Question about 2004 Chevrolet TrailBlazer

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The code is p0442 what dose that mean and what part do i need

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This is a small leak in the evaporative emission control system.Most common cause is a loose or faulty gas cap but not always, Sometimes the check valve in the gas cap doesn't seat properly allowing the gas tank pressure to bleed down. The EVAP system needs to see a positive pressure in the tank.

Posted on Jun 05, 2010

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P0442 is an Evaporative Emission Control System Leak (a small leak) ("EVAP")

This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.

CAUSES:

A code P0442 most likely means one or more of the following has happened:

  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal.
POSSIBLE SOLUTIONS

With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses.

Posted on Jun 05, 2010

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Typical gas cap left off, left loose, or defective...buy one if gone or defective or tighten it if loose, then like the man said clear the code with a scanner the proper way and drive it see if the code retiurns if not you are done, if it returns follow the steps that the previuos men told you to follow as that is the same correct advise I would have given you as well.
Mopst likely it is a purge valve, but cant rule out the rest...however the purge is a real easy test done in your hand.... pull the vac. hoses off it and shake it...if gas comes out of it the purge is defective and needs a new "Dealership" purge valve part, clear code and retest drive for a few days...no codes ....no problems!!
Happy Motoring!!

Posted on Jun 15, 2010

  • Gevans17 Nov 20, 2010

    GM has extended the normal warranty to 10 years /120,000 miles for 2002 Trailblazers operated in the northeastern states (salt belt) due to leaks developing on the fuel sending unit on top of the fuel tank, triggering p0442 code. This is NOT a recall ,but an extension of the normal warranty. Affected gas tanks may have fuel leaks from the top of the tank when engine is running. If you have already paid for this repair conact GM with your receipt for reimbursement.

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The emission pump up motor could be bad as well If you do as Emmsion wiz suggests if the pump does not pressurize the system you may want to check fuse for the emission pressurization pump, it comes on when you start the car and detects low pressure in the fuel tank or evaporative system, but only would need to be checked after you have tried the cap first.

Posted on Jun 05, 2010

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With a P0442, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, or
Inspect the EVAP system for cuts/holes in tubes/hoses
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P0442 is the code that I need to know what it means/2003 chevy blazer


A code P0442 most likely means one or more of the following has happened:


  • A loose or improperly affixed gas cap
  • A non-conforming gas cap (i.e. not factory/original brand)
  • A small leak/hole in a fuel vapor hose/tube
  • Other small leak in EVAP system
  • Faulty vent o-ring seal
With a P0442, the most common repair is to:
  • Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
  • Otherwise, replace the gas cap, or
  • Inspect the EVAP system for cuts/holes in tubes/hoses

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P0442 means that there is a small leak in what is called the evap system What it dose is take gas fumes from the fuel tank and divert them to the charcoal canaster to be burned in the combustition system routed through two solinoid valves called the canaster vent valve and the canaster purge valve the vent being from the tankto the canaster and the purge being canaster to the combustion chamber Its a small leak it could be anyware in the system but i would replace the gas cap first many times it starts to leak at the seal and will set this code Its all for emissions and dosn;t have a large effict on over all proformance unless you need to pass emissions

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1 Answer

I need to know what does this code p0442 means?


P0442 Means you have a leak in your EVAP system.
The EVAP system prevents gas vapors from entering the air .
This code can be set by a leak in the lines or a clogged charcoal canister.
Most common reason is If you did not put your gas cap on all the way.
Hope this helps
Leave feedback please
thank you FixYa

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