AutoCodes – Generic – P0448

P0448 Code - Evaporative Emission Control System Vent Control Circuit Close

Quick Answer

The Evaporative Emission System (EVAP) canister vent control valve is located on the EVAP canister and is used to seal the canister vent. Common causes include Faulty canister vent control valve, Purge Control Valve harness is open or shorted, Purge Control Valve electrical circuit poor connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: P0448 indicates Evaporative Emission Control System Vent Control Circuit Close.
Common causes: Common causes include Faulty canister vent control valve, Purge Control Valve harness is open or shorted, Purge Control Valve electrical circuit poor connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 23,677

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 19, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0448 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.

OBDII Code P0448 - Evaporative Emission Control System Vent Control Circuit Close - AutoCodes.com — P0448 Code - Evaporative Emission Control System Vent Control Circuit Close

What does this mean?

What are the Possible Causes of the DTC P0448?

Faulty canister vent control valve
Purge Control Valve harness is open or shorted
Purge Control Valve electrical circuit poor connection

How to Fix the DTC P0448?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0448 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Information for Specific Makes

P0448 Hyundai — EVAP System Vent Control Circuit Shorted
P0448 Infiniti — Evaporative Emission Control System Vent Control Circuit Close
P0448 KIA — EVAP Emission System- Vent Control Valve Circuit Shorted
P0448 Mercedes-Benz — Evaporative Emission Control System Vent Control Circuit Close
P0448 Nissan — Evaporative Emission Control System Vent Control Circuit Close
P0448 Subaru — Evaporative Emission Control System Vent Control Circuit Close
P0448 Suzuki — Evaporative Emission Control System Vent Control Circuit Close

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.