check engine light code # p1441 what is it - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 01-24-2007, 01:22 AM
thriller thriller is offline
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Question check engine light code # p1441 what is it

I had the check engine light on a 02 TB with about 140K on it. I scanned and got the p1441 code ( EVAP system flow during non purge) I cleared the code but can anyone explain to me what that code was all about? THANKS
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  #2  
Old 01-24-2007, 04:55 AM
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If you are really lucky you can go and check your gas cap and it will be loose or you forgot it at the pump.

Other than that check your gas tank for leaks from the sending unit or the filler neck.

Good luck!
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  #3  
Old 01-24-2007, 12:50 PM
vball61 vball61 is offline
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Excerpted from the service manual:

"
DTC P1441
System Description
This DTC tests for undesired intake manifold vacuum flow to the Evaporative Emission (EVAP) system. The powertrain control module (PCM) seals the EVAP system by commanding the EVAP purge valve OFF (closed) and the EVAP vent valve ON (closed). The PCM monitors the fuel tank pressure (FTP) sensor to determine if a vacuum is being drawn on the EVAP system. If the vacuum in the EVAP system is more than a calibrated value within a calibrated time, DTC P1441 will set.

Conditions for Running the DTC Test
DTCs P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0440, P0442, P0446, P0452, or P0453 are not set.
The ignition voltage is between 10-18 volts.
The barometric pressure (BARO) is more than 75 kPa.
The fuel level is between 15-85 percent.
The engine coolant temperature (ECT) is between 4-30°C (39-86°F).
The intake air temperature (IAT) is between 4-30°C (39-86°F).
The start up ECT and IAT are within 9°C (16°F) of each other.
The vehicle speed sensor (VSS) is less than 121 km/h (75 mph).

Conditions for Setting the DTC
A continuous open purge flow condition is detected during the diagnostic test (fuel tank pressure decreases to less than -11 inches H2O).

Conditions for Clearing the MIL/DTC
The PCM will turn the MIL OFF during the first trip in which the diagnostic has been run and passed.
The history DTC will clear when the PCM turns OFF the MIL.
The DTC can be cleared by using a scan tool. "
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  #4  
Old 01-24-2007, 06:09 PM
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Menthol Menthol is offline
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Link for codes

http://www.troublecodes.net/OBD2/Pcodes.shtml
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  #5  
Old 01-27-2007, 04:00 PM
thriller thriller is offline
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THANKS GUYS!!! I cleared the code and removed and reinstalled the gas cap. I have not seen the code come up again.
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  #6  
Old 12-14-2007, 07:29 PM
hoezaycuervo hoezaycuervo is offline
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P1441 Code

I am resurrecting this thread because I am getting this code. I have check the gas cap and made a conscious effort to make sure I screw it on tight. The code will go away when I have a full tank, but once I get down to about 2/3 of a tank it cuts on. Does anyone have any suggestions on where to start to correct the system? Could it be a bad sensor? Should I have my EVAP system smoke tested? How much $ would that set me back? Any insight is appreciated!

BTW- I have 111K miles...
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  #7  
Old 12-14-2007, 07:32 PM
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rubberman rubberman is offline
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maybe try a new gas cap
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  #8  
Old 12-14-2007, 07:53 PM
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jedi_jr jedi_jr is offline
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My parents 2003 had this problem and it wasn't the Gas cap. We had to remove all evaporative hoses and put rtv on the ends to seal them and then it went away.
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