How to fix po440 trouble code

Evaporative emission control system malfunction

Trouble Code: P0128

Thermostat Rationality Test

Possible Causes:


Check the operation of the thermostat (it may be stuck open).ECT Sensor is contaminated, damaged or it has failed.Inspect for low coolant level or for an incorrect coolant mixture.Trouble Code: P0440

EVAP Purge System Fault

Possible Causes:


EVAP purge valve vacuum supply is leaking or clogged.EVAP purge valve is stuck closed.EVAP purge solenoid has failed.NVLD assembly (leak detection) is damaged or has failed.NVLD switch circuit is open or the NVLD switch has failed.Ground circuit is open.PCM has failed.Trouble Code: P0456

EVAP Small Leak (0.020") Detected

Possible Causes:


.EVAP fuel tank or canister vapor hoses leaking or damaged.EVAP system component leaking, fuel cap loose or missing.Leak detection pump damaged or leaking.Trouble Code: P0622

Generator Field Control Circuit Malfunction

Possible Causes:


Generator field control circuit is open or is shorted to ground.Generator field control circuit is shorted to system power (B+).Generator field ground circuit is open.Generator is damaged or PCM has failed.PCM has failed.Here are the codes and causes.

PO440-EVAP SYSTEM NO FLOW DURING PURGE.CODE PO PO452 - FUEL TANK PRESSURE SENSOR CIRCUIT LOW INPUT.

The P0440 means "Evaporative Emission Control System"

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That is P0440
Difintion is: Leak in the Evpaorative fuel emission system. Possible common cause loose or defective gas cap.

p0440 is an evaporitive emission system system large leak detected generally on an 02 gm vehicle it is very common that the vent solenoid located by the fuel tank if you replace it the light will take a few days to clear its self. the vehicle runs tests on all sensors and systems and the test has to pass or fail a number of times before the pcm will turn on or turn off a check engine light.

this codes make refer to evaporative emission control system purge , and have problem in curcuit

First check for leak on a evaporator system hoses.If there is no any leaks-change evaporative canister purge valve

EVAP is for Evaporative emissions control system, so no this is not EGR, that is Exhaust Gas Recirculation system, as far as the P1665 goes it is related to the other trouble code P0440, u will need to replace the EVAP system Purge flow control solenoid. This should correct both problems after u replace the part disconnect the battery for 5 min's to reset system.

The P0741 code is a torque converter clutch stuck in the off position and the po 440 code is an evaportative emission control circuit malfunction. The po440 code could be the gas cap not seated properly. Niether has anything to do with the radiator.