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Re: OBD II codes on Buick??


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Posted by Errin OH on June 05, 2011 at 08:01:32 from (71.79.146.170):

In Reply to: OBD II codes on Buick?? posted by 550Doug on June 05, 2011 at 04:12:40:

P0xxx are standard codes shares between all vehicles made for US after 1996. P1xxx are model specific codes.

Note - Vehicles made outside the US, not for import to the US did not go to this standard until 2000-2001. Plus some diesel models do not follow the standard codes.

I found this to be one of the better links to get info from. Scroll down to see standard codes. Click on a manufacture to see specific codes.

Codes P0442 - http://www.obd-codes.com/p0442

Technical Description - Evaporative Emission Control System Leak Detected (small leak)

What does that mean?
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.

Symptoms
You likely won't notice any drivability problems.

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



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