What causes a Sierra to throw a p0442 code?
Gas Cap Bad – A bad fuel cap can cause the P0442 code to be thrown for sure. The Sierra will typically be warning you to tighten the fuel cap. This is a great place to start.
What to do about gas leak in GMC p0442?
Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine. You likely won’t notice any drivability problems. With a P0442 GM, 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.
What does the code p0442 stand for?
P0442 is a OBDII trouble code. The code technically stands for: Evaporative Emission System Leak Detected. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engine’s intake in order to be ignited in the normal combustion process.
Is there an EVAP code for p0442 medium leak?
The P0442 medium leak is a bit trickier to diagnose. Also, many manufacturers have technical service bulletins regarding EVAP codes. Be sure to check if your vehicle has any technical service bulletins available to save time diagnosing and/ or misdiagnosing the car.
What causes the trouble code p0442 on a Chevy Silverado?
There are many things that can cause the P0442 trouble code on the Chevrolet Silverado. The most common problem is far and away the first one listed below. Vapor Canister Purge Valve – The most common culprit with the P0442 trouble code and the Chevy Silverado is going to be the vapor canister purge valve.
What does code p0442 small leak purge solenoid mean?
A few days ago I had my check engine light come on. Took it to O’Reilly and had the code ran. It showed P0442: evaporative emission system leak detected (small leak). I’ve been told having a smoke test done is the easiest way to find the leak but the local shop said it’ll cost $42.50 for an hour of time (I’m cheap and would rather find it myself).
Where is DTC code po442 on Silverado Sierra?
Two or Three years back I received this same code and a friend at the dealer ship mentioned to me about a common problem related to this which was fixed by changing out the “Vent Valve” located on the back end of the fuel tank. Once I changed the part, the code went away, until a month or so back.
How much does it cost to repair a GMC p0442 code?
The cost of diagnosing the P0442 GMC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.