Pennsylvania 3802 DUI Law: Tiers, Penalties, and Interlock

Pennsylvania DUI penalties by BAC follow a three-tier structure under 75 Pa. C.S. § 3802, with fines, jail time, and license suspensions climbing sharply at each tier and again for each prior offense within a ten-year window. A first-time driver at 0.08% pays a $300 fine and serves probation. A driver at 0.16% or higher on a third offense is looking at a first-degree misdemeanor, at least a year in prison, and an 18-month license suspension.¹

How Pennsylvania Groups DUI by BAC

Every DUI charge falls into one of three tiers, and the BAC used for tier placement must come from a chemical test given within two hours of driving.²

General Impairment covers a BAC of at least 0.08% but less than 0.10%, or impairment proven without a specific BAC number.
High BAC covers a BAC of at least 0.10% but less than 0.16%.
Highest BAC covers a BAC of 0.16% or higher.

The gap between General Impairment and High BAC is only 0.02 percentage points, and it changes the sentence from probation to mandatory jail plus a year without a license.

What Pushes a Case Into the Top Tier Regardless of BAC

The Highest BAC tier does more than punish extreme intoxication. Under Section 3804, the same penalties apply if you refused a chemical breath or blood test, if you were convicted of driving under the influence of a controlled substance, or if you had a passenger under 18 in the vehicle at the time of the offense.¹ A driver who blew 0.09% with a 16-year-old in the back seat gets sentenced under the harshest tier, not the lowest.

Refusal carries a second punishment on top of the criminal sentence. PennDOT will suspend your license for 12 months for a first refusal, or 18 months if you have a prior DUI conviction or prior refusal suspension. That administrative suspension stacks on top of whatever the criminal court imposes.³

First Offense Penalties by Tier

Every first-time DUI conviction requires alcohol highway safety school and a court-ordered drug and alcohol assessment. Beyond that, the penalty depends on the tier.¹

General Impairment (0.08% to under 0.10%): Six months of probation and a $300 fine. No mandatory jail. No license suspension.
High BAC (0.10% to under 0.16%): A minimum of 48 consecutive hours in jail, fines of $500 to $5,000, and a 12-month license suspension.
Highest BAC (0.16% or higher, refusal, controlled substance, or minor in the vehicle): A minimum of 72 consecutive hours in jail, fines of $1,000 to $5,000, and a 12-month license suspension.

Second Offense Penalties by Tier

Pennsylvania uses a ten-year lookback to decide whether a DUI counts as a repeat. The clock runs from the current offense date back to the conviction date of the earlier one. Out-of-state DUI convictions for substantially similar offenses count.⁴

General Impairment: Minimum five days in jail, fines of $300 to $2,500, and a 12-month license suspension.¹
High BAC: Minimum 30 days in jail, fines up to $7,500, and a 12-month license suspension.
Highest BAC: Minimum 90 days in jail, fines of $1,500 to $10,000, and an 18-month license suspension.⁵

Third and Subsequent Offense Penalties by Tier

General Impairment: Minimum ten days in jail and a 12-month license suspension.
High BAC: Minimum 90 days in jail, an 18-month license suspension, and fines of $1,500 to $10,000.⁵
Highest BAC: First-degree misdemeanor. Minimum one year in prison, fines of $2,500 to $10,000, and an 18-month license suspension.⁶

When a DUI Becomes a Felony

Two situations move a DUI out of misdemeanor territory. A fourth or subsequent DUI within ten years is graded as a third-degree felony regardless of BAC tier, carrying longer prison exposure and higher maximum fines than any misdemeanor DUI.²

The other path is a fatal crash. Under Section 3735, an impaired driver who unintentionally causes a death faces a second-degree felony with a mandatory minimum of three years in prison per victim killed, and sentences run consecutively. A driver with one prior DUI or prior vehicular homicide faces a first-degree felony with a five-year minimum per victim. A driver with two or more prior convictions faces a seven-year minimum per victim. Sentencing guidelines cannot reduce these minimums.⁷

Ignition Interlock

Interlocks are required for all first-time offenders sentenced under the High BAC or Highest BAC tiers and for all repeat DUI offenders. The device must remain installed for one year from the date your license is restored, and during that year every vehicle you operate must have one.⁸ The driver pays for installation, monthly lease, and calibration, which together run roughly $800 to $1,200 over the year.

ARD as a First-Offense Off-Ramp

Accelerated Rehabilitative Disposition is a pretrial diversion program. Complete it and the charges are dismissed and the arrest record expunged. For a first-time offender the reduction in license suspension alone is significant: no suspension if your BAC was below 0.10%, a 30-day suspension between 0.10% and 0.16%, and a 60-day suspension at 0.16% or higher, for drug-related DUI, or for refusal cases. A standard conviction at those higher tiers would cost 12 months.

You are ineligible for ARD if any of the following applies:⁹

You have a prior DUI conviction within the past ten years.
You have previously been placed in or completed an ARD program.
Someone other than you suffered serious bodily injury in the DUI crash.
A passenger under 14 was in your vehicle at the time of the offense.

Admission is at the district attorney’s discretion even when you meet the baseline. Participants complete court supervision (typically six to twelve months), community service, alcohol highway safety school, a drug and alcohol assessment, and payment of all costs and fees. Failing out of ARD sends the case back to the trial docket with the standard penalties waiting.

Different Thresholds for Drivers Under 21 and CDL Holders

The tiers above assume the standard 0.08% legal limit, and two groups of drivers do not get that limit. Drivers under 21 are charged under Section 3802 at a BAC of 0.02% or higher, and any adult tier still applies at its normal threshold if the underage driver reaches it.²

Commercial driver’s license holders operate under a federal 0.04% threshold. A first DUI conviction disqualifies a CDL for at least one year; a second disqualifies for life. Refusing a chemical test carries the same one-year disqualification as a conviction.¹⁰¹¹

1
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3804 – Penalties
2
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3802 – Driving Under Influence of Alcohol or Controlled Substance
3
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 1547 – Chemical Testing to Determine Amount of Alcohol or Controlled Substance
4
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3806 – Prior Offenses
5
Commonwealth of Pennsylvania. DUI Legislation
6
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3804 – Penalties
7
Pennsylvania General Assembly. Pennsylvania Code Title 75 – Section 3735 – Homicide by Vehicle While Driving Under Influence
8
Commonwealth of Pennsylvania. PennDOT Ignition Interlock Fact Sheet
9
Commonwealth of Pennsylvania. DUI Arrest in Pennsylvania
10
FMCSA. Driver Disqualified for Driving a CMV While Off-Duty With a Blood Alcohol Concentration Over 0.04 Percent
11
FMCSA. Disqualification of Drivers (383.51)