The P0219 OBDII fault code basically indicates that the PCM (Powertrain Control Module) has found RPM (Revolutions Per Minute) level is above the maximum level.
To determine if an overspeed condition exists, the vehicle’s computer uses the input signals from the CKP (Crankshaft Position Sensor) and CMP (Camshaft Position Sensor). In most cases, this condition is automatically checked by a rev limiting device once the transmission is in neutral.
When such a condition is found, fuel injection and ignition timing may be limited to decrease the engine RPM until the engine RPM returns to an acceptable level. If the PCM fails to return the RPM to acceptable levels, the P0219 code will be set.