Driving without a license and being in an accident are normally two different offenses and will be dealt with separately. Just because you were driving without a license does not automatically make you responsible for an accident. However whether you were at fault or not you can be cited for driving as an unlicensed driver.
In Pennsylvania, no person may drive any motor vehicle upon a highway or public property without a driver's license valid under the PA Motor Vehicle Code. Pennsylvania MVC chapter 15 explains that public property includes, but is not limited to, driveways and parking lots owned or leased by the Commonwealth or an agency thereof.
Again according to the PA MVC chapter 15, if a person drives without a valid license in Pennsylvania, they are guilty of a summary offense and upon conviction shall be sentenced to pay a fine of $200.
Driving with a revoked or suspended license or a second or additional offense of driving without a valid license within a 5 year period will result in your Pennsylvania driving privileges being suspended or revoked for a lengthier period of time.
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If you were at fault in an accident and cited for a specific traffic violation, such as running a red light, in association with the accident then you would have separate penalties for that offense. You would also need to check with your auto insurance company to see if they would cover the accident if you without a valid license at the time of the incident. If they are able to decline claims arising from this accident then you would likely be held personally responsible.
PennDOT should be able to answer more questions about the penalties associated with being an unlicensed driver and being in an automobile accident. If you were cited for this offense the court listed on your citation should also be able to give you information about the possible penalties. | 
