Evaporative Emission Control System Vent Control Circuit Close
Table of contents
- Possible Causes
- How To Fix
- Tech Notes
- Cost To Diagnose
- When is the code detected
- Possible Symptoms
- Description
P0448 NISSAN Possible Causes
- Faulty canister vent control valve
- Purge Control Valve harness is open or shorted
- Purge Control Valve electrical circuit poor connection
How do I fix code P0448 NISSAN?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Tech Notes
- A very common problem with Nissan vehicles. Before replacing any parts, check for damage EVAP canister and for loose hoses from the vent control valve to the canister.
- There is a factory Nissan service bulletin to help diagnose the P0448 code:
- Nissan Factory Service Bulletin OBDII Code P0448
- There are factory service bulletins for the following Nissan models:
- 2005-2007 Nissan Pathfinder
- 2005-2007 Nissan Pathfinder Service Bulletin OBDII Code P0448
- 2007-2009 Nissan Altima Sedan
- 2008-2009 Nissan Altima Coupe
- 2007-2009 Nissan Altima Hybrid
- 2009 Nissan Maxima
- Nissan Factory Service Bulletin OBDII Code P0448
- 2006-2015 Nissan Titan
- 2006-2015 Nissan Titan Factory Service Bulletin OBDII Code P0448
Cost of diagnosing the P0448 NISSAN code
The cost of diagnosing the P0448 NISSAN 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.
When is the code detected
EVAP canister vent control valve remains closed under specified driving conditions.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P0448 NISSAN Description
The Evaporative Emission System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent. This solenoid (the EVAP canister vent control valve) responds to signals from the Engine Control Module (ECM). When the ECM sends an ON signal, the coil in the solenoid valve is energized.
A plunger will then move to seal the canister vent. The ability to seal the vent is necessary for the on board diagnosis of other evaporative emission control system componentsThis solenoid valve is used only for diagnosis, and usually remains opened. When the vent is closed, under normal purge conditions, the evaporative emission control system is depressurized and allows EVAP Control System (Small Leak) diagnosis.