Question about 1999 Chevrolet Blazer

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Po44o evap emission control--system malfunction....what can it be.had tested that is what cam up.guy changed a few spark plugs.next day wont start.turns over like wants to start but dnt. any indea what the prob can be?1999 chevy blazer 4x4 6 cyl

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3 Answers

I heard that in most cases with the code PO44O it is just a "Loose" Gas Cap. You need to make sure the cap is turned until you hear several clicks. Then reset code and hopefully the light stays off.

Posted on Aug 06, 2008

In the back of blazer ther is a spare tire under truck,,under and back twoard front of truck, there is a vent switch,, looks like a small black box, a small hose ,wire con,,if you take tire out,and look up in there you will see it it is like 3 by 4 inches,size of pack of smokes, maybe smaller,,tri changing it,,can only buy from dealership,,runs about 17.oo dollars..it hepled me with that code on my blazer it comes with a small piece of filter foam...good luck chad mullens@maqs.net

Posted on Aug 04, 2008

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Posted on Aug 04, 2008

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1 Answer

Code 1475 1471 1477 1472 and wont start sonetimes


This should give you some problems to look up:

P1471 EVAP Emission Control LDP Circuit Short to B+

Possible failuer of OBD II Fault code P1472

  • Signal line short
  • Sensor failure
P1472 EVAP Emission Control LDP Circuit Short to Ground
P1475 EVAP Emission Control LDP Circuit Malfunction/Signal Circuit Open
P1477 EVAP Emission Control LDP Circuit Malfunction

Apr 07, 2015 | Cars & Trucks

1 Answer

Code p1443


without knowing your make or model:

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  • Dec 07, 2013 | Cars & Trucks

    1 Answer

    Toyota echo won't start code 440 441 446


    Error Code: P0440
    Fault Location:
    Evaporative Emission (EVAP) System - Malfunction
    Possible Cause:
    Malfunction Indicator Lamp (MIL) active.
    Soution:
    Check Evaporative Emission (EVAP) System Sealing.
    Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
    Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .

    Error Code: P0441
    Fault Location:
    Evaporative Emission (EVAP) System - Incorrect Flow Detected
    Possible Solutions:
    Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
    Perform Output Test.
    Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve .
    Check Evaporative Emission (EVAP) Canister.
    Perform Basic Setting.
    Check Pipes between Tank Breathing and Throttle Body.

    Error Code: P0446
    Fault Location:
    Evaporative Emission (EVAP) System, Vent Control - Circuit Malfunction
    Possible Cause:
    Wiring harness.
    Evaporative emission (EVAP) canister purge valve.
    Engine control module (ECM).

    Feb 25, 2013 | 2002 Toyota ECHO

    1 Answer

    Code p0440 code p0441 code p0446on toy echo 2000 what is the diagnosis?


    P0440 Evaporative Emission Control System Malfunction P0441 Evaporative Emission Control System Incorrect Purge Flow P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
    • Remove and reinstall the gas cap, clear the code, and drive for a day and see if the codes come back.
    • Inspect the EVAP system for cuts/holes in tubes/hoses
    • Inspect for damaged or disconnected hoses around the Evap purge solenoid
    • Check and/or replace the sensor
    • Check and/or replace the purge valve
    • Have a professional use a smoke machine to detect leaks

    Aug 19, 2011 | 2004 Toyota ECHO

    1 Answer

    My "check engine light" and


    SYMPTOM
    The MIL is on, and DTC P1457 [leak detected in EVAP
    control system (EVAP control canister system)] is set.
    PROBABLE CAUSE
    The EVAP bypass solenoid valve can fail due to
    corrosion. Replace the bypass solenoid valve first. Clear DTC's and test drive.

    Dec 10, 2010 | 1999 Acura TL

    2 Answers

    Check Engine lite comes on Code PO440


    16824/P0440/001088 - EVAP Emission Control Sys: Malfunction Possible Symptoms
    • Malfunction Indicator Light (MIL) active
    Possible Causes
    • Evaporative Emission (EVAP) System leaking
    • Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) faulty
    • Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115) faulty
    Possible Solutions
    • Check Evaporative Emission (EVAP) System Sealing
    • Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80)
    • Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve (N115)

    Jun 17, 2010 | 2000 Volkswagen Beetle

    1 Answer

    I have a 1997 Toyota 4Runner and the Malfunction Indicator Lamp came on today. I took it to Auto Zone for a free diagnostic test and it came back as P0441...Definition: Evaporative emission control system...


    The cause of this problem is a faulty gas cap. It is not making a proper seal. Change the cap & reset light with ob11 code reader. There may possibly be a leak elsewhere but this is usually the case. Good luck!

    Feb 08, 2010 | Toyota 4Runner Cars & Trucks

    1 Answer

    I have a '96 Jetta, and i got P0440, P0302, P0172 and P1613 codes. How can I fix this? I have to go to emissions test this month, but my check endine light comes on because of these problems.


    P0440- EVAP Emission Control Sys Malfunction

    Something unspecified is wrong with the evaporative emission system. Check vac lines. Could be a loose electrical connection. This code has a very vague description.


    P0302- Cyl 2 misfire

    Has the car had a tune up in the past few years? Check plugs and wires, test for spark. Maybe a compression test. This issue may cause the next code.


    P0172- Fuel trim Bank 1 , too rich

    I would clear up the misfire first, then this code might go away.


    P1613- MIL Call-up circuit open/Short to B+

    Check the wiring under & behind the dash and instrument cluster. There apparently is a wiring issue, or the dash itself is shorted

    Jan 09, 2010 | 1996 Volkswagen Jetta

    1 Answer

    I have a 1998 BMW 323, it having a check engine light on and when i took it to the mechanic they said its code 446 " evap emission control system"


    P0446 evaporative emission control system vent control circuit malfunction, u will need to have the delaer test the system for a defective EVAP vent control solenoid

    Jun 25, 2009 | 1997 BMW 328

    2 Answers

    P0441 EVAP Control System Incorrect Purge Flow


    Error Code: P0441
    Fault Location:
    Evaporative Emission (EVAP) System - Incorrect Flow Detected
    Possible Cause:
    Malfunction Indicator Lamp (MIL) active.
    Evaporative Emission (EVAP) Canister Purge Regulator Valve faulty/jammed.
    Evaporative Emission (EVAP) Canister Purge Solenoid Valve faulty/jammed.
    Evaporative Emission (EVAP) Canister Sealing faulty.
    Pipes between Tank Breathing and Throttle Body leaky/blocked.
    Hose connection(s).
    Intake leak.
    Possible Solutions:
    Check Evaporative Emission (EVAP) Canister Purge Regulator Valve .
    Perform Output Test.
    Check Evaporative Emission (EVAP) Canister Purge Solenoid Valve.
    Check Evaporative Emission (EVAP) Canister.
    Perform Basic Setting.
    Check Pipes between Tank Breathing and Throttle Body.
    VSV connector near air filter box disconnected.

    Jun 15, 2009 | 1996 Chevrolet Monte Carlo

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