P0448 - Evaporative Emission Control System Vent Control Circuit Shorted

The EVAP vent control circuit is shorted.

Code Overview

The EVAP vent control circuit is shorted.

Common Causes

• Short to power or ground in the EVAP vent control circuit
• Failed vent valve or solenoid coil
• Damaged harness or connector near the vent valve
• Moisture or corrosion affecting the vent-circuit wiring

Symptoms

• Check-engine light with no major drivability complaint
• Fuel tank may be hard to fill in some cases
• Failed emissions readiness or inspection

Diagnostic Steps

1. Inspect the vent-valve harness for rubbed-through or shorted wiring
2. Verify power, ground, and control signal behavior at the vent valve
3. Check vent-valve coil resistance if service information supports it
4. Confirm the short before replacing the valve or control module

Repair Difficulty

Moderate

General difficulty estimate for the most common repair path.

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

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Next Steps

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