Question about 2000 Chevrolet Silverado 1500

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I am getting codes PO440 PO443 PO 449 on my 2000 Silverado and the SES light is on

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PO440 Possible Causes:
Charcoal canister is loaded with fuel or moisture
Fuel filler cap is loose, cross-threaded, damaged or wrong part
Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
Fuel tank pressure sensor is damaged, disconnected or it failed
Fuel tank vapor line(s) is clogged, damaged or disconnected
Purge valve vapor line is clogged, damaged, or disconnected
Purge or vent solenoid power circuit is open (check the fuse)
PCM has failed

PO443:
Purge solenoid control circuit is open or shorted to ground
Purge solenoid control circuit is shorted to system power (B+)
Purge solenoid power circuit is open (test the ENG1 fuse)
Purge solenoid is damaged or has failed
PCM has failed

PO449:
Sames as PO443.

Hope this helps.

Posted on Mar 06, 2009

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2 Answers

How to fix po440 trouble code


http://www.obd-codes.com/p0440

do the easiest cause first... did you recently get gasoline and didn't put the fuel cap back on correctly?

CLEAR the trouble code and re-seat the gas cap properly & then see if the check engine lights up with the same code... then go from there

i've embedded gbob59s link because it should have worked the first time

Apr 10, 2015 | 1997 Volkswagen Cabrio

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Check engine light came on


. code po305 is cylinder 5 misfire that can a bad spark plug or a injector.po153 is a o2 sensor. there is 3 on your engine. which one did they replace. the code po153 is for the front one it is in front of the radiator. code po443 is for the purge solenoid ,but there is many things the can cause the code the garage should have checked things first. wow

Dec 12, 2012 | 2000 Ford Taurus

1 Answer

Trouble codes po443 and po449


PO 443--Evap Purge Control Valve Circuit

PO 449---Same thing---Vent Valve/Solenoid
Circuit Malfunction

Dec 04, 2012 | 2001 Pontiac Grand Am SE

1 Answer

Trouble codes PO440 and PO452


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

Oct 07, 2012 | Chevrolet Avalanche Cars & Trucks

1 Answer

How to fix this codes po443,po730,po751,po756,pib11,c1243


po 443= purge solenoid circuit
po 730= incorrect gear ratio, transmission problem
po 751= 1/2 solenoid problem
po 756= 2/3 solenoid problem
other 2 have no listing on alldata
you should seek professional help with these trans codes.
check ALL fuses first

May 28, 2011 | 1999 Oldsmobile Silhouette

1 Answer

99 Silverado code PO 300 what causes it? What parts needed to fix


p0300 is a random misfire. A scanner will need to tell the primary cyls that have problems. A (qualified) repair shop will need to check it. Could be from vac leaks, to fuel pressure, to spark problems????/

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3 Answers

Po443 code


po 443 bad evap purge vavle.

Oct 27, 2009 | 2000 Cadillac DeVille

1 Answer

I have a 2001 nissan sentra xe and my check engine light is on i had a diagnostic test and the codes PO 455 and PO 0440 came back what does this mean?


PO 455- Evaporative emission control System leak detected (check exhaust system, egr valve, or entire intake and exhaust system)


PO440- Evaporative Emission System Malfunction (also check oxygen sensor)

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1 Answer

Diaganosed the car with P0741 and P0440 trouble codes


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.

Nov 20, 2008 | 1999 Cadillac DeVille

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