CA Vehicle Code 23152(a): Penalties, DMV Action, and Costs

California Vehicle Code section 23152(a) makes it illegal to drive while under the influence of an alcoholic beverage, and it is the charge prosecutors file most often in DUI cases. The law has no built-in BAC number. Unlike section 23152(b), which triggers automatically at a blood alcohol concentration of 0.08%, section 23152(a) asks whether alcohol actually impaired your ability to drive with the caution of a sober person exercising ordinary care.¹ That means you can face this charge even below 0.08% if the officer’s observations point to impairment, and you can be charged under 23152(a) alongside 23152(b) from the same arrest.

What the Law Says

The statutory text is short: it is unlawful for a person who is under the influence of any alcoholic beverage to drive a vehicle.² “Under the influence” is defined by California’s jury instruction as a level of alcohol-caused mental or physical impairment that prevents you from driving with the caution of a sober person under similar circumstances.¹ It is a behavioral standard, not a chemical one.

Prosecutors routinely charge 23152(a) and 23152(b) together from a single arrest. A jury can convict on both, but California law forbids punishment for more than one offense arising from the same act of driving, so the court enters judgment on one count and stays the sentence on the other. The two charges serve different purposes. If the chemical test comes back at 0.06%, 23152(b) drops away but 23152(a) can still stand on the officer’s observations. If the driver blew well above 0.08% but drove without incident, 23152(b) carries the case.

One boundary worth clearing up: 23152(a) covers alcohol only. Driving under the influence of a drug is charged under 23152(f), and combined alcohol-and-drug impairment falls under 23152(g).²

What the Prosecution Has to Prove

Two elements, both beyond a reasonable doubt: that you drove a vehicle, and that you were under the influence of alcohol when you drove.¹

The driving element requires actual movement of the vehicle, not mere physical control. Sitting behind the wheel of a parked car with the engine running does not, by itself, satisfy this element. Sometimes the evidence is direct, like an officer watching you drive. Sometimes it is circumstantial: a warm engine, keys in the ignition, no other plausible driver at the scene.

The impairment element is where the case is usually won or lost. Because there is no BAC threshold in 23152(a), the prosecution stacks circumstantial evidence. The jury instruction notes that driving pattern alone is not enough, but it is one factor among many.¹ Common evidence includes:

Driving behavior such as weaving, delayed braking, running stop signs, or wide turns.
Physical signs like bloodshot or watery eyes, slurred speech, unsteady balance, the odor of alcohol, and flushed skin.
Field sobriety tests, including the walk-and-turn, one-leg stand, and horizontal gaze nystagmus.
The roadside preliminary breath test, which produces an approximate BAC and helps establish probable cause but carries less weight than the station chemical test.
Statements and behavior at the scene: admissions about drinking, fumbling for license and registration, confusion, difficulty exiting the vehicle.

If the formal chemical test comes back at 0.08% or higher, the jury is allowed, but not required, to infer that you were under the influence.¹ That optional inference is why a 23152(a) charge often survives even when the defense attacks the accuracy of a breath or blood result.

Penalties for a First Conviction

A first-time DUI under section 23152 is a misdemeanor. The court-imposed penalties are separate from the DMV’s license action.

Jail

The statute requires a minimum of 96 hours in county jail, at least 48 of them consecutive, with a six-month maximum.³ In practice, most first offenders receive three to five years of informal probation, and courts often allow jail time to be served around a work schedule.

Fines

The base fine runs from $390 to $1,000.³ That base is only the starting point. California adds penalty assessments, a 20% state surcharge, court security fees, conviction assessments, and DUI-specific fees on top. The state and county add roughly $29 for every $10 of the base fine. A $390 base fine typically produces a total bill between $1,800 and $2,600 depending on the county. A $1,000 base fine can push past $4,000.

DUI Education Program

Enrollment in a state-licensed DUI program is a condition of probation. Program length depends on your BAC:⁴

BAC below 0.20%: a three-month program of at least 30 hours of education, group counseling, and individual interviews.⁵
BAC of 0.20% or higher, or a chemical test refusal: a nine-month program of at least 60 hours.⁴

Failing to enroll, attend, or complete the program is grounds for the court to revoke probation.⁴

The DMV Action Runs Separately

The DMV’s Administrative Per Se process is not part of the criminal case. It targets your driving privilege and moves on its own timeline no matter what happens in court.⁶

At the arrest, the officer takes your physical license and gives you a pink temporary license that is also a notice of suspension. It is valid for 30 days. When those 30 days end, the suspension takes effect automatically unless you act.⁶

You have 10 days from the date of arrest to contact the DMV and request an Administrative Per Se hearing.⁶ Miss that window and you lose the right to challenge the suspension. Many people miss it because they assume the criminal case is the only thing to worry about.

The hearing itself is narrow. It is not a trial on guilt. The DMV hearing officer looks at three questions: whether the officer had reasonable cause to believe you were driving under the influence, whether the arrest was lawful, and whether you were driving with a BAC of 0.08% or higher or refused a chemical test.⁶

If the suspension is upheld for a first offense, you lose your license for four months. You can apply for a restricted license or an IID-restricted license after serving an initial 30-day hard suspension during which no driving is allowed.⁶

Refusing the Chemical Test

California’s implied consent law means that by driving on a California road you have already agreed to submit to a chemical test of your blood or breath if you are lawfully arrested for DUI.⁷ The officer must advise you of the consequences before you decide.

Refusal carries heavier consequences than taking the test and failing:

A refusal also bumps a convicted first offender from the three-month DUI program to the nine-month version.⁴ And the refusal itself can come in as evidence at trial, with the prosecution arguing you refused because you knew you were intoxicated.

The roadside preliminary breath screening device is a separate matter. Drivers over 21 who are not on DUI probation can decline the preliminary screening without triggering these penalties. The post-arrest chemical test at the station is not optional.

Keeping Some Ability to Drive

For a first DUI conviction without injury, an ignition interlock device is not automatically required. The court has discretion to order one for up to six months.⁹ If the court does not order one, you have two paths: apply voluntarily for an IID-restricted license for up to six months, or apply for a narrower restricted license that only permits driving to and from work and your DUI program for one year.¹⁰ The IID route gives more freedom because it allows you to drive anywhere; the narrower restricted license does not.

An IID is a breathalyzer wired into the vehicle’s ignition. You blow into it to start the car and at random intervals while driving. Any detected alcohol either prevents the car from starting or logs a violation that gets reported. Installation and monthly monitoring are paid out of pocket.

Insurance After a Conviction

California requires you to file an SR-22 certificate of financial responsibility and maintain it for three years.¹¹ The SR-22 is not a policy. It is a form your insurance company files with the DMV guaranteeing that you carry at least state-minimum liability coverage. If your policy lapses or is canceled while the SR-22 is active, your insurer notifies the DMV and your license is suspended again.

The filing fee is small, typically $15 to $50. The premium increase is not. Rates after a DUI conviction commonly rise 50% to over 100% and stay elevated for at least the three years the SR-22 is required. Some insurers will drop DUI-convicted drivers entirely, forcing them into high-risk coverage. Over three years, the added insurance cost often exceeds the fines and court fees combined.

When the Stakes Go Up

California counts prior DUI convictions within a 10-year lookback window, and penalties climb quickly.¹² A second conviction brings a two-year license suspension and a mandatory one-year IID. A third brings a three-year revocation and a two-year mandatory IID. Minimum jail time rises to 96 hours to one year for a second offense and 120 days for a third. A fourth DUI within 10 years can be charged as a felony. Unlike the first-offense IID, the requirement is mandatory rather than discretionary for repeat offenders.

Commercial driver’s license holders face a separate federal hit. A first DUI conviction or chemical test refusal disqualifies a CDL holder from operating a commercial vehicle for one year, and three years if hauling hazardous materials. A second DUI conviction is a lifetime disqualification.¹³ These federal penalties apply on top of the California action, and commercial drivers are held to a lower 0.04% BAC threshold when operating a commercial vehicle.

Adding Up the Real Cost

The fine on the sentencing sheet is only part of the bill. Add the assessment-inflated fine ($1,800 to $4,000+), the DUI program ($500 to $1,000), three years of SR-22-era insurance surcharges, possible IID installation and monitoring, private attorney fees (commonly $2,000 to $10,000 for a first offense), and lost wages from court dates and jail, and a first-offense DUI in California typically lands between $10,000 and $15,000 all in. That figure does not include career consequences, professional licensing complications, or the insurance premium bump that lingers past the three-year SR-22 window.

1
Justia. California Criminal Jury Instructions – CALCRIM No. 2110 Driving Under the Influence
2
California Legislative Information. California Code VEH 23152 – Offenses Involving Alcohol and Drugs
3
California Legislative Information. California Code VEH 23536 – First Offense Penalties
4
California Legislative Information. California Code VEH 23538 – Conditions of Probation for First Offense
5
California Department of Health Care Services. DUI Programs
6
California Department of Motor Vehicles. Driving Under the Influence
7
California Legislative Information. California Code VEH 23612 – Chemical Testing of Blood or Breath
8
California Legislative Information. California Code VEH 13353 – Suspension for Chemical Test Refusal
9
California Legislative Information. California Code VEH 23575.3 – Ignition Interlock Device
10
California Department of Motor Vehicles. Statewide Ignition Interlock Device Pilot Program
11
California Department of Motor Vehicles. DUI First Offenders Alcohol Involved – Non-Injury 21 and Older
12
California Department of Motor Vehicles. DUI Repeat Offenders Alcohol Involved 21 and Older
13
eCFR. 49 CFR 383.51 – Disqualification of Drivers