Ignition interlock requirements after a North Carolina DWI
Who may be required to install an interlock, what the .02 restriction means, and how limited privileges and license restoration interact.
What an ignition interlock does
An ignition interlock device requires a breath sample before a vehicle can start and may require rolling retests. The provider records test results, attempts, lockouts and service events. North Carolina law can require interlock as a condition of a limited privilege or restored driving.
Common statutory triggers
G.S. 20-17.8 addresses ignition-interlock restrictions, including cases involving an alcohol concentration of 0.15 or more and certain repeat DWI convictions. The precise trigger, authorized vehicles, start date and required period should be confirmed from the judgment, restoration documents and current DMV record.
Installation is only one part of compliance
Before driving, confirm that the device is installed by an approved provider, the court order or DMV restriction is effective, insurance requirements are met, and every vehicle to be driven is authorized. Keep calibration appointments and retain records of repairs, medical issues or device problems.
High-BAC limited privileges
For an alcohol concentration of 0.15 or more, a waiting period and ignition-interlock limited privilege may apply under G.S. 20-179.3. Eligibility and timing are fact-specific. Other revocations—such as a refusal revocation—can prevent a privilege from becoming usable even when a judge signs it.
Frequently asked questions
Can I drive a work vehicle without interlock?
Only if a statutory exception and the controlling order or DMV restriction allow it. Do not assume an employer-owned vehicle is automatically exempt.
What if the device records a failed test?
Document the circumstances and contact counsel and the provider promptly. Do not ignore service notices or attempt circumvention.
Does installation automatically restore my license?
No. Installation is separate from the court order, DMV eligibility, insurance and other restoration requirements.