California Ignition Interlock Program: DMV Rules and What's Required After a DUI
Written by BACtrack Editorial Team
Updated June 22, 2026
California requires an ignition interlock device in many DUI cases, depending on offense type, prior record, and whether the restriction comes from the court, the DMV, or both. Under California Vehicle Code 23575, mandatory IID periods range from six months for a first offense to three years for a fourth or subsequent offense. Two separate authorities govern the requirement: the court imposes an IID as a probation condition, while the DMV issues an IID restriction on your driver's license through its own administrative process.
What follows covers the general framework: who typically needs an IID, how installation works, what counts as a violation, and how the requirement ends.
Which DUI Convictions Require an IID in California
California IID requirements depend on the offense, prior DUI record, and whether the restriction comes through the DMV's administrative process, a court-imposed probation condition, or both.
According to the California DMV, all repeat DUI offenders and all DUI offenders whose offense involved injury to another person are required to install an IID. The mandatory period ranges from one to four years depending on the number of prior DUI convictions within a ten-year lookback window.
First-offense DUI cases without injury may be treated differently. Depending on how the case is resolved and current DMV process, a first-time offender may have the option to install an IID in lieu of other license consequences rather than face a mandatory requirement. The exact outcome depends on the specifics of the case.
If your offense involved drunk driving with a passenger under 14 years old, child endangerment enhancement penalties may apply and can affect the term of any IID requirement.
An attorney familiar with California DUI law can advise on how the rules apply to your specific offense and record.
BACtrack Drive provides certified IID installation and monitoring service for California drivers beginning the requirement process in the San Francisco Bay Area and Sacramento region.
How the California IID Requirement Works: DMV vs. Court
Two separate authorities may impose IID obligations after a DUI conviction in California, and they operate on different timelines through different processes.
The court may order an IID as a condition of probation when it sentences you. That condition is part of your criminal case, and violating it is a probation violation with consequences handled through the criminal process.
The DMV may also place an IID restriction on your driver's license through its own administrative process, independent of the criminal court. The restriction governs when and how you may drive during the monitoring period. The specific terms, including which vehicles it covers and what exceptions may apply, are set by the DMV based on your offense and record. If you have questions about what the restriction permits in your situation, confirm with the DMV or a DUI attorney before driving.
Devices must be certified by the California Department of Justice under Title 17 of the California Code of Regulations. BACtrack Drive is certified under this program and authorized to operate in California.
One important distinction: attorneys sometimes negotiate an IID condition in lieu of a license suspension. If a full suspension would significantly affect your employment or family obligations, this is worth raising with counsel before sentencing.
BACtrack Drive handles DMV verification and paperwork for the installation process so drivers can focus on completing the requirement.
How to Get an IID Installed in California
The installation process follows a set sequence. Working through it in order avoids administrative delays.
Step 1: Contact the DMV. After your conviction is entered, contact the California DMV to initiate the IID process. The DMV will communicate the requirement and next steps based on your case.
Step 2: Choose a California DOJ-certified provider. Only devices and service centers certified under Title 17 are authorized for use in California. BACtrack Drive operates certified installation centers across the San Francisco Bay Area and Sacramento region.
Step 3: Schedule and complete installation. The installer connects the device to the vehicle's ignition and electrical system, calibrates it, confirms it is functioning correctly, and reviews the testing protocol with you before you leave. Plan for a same-day appointment.
Step 4: Submit your Certificate of Installation to the DMV. The installer issues a Certificate of Installation at the end of the appointment. Submit it to the DMV per their instructions to begin the administrative process for activating your IID restriction.
Step 5: Return for calibration every 60 days. California requires calibration at minimum every 60 days. At each calibration visit, the provider downloads your compliance data and submits it to the DMV. The monitoring period generally does not begin until the device is installed and the DMV has processed your documentation; confirm the start date with your provider and the DMV.
Cost overview. BACtrack Drive charges $99 per month. Installation, calibration visits, and removal are included with no additional fees. For a standard six-month requirement, the total cost with BACtrack Drive is $594. Across providers, total costs vary; combined fees for installation, monthly lease, calibration, and removal can range from $500 to over $1,000 for a six-month program. If cost is a hardship, California offers financial assistance through the IID Reduced Fee Assistance for qualifying low-income individuals. BACtrack Drive can verify eligibility and handle the application at scheduling.
What Counts as a Violation During the IID Period
Understanding what the device flags and how those events are recorded protects you from unintentional violations. Every event the device records is submitted to the DMV as part of your compliance record.
Failed startup test. Before the engine starts, the device requires a breath sample. If your BAC level registers at or above the device's preset threshold, the vehicle will not start. A failed startup test is recorded as a failed chemical test in your compliance record.
Missed rolling retest. After the engine starts, the device will prompt you to provide a breath sample while driving at randomized intervals. A missed or failed rolling retest is logged and submitted to the DMV.
Circumvention and tampering. Attempting to bypass the device or having another person provide a breath sample on your behalf is classified as circumvention. Noncompliance of this kind is reported to the court or DMV and certain violations can trigger immediate license suspension or revocation. Circumvention may also constitute a probation violation. An attorney can advise on the specific consequences in your case.
Missed calibration. Missing a scheduled calibration appointment can interrupt the documentation chain the DMV uses to confirm your compliance. Noncompliance identified during the calibration process may be reported to the DMV and can affect your driving privilege. Confirm your provider's reporting obligations with them directly.
BACtrack Drive tracks your calibration schedule and sends reminders ahead of each appointment to help you stay on track with the DMV's reporting requirements.
How Long the Requirement Lasts and How It Ends
The monitoring period generally begins when the device is installed and the DMV has activated the IID restriction on your license. Confirm the start date with your provider and the DMV so you have an accurate end date. Early removal is not available under standard California law for most driving under the influence convictions.
To end the requirement, follow these steps in order.
Step 1: Verify your eligibility with the DMV. Confirm your IID term is complete through the California DMV's Mandatory Actions Unit. Your installer can contact the unit directly for verbal confirmation, or submit Form DL 925 and await written approval. Initiate this step early as it can take several business days to a few weeks.
Step 2: Schedule your removal appointment. Once the DMV confirms eligibility, contact BACtrack Drive to schedule removal. The technician will disconnect the hardware, perform a final data download for the DMV, and provide a removal certificate.
Step 3: Update your driver's license. Verify that BACtrack Drive has submitted your completion report to the DMV, then request a replacement license with the IID restriction removed through the DMV online portal or at a local office. Processing typically takes two to four weeks.
If you move out of state or do not own a vehicle: Confirm with the DMV or an attorney what applies to your situation before driving.
If you are beginning the IID requirement in the San Francisco Bay Area, Alameda, or Sacramento region, BACtrack Drive handles installation, calibration, and removal in one place. See if BACtrack Drive serves your area.
Frequently Asked Questions
Does my IID restriction apply to every car I drive?
The IID restriction on your license generally governs the vehicles you may operate during the monitoring period. The specific terms (including whether exemptions apply for employer or work vehicles) depend on how the DMV has issued the restriction in your case. Confirm with the DMV what the restriction covers before driving any vehicle you do not own.
What happens if I drive without an IID during my restriction period?
Driving in a way that violates the terms of your IID restriction may constitute a violation of your DMV restriction and, if you are on probation, a potential probation violation. The specific consequences depend on how the court and DMV treat the violation in your case. An attorney can advise on the applicable rules and penalties.
Does a sober passenger blowing into my device for me count as tampering?
Yes. Having any other person provide a breath sample to bypass the startup or rolling retest requirement is classified as circumvention. The device records samples; providers are trained to flag patterns inconsistent with self-testing. Circumvention may result in extended IID requirements and can constitute a probation violation.
Will alcohol in mouthwash or food affect my breath test result?
Mouthwash containing alcohol can produce a brief elevated reading if used immediately before a test. As a general precaution, wait at least 15 minutes after eating, drinking, or using any oral product before completing a startup or rolling retest. This is not a statutory requirement under California law; it is a practical step to avoid an inaccurate reading. If you receive a failed result you believe was caused by a residual substance, complete a second test after waiting, and document what you consumed and when. Bring that documentation to your next calibration appointment.
Can the IID requirement be modified for a medical condition?
California has a DMV medical exemption process for individuals whose medical condition affects their ability to provide an accurate breath sample. This is distinct from a general hardship waiver. The exemption requires formal documentation and must go through the DMV. An attorney with experience in California DUI law can advise on whether you qualify and how to initiate the process.
How do I remove the IID and get the restriction off my license?
Start by confirming eligibility with the California DMV's Mandatory Actions Unit before scheduling anything. Your installer can contact the unit directly for verbal confirmation, or submit Form DL 925 and await written approval. Initiate this early as it can take several business days to a few weeks. Once the DMV confirms eligibility, contact BACtrack Drive to schedule the removal appointment. The technician will disconnect the hardware, perform a final data download for the DMV, and provide a removal certificate. After removal, verify that BACtrack Drive has submitted your completion report to the DMV, then request a replacement license with the IID restriction removed through the DMV online portal or at a local office. Processing typically takes two to four weeks.
Does BACtrack Drive serve San Diego County and Imperial Valley?
BACtrack Drive currently serves drivers in the San Francisco Bay Area and Sacramento region. Drivers in San Diego County and Imperial Valley who are beginning an IID requirement should contact BACtrack Drive directly at drive.bactrack.com to confirm current service availability in their area.
What is a breath alcohol ignition interlock device and what does it measure?
A breath alcohol ignition interlock device is a court- and DMV-recognized testing unit wired into your vehicle's ignition system. Before the engine starts, it requires a breath sample and measures your breath alcohol concentration. If the reading is at or above the device's preset threshold, the vehicle will not start. Results are logged and submitted to the DMV as part of your compliance record. At the end of your monitoring period, your provider issues a Notice of Completion Certificate confirming you have satisfied the requirement. Submit that certificate to the DMV to have the IID restriction removed from your license.
References
- California Legislature. "Vehicle Code Section 23575." leginfo.legislature.ca.gov. Accessed June 2026.
- California DMV. "DUI and Your Driving Privilege." dmv.ca.gov. Accessed June 2026.
- California Office of the Attorney General. "IID Certification." oag.ca.gov. Accessed June 2026.
- California DMV. "IID Assistance Program." dmv.ca.gov. Accessed June 2026.
- BACtrack Drive. "Ignition Interlock Service." drive.bactrack.com. Accessed June 2026.
