Question about 2005 Pontiac Sunfire

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GM Code 442

I recently had the check engine light come on on my 2003 Silverado and it is for Code 442 which relates to the Evap System. The mechanic indicated that the cannister vent valve needs to be replaced for $450. based on what I am reading, the valve may not not replacing?

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Do you mean code P0442? I would assume that's what you mean since you said it relates to the Evap System

This code indicates that there is a fuel vapor leak in the system. This means that a very small leak has been detected. The leak can be from a hole as small as 1mm


This code point towards any of the following:
a loose gas cap or a non factory spec gas cap
a small leak or hole in the fuel vapor hose/tube
faulty vent o-ring seal

The most common fixes is to re install the gas cap, clear the codes, and see if the code returns. Or replace the gas cap and clear the codes and see if it returns. Finally inspect the hoses/tubes for cuts/holes

This code in no way points to a canister requiring to be replaced.

Posted on Sep 29, 2009

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Well it could be the gasket on the fuel tank and it also could be the evap canister purge valve but most often it's just not pressuerizing the tank and that sets the code. Try that first.

Posted on Sep 29, 2009

  • Bruce Hathcock Sep 29, 2009

    Well it could be the gasket on the fuel tank and it also could be the evap canister purge valve but most often it's just not pressuerizing the tank and that sets the code. Try that first.

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I trouble with P0106, P0442, P0455


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No Service Engine Soon seen for code P0442


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Hi there,

Code P0442 relates to the Evaporative Emmission Control (EVAP) system and denotes a small leak.

The EVAP system prevents the escape of dangerous fuel vapours - these vapours are re-directed to what's called a Charcoal Canister (looks like a medium-sized cylinder with tiny hoses running to it).

As this relates to fuel vapours, one of the most common causes can be as simple as the petrol cap is not screwed on tight enough (or has been recently replaced with an incorrect aftermarket type). Other causes can be a hose has come off somewhere, a hose has a pin-hole or is perforated.

This type of code will usually itself after a few trips, but most people prefer to clear codes after resolving the cause.

First, check the petrol cap.
Second, you will need to trace all hoses within the Evap system and check for any signs of leakage (wear or damage etc), and remedy accordingly.

Codes can be cleared either by using a suitable Diagnostic Scan Tool, or simply disconnecting the NEGATIVE lead of your car battery for a few minutes, then reconnecting (Note: if the battery is disconnected or goes flat, run engine after power is restored, to allow the engine to relearn its settings).

If the code returns, then you should have the Evap system checked properly by an authorised dealership.

Cheers,

Scott


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