Lending a Car Without an Ignition Interlock in Arizona: HB 2800 and Class 6 Felony Risk

Effective September 12, 2026 · House Bill 2800, Chapter 259 (signed June 22, 2026)

Disclaimer: This Guide is for general information only. It is not legal advice and does not create an attorney-client relationship. Arizona traffic and criminal laws turn on specific facts.

If a friend or family member is on an Arizona ignition interlock restriction after a DUI-related case, handing them the keys to a car that does not have a working certified ignition interlock device is no longer just a “helping out” moment. Under HB 2800, that choice can become a class 6 felony if a crash later causes death or serious physical injury.

This Guide is for people who might lend a vehicle, people already facing a charge under A.R.S. § 28-1464, and families navigating interlock rules. It is not for pure civil traffic tickets with no criminal allegation, and it is not a substitute for advice on your exact facts.

Why the clock matters: the law took effect September 12, 2026. Conduct after that date is judged under the new felony upgrade. Knowledge, emergency, and injury disputes all move fast. Waiting until arraignment can close options.

Who this Arizona ignition interlock lending rule reaches

A.R.S. § 28-1464 already barred (except in a substantial emergency) knowingly renting, leasing, or lending a motor vehicle to someone with a limited driving privilege under §§ 28-1381, 28-1382, 28-1383, or 28-3319, or a restricted privilege under § 28-1402, unless the vehicle has a functioning certified ignition interlock device.

HB 2800 keeps the baseline: most violations of that section remain a class 1 misdemeanor. The new piece is the upgrade in subsection K:

• You knowingly lend a motor vehicle in violation of subsection A; and

• While the other person operates that vehicle, they are involved in a collision that results in death or serious physical injury as defined in A.R.S. § 13-105; then

• The person who knowingly lent the vehicle is guilty of a class 6 felony.

“Serious physical injury” under § 13-105 includes injury that creates a reasonable risk of death, causes serious and permanent disfigurement, seriously impairs health, or causes loss or protracted impairment of an organ or limb’s function. Whether a crash injury meets that line is often contested with medical records, not settled by a news headline.

Checklist: what Arizona law looks at

1. Knowledge. Did the lender know the driver had a limited or restricted privilege that required a certified ignition interlock?

2. Vehicle equipment. Was the car lent without a functioning certified ignition interlock device?

3. Exception. Does a substantial emergency apply (another driver not reasonably available to respond to an emergency)?

4. Outcome of the drive. Crash with death or serious physical injury while the borrower operated the car means felony exposure for the lender under the new language.

5. Related § 28-1464 issues. Circumventing a device, breathing into someone else’s interlock, operating without the required device, and notice failures still carry criminal risk; some convictions also trigger an interlock-requirement extension of up to one year.

Who this might help, and who it won’t

Might help: family members who lent a spare car “just this once”; friends charged after a crash involving an interlock-restricted driver; anyone deciding whether to plead to a class 1 misdemeanor before a felony theory is fully developed.

Won’t fix by itself: a driver who was intoxicated and caused the crash (separate DUI and homicide statutes still apply to that person); cases with no knowledge of the restriction; situations that clearly fit the emergency exception on undisputed facts.

Why counsel matters on an HB 2800 / § 28-1464 case

A class 6 felony is not a traffic citation. Knowledge, emergency, causation, and whether injuries meet § 13-105 are fact-heavy. Prosecutors may also charge the driver under other Title 28 or Title 13 statutes at the same time. Those pieces affect bail, plea structure, licensing and long-term fallout, and whether a misdemeanor resolution is even available.

Sun Valley Law Firm represents people across Arizona in criminal-defense matters, including DUI-related and Title 28 cases. Based in Gilbert with a Valley focus, we also appear in courts statewide. If you lent a vehicle, received a summons, or are being pressed to “just plead to the misdemeanor,” have a lawyer review the charging language, the crash evidence, and what the State must prove under § 28-1464 before you lock in a record. Related: After a DUI arrest.

Sources: Laws 2026, Ch. 259 (HB 2800); A.R.S. §§ 28-1464, 13-105. Not legal advice.

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