What causes the p0446 trouble code on a GMC Sierra?

When the EVAP control system vent control circuit no longer responds to the ECU, it will throw the P0446 OBDII Code. There are many things that can cause the P0446 trouble code to trigger in your GMC Sierra.

What is the trouble code on my GMC Sierra?

P0446 GMC Sierra. One of the most common trouble codes with the GMC Sierra is the P0446 code. This trouble code references a number that is given to you when you plug your Sierra into a OBDII scanner. P0446 Indicates that there is a fault in the evaporative emission control system. It often appears with other codes, such as P0420, P0441, or P0440.

How is the p0446 GMC evaporative emission vent system performance?

The Powertrain Control Module (PCM) monitors the performance of the Evaporative Emission (EVAP) system by applying a predetermined level of vacuum to the EVAPsystem then monitors the vacuum decay rate. P0446 GMC More Information Need more information on how to fix the P0446 GMC code? Get Access to Factory Service Manuals Need more help?

Can a p0446 code cause a gas smell?

P0446 code will typically not be accompanied by any noticeable symptoms. The service engine soon light will come on, but that is usually about it. You might (not very likely) notice a slight decrease in fuel economy. P0446 may also cause a slight gas smell.

What does the OBD-II error code p0446 mean?

This generic OBD-II code indicates that the evaporative vent valve in the emission control system is malfunctioning. When this occurs, the EVAP system may not be capable of pressurizing and maintaining a vacuum seal. Find out more about the most likely OBD-II scanner error code P0446 problem and related repairs. What Does the Code P0446 Mean?

Is there a P0420 code on my GMC Yukon?

P0420 is another common trouble code that accompanies P0446. P0446 code will typically not be accompanied by any noticeable symptoms. The service engine soon light will come on, but that is usually about it. You might (not very likely) notice a slight decrease in fuel economy. P0446 may also cause a slight gas smell.

Why does my GMC Silverado have a p0446 code?

Here’s a series of steps that worked for me to eliminate the P0446 code on my 2006 Silverado 2500HD 6.0. This code most often refers to a blockage in the EVAP vent system. This code is not associated with a bad gas cap or faulty EVAP Purge solenoid (on top of the intake manifold).

What to do if your Sierra has p0446?

Here are the most common Sierra P0446 fixes: Of all the items listed above, it would be wise to start with the gas cap and work your way to the fuel tank, since the gas cap is far and away the easiest and least expensive items to replace on here. Here’s a great video on how to test your gas cap.

Why does my GMC Sierra have a gas smell?

P0446 may also cause a slight gas smell. This is due to it being related to the system that deals with fuel vapors. P0446 is a universal OBDII trouble code. This means that regardless of which make or model of vehicle, the code will mean the same thing (Sierra or not).

Is it safe to drive with a code p0446?

It often appears with other codes, such as P0420, P0441, or P0440. P0446 is normally not an immediate threat to the drive-ability of your vehicle. Certainly anytime the service engine soon light is on, it’s good to deal with it as soon as possible though. It is often accompanied by P0442.

What is the Check Engine code p0445 for?

P0445 is a diagnostic trouble code (DTC) for “Evaporative Emission Control System Purge Control Valve Circuit Shorted”.

What does p0446 code mean?

P0446 is a diagnostic trouble code (DTC) for “Evaporative Emission Control System Vent Control Circuit Malfunction”.

What is OBD II code p0446?

What Does P0446 Code Mean? OBD-II Code P0446 is defined as a Evaporative System Vent Control Circuit Malfunction The evaporative control (EVAP) system captures any raw fuel evaporating from the fuel storage system (e.g. the fuel tank, filler neck, and fuel cap).

What causes the p0446 trouble code on a GMC Sierra?