Question about 2002 Chevrolet TrailBlazer
This is an emmissions code that says there is a leak in your evaporative system.I would start by changeing the gas cap.
Posted on Mar 04, 2009
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Posted on Jan 02, 2017
SOURCE: check engine light code PO442
You likely won't notice any drivability problems. P0442 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.
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.
Good luck and hope this helps
Posted on May 07, 2009
The code PO442 is a small leak somewhere in the evaporative emissions control system, the best way to find that is to take to a shop that does smoke tests for emissions.
As far as the nozzle, try changing the position of it the next time you get gas.
Posted on Nov 18, 2009
Most of the time they mean:
p0441 = Evaporative Emission System Incorrect Purge Flow
p0422 = Evaporative Emission Control System Leak Detected (small leak)
MOre info at http://www.obd-codes.com/p0442
Posted on Jan 10, 2010
P0401 sets when EGR flow test runs and fails. EGR may be moving too slow or not at all. May be a bad connection.
P0442 sets when vacuum decay test indicates small leak in the EVAP system detected during diagnostic test. Check for a loose or defective gas-cap. If the cap is fine it may be a false code or could be related to another EVAP component.
Posted on Apr 27, 2010
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