B0020 is an issue with the airbag in the driver's seat. B0020-00 is not a valid code. Valid codes would be:
B0020-11 (Short to Ground)
B0020-12 (Short to Power)
B0020-13 (Open or Increased Resistance)
B0020-1A (Decreased Resistance)
There is something wrong with the wiring leading to the driver seat airbag, or the airbag is defective.