P0442 trouble code

It means there is a leak in the e vac system

You erase the engine light by fixing the problem . With every DTC - diagnostic trouble code there are diagnostic flow chart's , steps to find the problem .

DTC P0442 : Evaporative Emission (EVAP) System Small Leak Detected

How to Diagnose P0442 Small Evap Leak 04 Chevy Avalanche

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 Defective vent valve Defective purge valve Defective leak detection pump

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Discussion of that code:
P0442 OBD II Trouble Code

another source
P0442 OBD II Trouble Code

Check purge valve that could be stuck open

Code 442 should not have any effect on how the engine runs.
The code means the engine computer has detected a small leak in the venting system for the gas tank. The most common reason is a loose or faulty gas cap.

this is an obd2 trouble code table, it can help you understand the meaning of code.

make sure your lighter fuse is not blown. sound funny but thats a common prolbem on chevys

you can look up these codes on actron.com or google that code

its an evap system small leak. most common cause is a loose gas cap. but could be any leak in the tank vent system