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Po440 And Po449 Codes

llihkao

By llihkao
in Ask A GM Technician

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llihkao New Member

llihkao

Posted
Posted

I have a 1999 GMC Sierra 4WD extended cab pickup with a 5.3L Vortec engine. The "service engine soon" light comes on and when I read the computer, codes PO440 and PO449 appear. The "ses" light stays off for a short time after I erase the codes, then it reappears. Someone please tell me what I need to do or replace in order to eliminate this problem. Also, my truck experiences terrible hesitation whenever I first drive it after it has set for a few hours. It acts like it is not getting enough fuel. This problems goes away after about 60 seconds of running the engine. Are these problems related? Thanks.

ruddy Enthusiast

ruddy

Posted
Posted
I have a 1999 GMC Sierra 4WD extended cab pickup with a 5.3L Vortec engine. The "service engine soon" light comes on and when I read the computer, codes PO440 and PO449 appear. The "ses" light stays off for a short time after I erase the codes, then it reappears. Someone please tell me what I need to do or replace in order to eliminate this problem. Also, my truck experiences terrible hesitation whenever I first drive it after it has set for a few hours. It acts like it is not getting enough fuel. This problems goes away after about 60 seconds of running the engine. Are these problems related? Thanks.

 

Try this site: http://www.obd-codes.com/trouble_codes/

LowRyter Enthusiast

LowRyter

Posted
Posted

I have a 1999 Chev 2500, 6.0L, I got a service engine light. Code reader listed 440:

 

Evaporative Emission System (EVAP) small leak/no flow condition

Probable Causes:

a) Defective or loose fuel cap

b) EVAP Canister or hose cracked- not connected

c) Purge or vent solenoid defective

d) Vacuum leak at engine.

 

Let me know if you get a fix. I could use it.

Indy Enthusiast

Indy

Posted
Posted

TSB: 04-06-04-055a should cover it. Probably need vent solenoid 103821050 and bracket 15105605. It's a common problem with dirt in the Evap valve on top of the gas tank. I've had code PO449 and PO452 for about 5 years now, never got around to fixing it yet. It does not cause any driveability problems at all. If your truck is running poorly, it's not related to code PO449.

The code resets on the second drive cycle. If you read the code after the first drive cycle you will get PO449 code pending.

Krambo Enthusiast

Krambo

Posted
Posted
TSB: 04-06-04-055a should cover it. Probably need vent solenoid 103821050 and bracket 15105605. It's a common problem with dirt in the Evap valve on top of the gas tank. I've had code PO449 and PO452 for about 5 years now, never got around to fixing it yet. It does not cause any driveability problems at all. If your truck is running poorly, it's not related to code PO449.

The code resets on the second drive cycle. If you read the code after the first drive cycle you will get PO449 code pending.

 

:smash: Agree. Your engine stumbling is not related.

  • 3 months later...
BIG BEE New Member

BIG BEE

Posted
Posted

My 99 is doing the same things, I changed the fuel pressure regulator and the stumbling has gone away. I still need to replace the vent solenoid

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