Trouble with trouble codes
 

Hi All,

I have an 03 Outlander. Been having a hard time trying to fix an Evap problem. Yeah, I know, what else is new? CEL is on, of course. Tank was out, small hole in top. Fixed that and it passed the smoke test. It's now throwing a code of P0456. Unfortunately the codes only go up to P0455 as shown below:

P0440 Evaporative Emission Control System Malfunction
P0441 Evaporative Emission Control System Incorrect Purge flow
P0442 Evaporative Emission Control System leak Detected (small leak)
P0443 Evaporative Emission Control System Purge Control Valve circuit Malfunction
P0444 Evaporative Emission Control System Purge Control Valve Circuit Open
P0445 Evaporative Emission Control System Purge Control Valve Circuit Shorted
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
P0447 Evaporative Emission Control System Vent Control Circuit Open
P0448 Evaporative Emission Control System Vent Control Circuit Shorted
P0449 Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction
P0450 Evaporative Emission Control System Pressure Sensor Malfunction
P0451 Evaporative Emission Control System Pressure Sensor Range/Performance
P0452 Evaporative Emission Control System Pressure Sensor Low Input
P0453 Evaporative Emission Control System Pressure Sensor High Input
P0454 Evaporative Emission Control System Pressure Sensor Intermittent
P0455 Evaporative Emission Control System Tank Detected (gross leak)

Anyone have any ideas or experiences?
Appreciate the help,
Bill

P0456 also relates to a leak from the Fuel Cap, or EVAP system problem.

Possible Causes:

Missing or loose fuel cap
Incorrect fuel filler cap used
Fuel filler cap remains open or fails to close
Foreign matter caught in fuel filler cap
Evaporative Emission (EVAP) canister or fuel tank leaks
Evaporative Emission (EVAP) system hose leaking
Fuel tank leaking

If you have assessed all possible EVAP leaks, then I would check the security of the fuel cap, or try a new cap.