Are you sure that last one wasn't P-1693 (not P-01623)? If so, that's nothing to worry about... just the ECM indicating a DTC was set in the PCM or vise versa.
P-0460 FUEL LEVEL UNIT NO CHANGE OVER MILES
When Monitored: Engine running and fuel level either below 15% or above 85% of capacity.
Set Condition: The PCM sees low fuel, less than 15%, for more than 120 miles or fuel level does not change by at least 14% for more than 250 miles.
POSSIBLE CAUSES
PHYSICALLY DAMAGED/DEFORMED/OBSTRUCTED FUEL TANK
FUEL LEVEL SENSOR [failure]
P-0216 FUEL INJECTION PUMP TIMING FAILURE
When Monitored: Ignition on.
Set Condition: Engine Speed >300 RPM, Fuel command 5mm3/str, Timing command must be within a certain window
POSSIBLE CAUSES
OTHER DTC’S PRESENT
FUEL INJECTION PUMP
FUEL INJECTION PUMP GEAR NOT ALIGNED
FUEL FILTER RESTRICTED
TRANSFER PUMP INLET LINE RESTRICTED
From the above codes, I wonder if this isn't a fuel restriction problem... possibly the inlet screen in the tank is blocked.
Test the fuel pressure at all operating conditions when both cold and warm.
Has the fuel filter been replaced recently?
Regards,
John L.