI convictions also count when the DMV can match them. Getting the prior count right at the plea stage is critical, because a miscounted prior can add a year of interlock time that is very hard to undo.
How Long Is the IID Required After a DUI With Injury?
One year for a first injury DUI. A first conviction under Vehicle Code section 23153 for DUI causing injury requires a one-year interlock period even with no prior record. An injury DUI with one prior carries two years, and an injury DUI with two or more priors carries three years. Injury cases are usually filed as felonies at the Riverside Hall of Justice, the San Bernardino Justice Center, or the Clara Shortridge Foltz Criminal Justice Center in downtown Los Angeles, and the interlock is one of the smaller consequences, as we explain in felony DUI under Vehicle Code 23153.
Does a Wet Reckless Require an Ignition Interlock Device?
Not under the mandatory statute, but the judge can still order one. A plea to reckless driving involving alcohol under Vehicle Code section 23103.5 is not a conviction under Vehicle Code section 23152, so the mandatory interlock periods in Vehicle Code section 23575.3 generally do not attach. The court retains discretion under Vehicle Code section 23575 to order a device as a condition of probation, and the DMV's separate administrative suspension may still require one if the arrest involved a high blood alcohol level or a refusal. Avoiding the interlock is one of several reasons a wet reckless is worth negotiating, as we explain in what a wet reckless is in California.
The DMV suspension is independent of the plea. Even with a wet reckless in court, the DMV's administrative per se suspension under Vehicle Code section 13353.3 stands unless you won the DMV hearing. That is why the 10-day window to request a hearing after the arrest matters so much, as we explain in how the DMV hearing works after a DUI.
How Does the DMV Restricted License Work With an IID?
Proof of installation unlocks the restricted license. After the conviction is reported, the DMV requires proof of IID installation on form DL 920 from the installer, proof of enrollment in the DUI program, an SR-22 proof of insurance filing, and payment of the reissue fee before it issues an IID-restricted license. The restriction allows you to drive any vehicle equipped with a functioning device, with no limits on destination or hours. The form numbers and fee amounts change, so use the DMV's current website rather than any figure in an older article.
The administrative suspension and the conviction suspension overlap. A first offender who loses the administrative hearing receives a four-month suspension under Vehicle Code section 13353.3, and the conviction then triggers a six-month suspension under Vehicle Code section 13352. The DMV generally credits time already served under the administrative action, and the interlock restriction can be issued during either period. Your lawyer should obtain your DMV driving record after sentencing to confirm the dates line up.
Refusals complicate everything. A chemical test refusal brings a one-year suspension under Vehicle Code section 13353 with no restricted license available during the administrative period, and under Vehicle Code section 23575 the court must give heightened consideration to ordering an interlock when the driver refused or tested at 0.15 percent or higher. The refusal allegation is often the first thing we attack, as we explain in refusing a breathalyzer in a California DUI.
Who Pays for the Ignition Interlock Device?
You do, on a sliding scale. Vehicle Code section 23575.3 requires the installer to reduce installation and monthly costs for drivers whose income falls within set percentages of the federal poverty level, with the provider absorbing the difference. The 2025 legislation raised the income thresholds and expanded the covered costs to include administration, installation, service, maintenance, and recalibration. You must apply for the reduced rate with income documentation, and the provider must post its fee schedule. We do not quote dollar figures here because they vary by provider and change over time.
Missed payments become compliance problems. A provider can report a driver who stops paying, and the DMV treats a removed or lapsed device as a failure to maintain the interlock. If money is the problem, apply for the fee reduction before falling behind rather than after the provider has reported you.
What Happens If You Drive Without the IID or Tamper With It?
Driving a vehicle without the device is a new crime. Under Vehicle Code section 23247, it is a misdemeanor to knowingly rent, lease, or lend a vehicle to a person subject to an interlock requirement, for that person to drive a vehicle not equipped with a functioning device, to tamper with or circumvent the device, or to have another person blow into it. A conviction can bring county jail time and will extend the interlock period. It will also be charged alongside driving on a suspended license under Vehicle Code section 14601.2, which carries its own mandatory minimums, as described in driving on a suspended license under Vehicle Code 14601.
A probation violation follows. Because the interlock is a probation term, a tampering report or a failed-test pattern lands you back in front of the sentencing judge at the Victorville courthouse, the Rancho Cucamonga courthouse, or the Southwest Justice Center in Murrieta for a probation violation hearing, where the standard of proof is lower than at trial. Read how probation works in California for the mechanics.
Failed tests are not always violations. Mouthwash, certain medications, and some foods can produce a brief positive reading, and the device will usually allow a retest within minutes. A single failed start is rarely treated as a violation, but a pattern of morning failures suggests drinking, and prosecutors read the logs. Keep your own record of every failed sample and the reason, because the explanation matters later.
Can You Avoid the Ignition Interlock Device Entirely?
Only by avoiding the DUI conviction. The interlock is tied to a conviction under Vehicle Code section 23152 or Vehicle Code section 23153, so a dismissal, an acquittal, or a plea to a non-DUI offense such as a wet reckless or an exhibition of speed avoids the mandatory period. That is why challenging the stop under Penal Code section 1538.5, the breath or blood result, and the rising blood alcohol timeline matters, as we explain in how to beat a DUI in Riverside County and what a 1538.5 motion is.
An exemption exists if you do not own or have access to a vehicle. The statute allows a driver who certifies under penalty of perjury that they do not own a vehicle and do not have access to one at home to be exempted from installation, though the restricted license cannot issue without a device. Drivers who later acquire a vehicle must install the device before driving it. Lying on the certification is its own crime, so this is not a workaround for someone who intends to keep driving.
High Desert and Inland Empire drivers face the same rules. Whether the case is heard at the Victorville courthouse after a stop on the Cajon Pass, the Barstow courthouse after an Interstate 15 stop, or the Larson Justice Center in Indio, the interlock periods are set by state law. Local practice differs mainly in how quickly the court demands proof of installation, which is described generally in our guides to DUI at the Victorville courthouse and DUI at the Barstow courthouse.
Do You Need a Lawyer for the IID Portion of a DUI Case?
Yes, because the interlock period is decided at the plea. The prior count, the injury allegation, the refusal allegation, and whether the case resolves as a DUI or a wet reckless all fix the interlock term, and all of them are negotiated before sentencing. A lawyer who requests the DMV hearing within ten days, challenges the chemical test, and negotiates the charge can shorten or eliminate the interlock requirement entirely. Daniel Gramling, Esq. handles DUI cases across Riverside, San Bernardino, Victorville, Los Angeles, and Orange County courts and offers flat-fee criminal defense and limited-scope options so the cost is known before the first court date. First offenders should also read do I need a lawyer for a first DUI in California.
Frequently Asked Questions
How long do I have to have an interlock for a first DUI in California?
Up to six months. Under Vehicle Code section 23575.3, a first conviction under Vehicle Code section 23152 with no injury carries an interlock period not to exceed six months. Installing the device promptly is what allows the DMV to issue a restricted license so you can keep driving.
Is the ignition interlock mandatory for a first DUI?
It is now the expected outcome. The 2019 program gave judges discretion on first offenses, and 2025 legislation moved to require the device on a first conviction, so plan on an interlock order in Riverside, San Bernardino, and Los Angeles County courts. Confirm the rule that applies to your conviction date with your lawyer, because the statute has been amended more than once.
Can I drive someone else's car while I have an IID requirement?
Only if that car has a device installed. The requirement applies to every vehicle you operate, and driving a vehicle without a functioning interlock is a misdemeanor under Vehicle Code section 23247. An employer-owned vehicle exemption exists for driving in the course of employment with the employer's written notice, but it does not cover vehicles you own or control.
Does the interlock period start at conviction or at installation?
Generally at installation and proof to the DMV. The clock does not run while the device sits uninstalled, and the DMV will not credit time until it receives the installer's verification. Delaying installation only pushes the completion date further out.
What happens if I fail a breath test on the device?
The failure is logged and reported. A single failed start usually just prevents the car from starting until a clean retest, but a pattern of failures, skipped rolling retests, or a tampering alert can be reported to the DMV and the court, extend the interlock period, and trigger a probation violation hearing. Document the circumstances of any failed test immediately.
Does a DUI expungement remove the interlock requirement?
No. A dismissal under Penal Code section 1203.4 is available only after probation ends, by which time the interlock period is normally complete, and it does not affect the DMV's licensing actions or the ten-year prior count. See how to expunge a criminal record in California.
Talk to a Southern California DUI Defense Lawyer
Gramling Law Group defends DUI cases at the Riverside Hall of Justice, the Southwest Justice Center in Murrieta, the Larson Justice Center in Indio, the San Bernardino Justice Center, the Rancho Cucamonga, Victorville, and Barstow courthouses, the Clara Shortridge Foltz Criminal Justice Center, and courthouses throughout the Inland Empire, Los Angeles County, Orange County, and Southern California. Daniel Gramling, Esq. offers flat-fee criminal defense and limited-scope options for drivers in Riverside, San Bernardino, Victorville, Hesperia, Fontana, Ontario, Moreno Valley, and Los Angeles. Call (909) 654-4575 or contact us through this website for a consultation.
This article is educational and is not legal advice. Reading it does not create an attorney-client relationship. It addresses California law only.
Related Guides From Gramling Law Group
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