What does this OBD II code mean?  This generic OBD2 code is set when the Powertrain Control Module (PCM) detects that misfires are present in the engine but can’t identify the specific cylinder. This may indicate an intermittent problem. Why does this OBD II code appear? The PCM is constantly monitoring engine performance in order to optimize the air/fuel mixture and achieve the most efficient combustion possible. When misfires occur, the PCM tries to isolate the source (identifyi