Whether California will let you use an interlock device instead of suspension
California allows you to install an ignition interlock device (IID) instead of losing your license entirely, but only in specific situations and only after you meet certain conditions first. You cannot straightforward choose an interlock over suspension—the court or the Department of Motor Vehicles must authorize it, and the rules depend on why your license was suspended and whether this is your first offense.
If your suspension is for a DUI conviction, you may be able to get a restricted license that lets you drive to work, school, or medical appointments, but only if you install an IID in your vehicle. If your suspension is for other reasons—unpaid tickets, failure to appear in court, or medical reasons—an interlock device will not help you drive legally.
The key difference: an interlock does not restore your full driving privileges. It is a tool that may let you keep limited driving rights while serving part of your suspension period.
Key Takeaways
- An interlock device is only an option for DUI-related suspensions, not for suspensions caused by unpaid fines, failure to appear, or medical holds.
- You must first serve a minimum suspension period before you can request a restricted license with an interlock—you cannot skip the suspension entirely.
- The court must order the interlock as part of your DUI sentence, or the DMV must authorize it when you request a restricted license after your suspension period begins.
- You pay for the interlock device installation and monthly monitoring fees yourself, typically $60 to $150 per month depending on the provider.
- The interlock stays in your vehicle for the full period ordered by the court, usually 6 months to 3 years depending on your offense and prior history.
When the court orders an interlock as part of your DUI sentence
If you were convicted of driving under the influence, the judge may order you to install an interlock device as a condition of probation or as part of your sentence. This is separate from your license suspension—it is a requirement you must follow while your license is suspended or while you hold a restricted license.
The court order will specify how long the device must stay in your vehicle. For a first DUI offense in California, the typical period is 6 months. For a second offense within 10 years, it is usually 12 months. For a third or subsequent offense, it can be 24 to 36 months. If you refuse to install the device or tamper with it, you can face additional criminal charges and your restricted driving privileges will be revoked.
You must install the device at a California-certified provider. The DMV maintains a list of approved installers on its website. Once installed, you are responsible for all costs: installation (usually $50 to $200) and monthly monitoring fees ($60 to $150 per month).
How to request a restricted license with an interlock after suspension begins
If the court did not order an interlock but your license was suspended for a DUI, you can request a restricted license from the DMV after you have served a minimum portion of your suspension. This is called a "critical need restricted license" or "work restricted license," depending on your situation.
For a first DUI offense, you must serve at least 30 days of your suspension before you can request a restricted license. For a second offense within 10 years, you must serve at least 90 days. For a third or subsequent offense, you must serve at least 12 months. Once you have served the minimum, you can petition the DMV for a restricted license that allows you to drive only to work, school, medical appointments, or court-ordered programs—but only if you install an interlock device.
To request the restricted license, you will need to submit a form (usually the DL 44 or DL 44R) along with proof that you have installed the interlock device. You will also need to show proof of enrollment in a DUI education program if one was ordered. The DMV will review your request and either grant or deny it within a few weeks.
What happens if your suspension is not DUI-related
An interlock device will not help you if your license was suspended for reasons other than DUI. Common non-DUI suspension reasons include unpaid traffic fines, failure to appear in court, medical conditions, or accumulation of too many points on your driving record.
For these suspensions, your only option to restore driving privileges is to resolve the underlying issue: pay the fines, appear in court, obtain medical clearance, or wait out the suspension period. Installing an interlock device will not satisfy the DMV's requirements in these cases.
If you are unsure why your license was suspended, you can check your DMV record online through your account or by calling the DMV at 1-800-777-0133. The suspension notice you received by mail should also state the reason.
Interlock device requirements and costs
Once you decide to install an interlock device—either because the court ordered it or because you are requesting a restricted license—you must use a California-certified provider. The device itself is a small breathalyzer unit installed in your vehicle that requires you to blow into it before the engine will start. If the device detects alcohol above a set limit (usually 0.025%), the vehicle will not start.
Installation typically costs $50 to $200, depending on the provider and your vehicle type. Monthly monitoring and maintenance fees range from $60 to $150. Some providers charge a one-time calibration fee of $20 to $50. You are responsible for all these costs—the court or DMV will not pay them.
You must keep the device in your vehicle for the entire period ordered by the court, even if you later move out of state. If you remove it early or tamper with it, you can face criminal charges and your restricted license will be suspended again. You must also pass monthly check-ins where the device is inspected and data is downloaded to confirm you have not attempted to bypass it.
Common mistakes that can cost you your restricted license
Once you have a restricted license with an interlock device, you must follow the restrictions exactly. Driving outside the permitted times or locations—even once—can result in when ready revocation of your restricted license and reinstatement of the full suspension.
Other mistakes that can end your restricted driving privileges include failing to maintain the interlock device (missing a monthly service appointment), testing positive for alcohol on the device, attempting to tamper with or bypass the device, or accumulating new traffic violations. If any of these happen, you will lose your restricted license and must serve the remainder of your original suspension without any driving privileges.
You should also know that an interlock device does not erase your DUI conviction or reduce your insurance rates. Your insurance company will still charge you higher premiums for a DUI on your record, and the conviction will remain on your driving history for 10 years in California.
Timeline for getting from suspension to restricted license with interlock
The process takes several weeks from the time you install the device to the time you receive your restricted license. Here is the typical order of events:
- Serve the minimum suspension period (30 days for a first offense, 90 days for a second, 12 months for a third or more).
- Install the interlock device at a certified provider (same day or within a few days).
- Obtain proof of installation from the provider.
- Complete your DUI education program if one was ordered (usually 3 to 9 months depending on the program).
- Submit your restricted license request to the DMV with proof of interlock installation and program completion.
- Wait for DMV approval (typically 2 to 4 weeks).
- Receive your restricted license in the mail.
If you are in a hurry, some DMV offices allow you to explore in person and receive a temporary restricted license the same day, though you will still need to wait for the official card to arrive by mail. Call your local DMV office to ask if this option is available.
Frequently Asked Questions
Can I get a restricted license with an interlock if this is my first DUI?
Yes, but you must serve at least 30 days of your suspension first. After 30 days, you can request a restricted license from the DMV if you install an interlock device and complete a DUI education program. The restricted license will allow you to drive only to work, school, medical appointments, or court-ordered programs.
What if I cannot afford the interlock device fees?
The DMV and courts do not waive interlock fees, but some providers offer payment plans. You can also ask the court at your sentencing hearing whether it will reduce or waive the fee based on financial hardship. Some counties have programs that help low-income drivers pay for interlock costs, though these are not available everywhere.
Do I have to install the interlock in my own car, or can I use someone else's vehicle?
If you have a restricted license with an interlock requirement, you can only drive a vehicle with an interlock device installed. You cannot drive someone else's car without one, even if they give you permission. If you need to drive multiple vehicles, you must install an interlock in each one.
What happens if the interlock device malfunctions or I cannot get to a service appointment?
You must notify your interlock provider when ready if the device malfunctions. Most providers have emergency procedures and can schedule urgent repairs. If you miss a monthly service appointment without a valid reason, it will be reported to the DMV and can result in revocation of your restricted license. If you have a legitimate emergency, contact your provider and the DMV as soon as possible to explain.
Can I remove the interlock device early if I have not violated any rules?
No. The device must remain installed for the full period ordered by the court, regardless of your driving record during that time. Only the court can order early removal, and this is rare. You must complete the full term before you can request removal.