Grand Prix P0446 Trouble Code Causes P0446 can be caused by something as simple as a gas cap. However, P0446 may also cause a gas smell. ![]() The only other symptoms of P0446 in the Pontiac Grand Prix are a slight decrease in fuel economy. Typically, the only symptom of P0446 will be the check engine light. Pontiac Grand Prix P0446 OBDII Code Symptoms The P0446 trouble code will appear when the vent control valve is not responding to prompts to open and close from the PCM (Powertrain Control Module). It is usually closed during regular operation, which helps prevent any fuel vapors from escaping into the atmosphere. When the EVAP vent control valve regulates and helps maintain pressure in the Pontiac Grand Prix’s fuel tank. The EVAP system captures all fuel vapor from the fuel tank and sends them to the engine’s intake manifold to be ignited in the normal combustion process. The definition encompasses three components: first, the extensive system impacted by the code second, the specific segment and third, the nature of the error. It often appears with other error codes, such as P0420, P0441, or P0440. ![]() In layman’s terms, P0446 indicates a problem with the EVAP system vent control valve. P0446: Evaporative Emission Control System → Vent Control Circuit → Malfunction ![]() P0446 is a standard OBDII trouble code, applicable to any make or model of vehicle, whether it’s a Grand Prix or not. P0446: EVAP System – Vent Control Circuit – Malfunction This code corresponds to a specific number obtained when connecting your Grand Prix to an OBDII scanner.Ī faulty vent control valve most commonly causes P0446. A prevalent issue with the Pontiac Grand Prix is the P0446 code.
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