PennDOT Form DL-3731: Ignition Interlock License Application

PennDOT Form DL-3731: Ignition Interlock License Application – Drivers in Pennsylvania who must install an ignition interlock device after a DUI-related suspension or who have completed their required interlock period use PennDOT Form DL-3731. Officially titled “Application for Ignition Interlock License / Return of Regular Driver’s License,” this form is the key document for obtaining a restricted Ignition Interlock License or for restoring full driving privileges once the interlock requirement ends.

This guide explains who needs the form, how to complete it correctly, current fees, mailing addresses, and official resources so Pennsylvania residents can navigate the process efficiently.

What Is PennDOT Form DL-3731?

Form DL-3731 is the official Pennsylvania Department of Transportation (PennDOT) application used for two primary purposes:

  • Applying for an Ignition Interlock License (a limited license that allows driving only vehicles equipped with an approved ignition interlock device)
  • Requesting the return of a regular (unrestricted) driver’s license after successfully completing the required ignition interlock period

The form also covers situations involving commercial driver’s license (CDL) disqualifications where a non-commercial ignition interlock license is needed. The current version is marked DL-3731 (7-25).

You can download the official form directly from PennDOT here: Download PennDOT Form DL-3731 (PDF).

Who Needs to File Form DL-3731?

Pennsylvania law requires an ignition interlock device for:

  • First-time DUI offenders with high blood alcohol concentration (BAC)
  • Repeat DUI offenders
  • Drivers who refuse chemical testing
  • Individuals convicted of operating a vehicle without a required interlock device

Approximately 30 days before your restoration eligibility date, PennDOT mails a Restoration Requirements Letter that includes Form DL-3731 (or directs you to obtain it). The same form is later used when the interlock period ends so you can apply for an unrestricted license.

Even if you do not own a vehicle, you must still obtain an Ignition Interlock License. In that case, an approved vendor certifies non-ownership.

Three Application Options on Form DL-3731

Section B of the form requires you to select only one option:

  • Option 1 – Applying for an ignition interlock license
  • Option 2 – Applying for a non-commercial class ignition interlock license due to commercial driving privilege disqualification (Section 1617 of the Pennsylvania Vehicle Code)
  • Option 3 – Applying for return of your previous classification after the ignition interlock period has been served

If you select Option 3, you must answer whether you received any citations for driving without an interlock device or tampering with the device during the interlock period. Failure to answer delays processing.

Note: If you are returning a previous CDL classification, you must also complete Form DL-100CD.

How to Complete Form DL-3731 Step by Step?

Follow these sections carefully:

  • Section A – Applicant Information: Enter your driver’s license number, full name, date of birth, eye color, telephone number, email, and current address. Update your address if needed. A P.O. Box cannot be the sole address.
  • Section B – Application Options: Check only one box as described above.
  • Section C – Request for Exemption from Photo (optional): Use this only if you will be absent from Pennsylvania for an extended period.
  • Section D – Authorization and Certification: Sign and date the form. You may optionally add a veterans designation, contribute $3 to the Organ Donation Awareness Trust Fund, or $5 to the Veterans’ Trust Fund.

Print or type all information in blue or black ink. Incomplete or unsigned applications will be returned.

Required Fees for Form DL-3731

According to the current form and PennDOT fee charts (as of the July 2025 version):

  • Driver’s License without Class M: $42.50
  • Driver’s License with Class M: $48.50

These fees cover the issuance of the license product. Additional restoration fees may apply depending on your specific suspension. If your license expires within six months, you may attach a renewal application (DL-143 or DL-143CD) and pay only the renewal fees at the same time.

Payment must be by check or money order payable to “PennDOT.” Driver License Centers do not accept cash for this application. Optional contributions to the Organ Donation or Veterans’ Trust Funds must be added to the total payment and clearly indicated on the form.

For the most current fee schedule, visit the official PennDOT Payments and Fees page.

Where to Mail Completed Form DL-3731?

Mailing addresses differ by option:

  • Options 1 and 2:
    Department of Transportation
    Bureau of Driver Licensing
    P.O. Box 68693
    Harrisburg, PA 17106-8693
  • Option 3 (return of regular license):
    Department of Transportation
    Bureau of Driver Licensing
    P.O. Box 68273
    Harrisburg, PA 17106-8273

Always include the correct fee. Using certified mail is recommended for tracking.

Additional Requirements for Ignition Interlock Licenses

Submitting DL-3731 alone is not enough. You must also:

  • Complete all restoration requirements listed in your PennDOT letter (fees, alcohol education, treatment, etc.)
  • Have an approved ignition interlock device installed in every vehicle you will operate (or obtain non-ownership certification)
  • Submit Form DL-21SC (Self-Certification of Vehicle(s) to Be Operated or Inoperable)
  • Ensure the interlock vendor electronically notifies PennDOT of installation or non-ownership

Approved vendors are listed on the Pennsylvania DUI Association website. Approximate annual lease and monitoring costs range from $900 to $1,300, paid directly to the vendor.

Returning to an Unrestricted License After the Interlock Period

Near the end of your one-year interlock period, PennDOT typically mails another DL-3731 form. You must also have your interlock vendor submit a Declaration of Compliance confirming no reportable incidents (generally in the final two consecutive months, or 30 days for certain ARD cases).

Only after PennDOT receives both the completed DL-3731 and the Declaration of Compliance will an unrestricted license be issued.

Official Resources and Related Forms

Always use the most recent version of forms from official sources:

For questions, contact PennDOT Customer Service at 717-412-5300 or visit a Driver License Center after confirming requirements online.

Tips for a Smooth Application Process

  • Download the latest form version directly from pa.gov to avoid outdated paperwork.
  • Double-check that you selected only one application option and answered all required questions.
  • Keep copies of everything you mail, including proof of payment.
  • Coordinate closely with your chosen interlock vendor—installation certification is essential.
  • Monitor your mail for the Restoration Requirements Letter and Declaration of Compliance notices.
  • If your address has changed, update it promptly through PennDOT to avoid missed correspondence.

Completing Form DL-3731 correctly and on time is a critical step toward regaining legal driving privileges in Pennsylvania. Always verify the latest requirements on the official PennDOT website, as fees and procedures can be updated.

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