Is It Illegal to Leave a Child in a Car in California?

Yes, it is illegal to leave a child in a car in California if the child is six years old or younger and either the engine is running, the keys are in the ignition, or conditions pose a significant risk to the child’s health or safety. The rule comes from Vehicle Code 15620, better known as Kaitlyn’s Law. A basic violation is an infraction with a $100 fine, but if the child is injured, prosecutors can escalate the case to felony child endangerment carrying up to six years in state prison.¹

What the Law Actually Covers

Kaitlyn’s Law is narrower than most people assume. It applies to a parent, legal guardian, or other person responsible for a child aged six or younger, and it is triggered by either of two independent conditions: the engine is running or the keys sit in the ignition, or the situation presents a significant risk to the child’s health or safety.¹

Those triggers work separately. Engine running with a sleeping child on a cool day still violates the statute. Engine off on a 95-degree afternoon also violates it, because the conditions themselves create the risk.

Supervision has its own rule. A child left in the vehicle must be watched by someone at least 12 years old. A nine-year-old sibling does not count. The supervisor also needs to be at the vehicle, not inside a nearby store keeping an eye on things through the window.

If the child is seven or older, Vehicle Code 15620 does not apply. That doesn’t mean anything goes — child endangerment law under Penal Code 273a still reaches situations that put any minor in danger — but the specific $100 infraction is tied to the six-and-under age line.

The Basic $100 Fine

A straightforward violation is an infraction, not a misdemeanor, and the fine is $100.¹ The statute does not scale the fine for repeat offenses, so each violation carries the same amount.

The court can reduce or waive the fine if you show you are economically disadvantaged. In that case, the judge refers you to a community education program covering the dangers of leaving children in vehicles. Bring proof of completion back to court and the fine is dismissed. Even defendants who can pay may be ordered to attend the program at the judge’s discretion.¹

Because an infraction is not a criminal conviction in the traditional sense, a basic Kaitlyn’s Law ticket does not create the kind of record a misdemeanor or felony would. That protection disappears the moment the child is hurt.

When It Becomes Child Endangerment

The $100 infraction penalty is off the table if the unattended child is injured or receives medical services. Vehicle Code 15620 says so directly. Prosecutors can charge child endangerment under Penal Code 273a instead, or manslaughter under Penal Code 192 if a child dies.¹

Penal Code 273a is a wobbler, which means prosecutors choose between misdemeanor and felony based on the severity of the circumstances.

Felony child endangerment under 273a(a) applies when the circumstances are likely to produce great bodily harm or death. Punishment is up to a year in county jail or two, four, or six years in state prison. A child left in a hot car who develops heatstroke fits this category.²
Misdemeanor child endangerment under 273a(b) applies when the circumstances are not likely to cause great bodily harm but still put the child’s safety at risk. Punishment is up to six months in county jail.²

The gap between a $100 traffic infraction and a state prison sentence often turns on what happened to the child. A parent who runs into a gas station for two minutes on a mild day and returns to a ticket faces the infraction. A parent whose child is found overheated and lethargic after 45 minutes in direct sun faces felony charges. Prosecutors look at the actual danger, how long the child was alone, weather conditions, and whether the child suffered any harm.

Why California Enforces This Aggressively

Parked vehicles heat up faster than most drivers realize. A car’s interior can climb by about 40 degrees within an hour on a sunny day, with most of that rise happening in the first half hour, and outside temperature matters less than sun exposure. A child’s body temperature rises three to five times faster than an adult’s, heatstroke begins at a core body temperature around 104 degrees, and death occurs at 107 or above.³

More than 1,000 children have died of vehicular heatstroke nationally over the past 25 years. In 2024, 39 children died this way, a 35 percent increase from the year before.³ Over half of those deaths involved a caregiver who forgot the child was in the car. That pattern shapes how California courts and prosecutors treat these cases: the harm doesn’t require bad intent.

CPS Almost Always Gets Involved

A Kaitlyn’s Law stop rarely ends with the ticket. Law enforcement officers are mandated reporters under the Child Abuse and Neglect Reporting Act, codified in Penal Code sections 11165 through 11174.5.⁴ If a responding officer has reasonable suspicion of abuse or neglect, they must report it to child welfare. The reasonable suspicion standard is low and requires no medical evidence.

A report triggers a Child Protective Services investigation, which can include home visits, interviews with the child and other family members, and a review of prior reports. Even if the criminal side stays at the infraction level, a substantiated CPS finding of neglect can affect custody in a divorce, appear on background checks for jobs involving children, and prompt a family court to impose supervised visitation or modify custody orders.

Defenses and a Common Misconception

Because the statute has two specific triggers, a defense often shows neither was present. Engine off, keys out of the ignition, mild weather, and a parent standing at the trunk for 30 seconds is a situation where a lawyer can argue neither condition was met.

Emergency circumstances can also matter. If you left the child briefly to help someone in immediate physical danger, a court may weigh that urgency in deciding whether to impose a penalty.

One assumption that gets parents in trouble: leaving the air conditioning on is not a safe harbor. The statute is triggered when the engine is running, and a car with the AC on has its engine running. Running the AC may reduce the risk of a more serious child endangerment charge under Penal Code 273a, because the child is less likely to be in actual danger, but it does not shield you from the underlying infraction.¹

For a child endangerment charge under Penal Code 273a, the defense focuses on whether you acted with criminal negligence. Reasonable precautions, controlled conditions, and the absence of actual danger to the child all cut against the prosecution’s case. Most of these cases are won or lost on the distinction between a lapse in judgment and willfully placing a child in danger.⁵

If You See a Child Alone in a Locked Car

California law protects you if you break into a vehicle to rescue a child six or younger who is in danger. Civil Code 43.102 provides immunity from civil liability for property damage or trespass to a motor vehicle when someone rescues a child in that age range.⁶

The immunity has conditions. You must hold a reasonable belief the child faces immediate danger from heat, cold, lack of ventilation, or other circumstances that could cause suffering or death. You cannot use more force than necessary to enter the vehicle and remove the child. And you must stay with the child in a safe location until law enforcement or emergency responders arrive. Call 911 before or immediately after forcing entry, both for the child’s safety and to document that you acted reasonably. The protection covers civil liability only, so the safest course is always to call 911 first and let the dispatcher tell you whether to break the window or wait for an officer.

1
California Legislative Information. California Vehicle Code VEH 15620
2
California Legislative Information. California Penal Code PEN 273a
3
National Highway Traffic Safety Administration. Child Heatstroke Prevention: Prevent Hot Car Deaths
4
Child Welfare Information Gateway. Mandatory Reporting of Child Abuse and Neglect – California
5
Justia. CALCRIM No. 823 Child Abuse Misdemeanor
6
California Legislative Information. California Code Civil Code CIV 43.102