Code po442 Evaporative emission control system leak detected.(small leak) How do I find the leak. Thank You, Jay B

Location

https://www.google.com/search?q=2006+gmc+canyon+canister+purge+valve+location

The Codes

P0455 GMC Code - Evaporative Emission Control System ...

https://www.engine-codes.com > p0455_gmc
P0455 GMC Code - Evaporative Emission Control System Leak Detected Gross Leak · Possible Causes · How To Fix · Tech Notes ? · Cost to Diagnose · Meaning.

P0442 GMC Code Evaporative Emission Control System Leak ...

https://www.autocodes.com > p0442_gmc
Aug 17, 2017 - The P0442 code means that the control module has detected a small leak in the Evaporative Emission (EVAP). Loose fuel tank filler cap is the ...

no nothing to do with transmission ---its an evap code small leak detected this is the usual check gas cap that its on and tight or replace because seal is shot but the following link explains the other problems with assistance in helping repair problem
http://www.obd-codes.com/p0442

code p0442 refers to evaporative emission (EVAP) system--small leak detected====causes hose connection/s---intake leak--EVAP canister---EVAP canister purge valve
it also refers to evaporative emission system --large leak detected (fuel cap loose/ off)===causes---mechanical fault--hose connection/s--EVAP pressure sensor.

CODE PO442 - EVAPORATIVE EMISSION CONTROL SYSTEM LEAK DETECTED SMALL LEAK. LIST THINGS TO CHECK, CHECK FUEL FILLER CAP,CHECK FUEL FILLER PIPE PACKING,CHECK THE DRAIN VALVE,CHECK THE PURGE CONTROL SOLENOID VALVE,CHECK THE PRESSURE CONTROL SOLENOID VALVE,CHECK THE EVAPORATIVE EMISSION CONTROL SYSTEM LINE,CHECK CANISTER,CHECK FUEL TANK,CHECK ALL HOSES FOR DEFECTS LIKE CRACKS, BROKE PLACE OR DISCONNECTED. TO EVAPORATIVE EMISSION CONTROL SYSTEM.

P0305....Cylinder 5 Misfire Detected

P0442....Evaporative Emission Control System Leak Detected (small leak)

P0455....Evaporative Emission Control System Leak Detected (gross leak)

P0446 Evaporative Emission System Vent Control Circuit.
The following are descriptions of all Evaporative possible codes:

P0441 Evaporative Emission System Incorrect Purge Flow
P0442 Evaporative Emission System Leak Detected (small leak)
P0443 Evaporative Emission System Purge Control Valve Circuit
P0444 Evaporative Emission System Purge Control Valve Circuit Open
P0445 Evaporative Emission System Purge Control Valve Circuit Shorted
P0446 Evaporative Emission System Vent Control Circuit
P0447 Evaporative Emission System Vent Control Circuit Open
P0448 Evaporative Emission System Vent Control Circuit Shorted
P0449 Evaporative Emission System Vent Valve/Solenoid Circuit
P0450 Evaporative Emission System Pressure Sensor/Switch
P0451 Evaporative Emission System Pressure Sensor/Switch Range/Performance
P0452 Evaporative Emission System Pressure Sensor/Switch Low
P0453 Evaporative Emission System Pressure Sensor/Switch High
P0454 Evaporative Emission System Pressure Sensor/Switch Intermittent
P0455 Evaporative Emission System Leak Detected (large leak)
P0456 Evaporative Emission System Leak Detected (very small leak)
P0457 Evaporative Emission System Leak Detected (fuel cap loose/off)
P0458 Evaporative Emission System Purge Control Valve Circuit Low
P0459 Evaporative Emission System Purge Control Valve Circuit High
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At least the cap isn't loose for the gas tank.

I would clear the code with an OBD-II Scanner 'erase code' button, and see how long it takes for it to come back.

PO442 is the data trouble code for (evaporative emission control system leak detected "small leak") it means that the OBD-II system has detected a small vacuum leak in the evaporative control system.

You will need to find the vacuum leak in the evaporative control system, check for cracked or broken vacuum lines and hoses, especially the vacuum hoses and lines around the evaporative (Evap) canister and the (Evap) solenoid. Also check the gas cap seal for damage.

Vacuum hoses and lines should be checked very well for any cracks or breaks, because they usually hide under the vacuum line or hose.

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

P0442 Evaporative Emission Control System Small Leak Detected
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction

You should replace the VAPOR CANISTER PURGE REGULATOR.

THESE ARE FROM THE GM CODE DEFINITION MANUAL

P0135 - Heated Oxygen Sensor (HO2S) Heater Performance Bank 1 Sensor 1
P0449 - Evaporative Emission (EVAP) Vent Solenoid Control Circuit
P0442 - Evaporative Emission (EVAP) System Small Leak Detected