OBD-II fault code library | AutoUncover

Browse all OBD-II / SAE J2012 fault codes. Look up what each P, C, B and U code means.

Common fault codes

  • P0300
  • P0420
  • P0171
  • P0455
  • P0401
  • P0301
  • P0135
  • P0500
  • P0700
  • P0128
  • P0174
  • P0302
  • P0303
  • P0304
  • P0442
  • P0457
  • P0496
  • P0521
  • P0562
  • P0607
  • P0720
  • P0730
  • P0750
  • P0777
  • P0850
  • P2096
  • P2195
  • U0100