2016 Sierra 5.3. Got the p0442 code today

[FADEC]

Got the po442 code last week, reset it and it came back today (no surprise) Evaporative Emission Control System Leak Detected (Small Leak)” First "real" issue that this truck has had. Will need to take it in for repair. It might still be covered by the emissions warranty if this is still included in it. 53k miles on truck.

 

[Passport1]

Try a new gas cap.

 

[JeffKeryk]

^^^^ Exactly.

 

[zfasts03]

My `16 Suburban is capless, don't know if the same for pickups.

 

[wpod]

My `16 Suburban is capless, don't know if the same for pickups.

If the leak is from the capless filler inspect and may be clean the sealing surfaces

 

[FADEC]

Try a new gas cap.

Thanks for the advice. Will order one. For hopefully $15 its a cheap fix.