P0448
Low SeverityEVAP Vent Control Circuit Shorted
EVAP System
P0448 — Instant Answer
EVAP Vent Control Circuit Shorted
Severity: LOW SEVERITY
Meaning: Short circuit in the vent valve.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $20 - $60
Most common causes:
- 1. Shorted valve (35-45% of cases)
- 2. Wiring short (10-25% of cases)
Common Causes
How to Diagnose P0448
- 1Check wiring
- 2Replace valve
OEM Procedures for P0448
P0448 affects the Charcoal Canister. Found 2 OEM service manual procedures.
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
Charcoal Canister - Replacement (ES300)
OEM Diagnostic Flowchart
Scroll to load technician if/then branches.
Read live data and freeze frame for P0448 to pinpoint the cause before buying parts.
TopScan
$51.27
DIYers who want phone-based scanning
View on TOPDON
ArtiLink600
$99
DIYers working on ABS/airbag systems
View on TOPDONGot a repair estimate for P0448? Check if the quote is fair before ordering parts.
Parts & Tools for This Job
Common parts shoppers buy for P0448 EVAP Vent Control Circuit Shorted.
Oxygen Sensor
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Catalytic Converter
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EVAP Purge Valve
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Gas Cap
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Turn This Into a Confident Next Step
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OBD2 scanner
Read codes and freeze-frame data before you guess at the fault.
Most diagnostic jobs start with a scan tool and a verified code path.
Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
Check SpecificationsRelated Resources
Repair guides, symptom pages, and wiring diagrams related to P0448.
OEM Manual Evidence
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A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti EX37 RWD V6-3.7L (VQ37VHR) Service Manual ~ LEMON Manuals LEMON Manuals: Repair Know...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 Infiniti G37 Convertible V6-3.7L (VQ37VHR) Service Manual ~ LEMON Manuals LEMON Manuals: Repa...
Related Symptoms
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Open the exact vehicle hub grounded by OEM manual evidence related to P0448.
Open the exact vehicle hub grounded by OEM manual evidence related to P0448.
Open the exact vehicle hub grounded by OEM manual evidence related to P0448.
Related Codes
Frequently Asked Questions
- What happens if the vent valve is stuck closed?
- The fuel tank cannot breathe properly, potentially causing pressure buildup or vacuum in the tank.
- Can a vent valve cause hard fueling?
- Yes — if the vent valve is stuck, the tank builds pressure, and the fuel pump nozzle clicks off repeatedly at the gas station.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29