P0448 means the ECU detected a short circuit on the EVAP vent control valve. The vent valve seals the charcoal canister during EVAP system self-testing. A shorted circuit usually points to a chafed wire grounding against the chassis, a failed solenoid with an internally shorted coil, or a damaged connector.
P0448 means the ECU detected a short circuit on the EVAP vent control valve. The vent valve seals the charcoal canister during EVAP system self-testing. A shorted circuit usually points to a chafed wire grounding against the chassis, a failed solenoid with an internally shorted coil, or a damaged connector.
P0448 is a evap system-related diagnostic trouble code classified as low severity. When your vehicle's ECU detects this condition, it stores P0448 and illuminates the check engine light.
If your vehicle has triggered P0448, you may notice one or more of these symptoms:
Here are the most common causes of P0448, ranked by how likely they are to be the culprit:
Generally yes, for short-term driving. P0448 is an electrical fault on the EVAP vent valve circuit and has no effect on engine performance or safety. Drive normally, but expect a failed emissions inspection until repaired.
Follow these steps to pinpoint the root cause of P0448:
Repair costs for P0448 vary depending on the root cause and your vehicle. Here are typical estimates:
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
P0448 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:
These codes are often seen alongside P0448 or indicate related issues:
Both codes refer to the EVAP vent valve circuit, but P0447 indicates an open circuit (no current flow) while P0448 indicates a short (too much current flow). The diagnostic process is similar, but P0448 is more often a chafed wire grounding against the chassis.
No. P0448 is purely an emissions and electrical fault. It does not affect fuel delivery, ignition, or any system that could cause mechanical damage. The only practical consequence is a failed emissions inspection and the check engine light.
Recent service near the fuel tank, exhaust, or rear suspension can disturb the vent valve harness. A pinched or chafed wire is a common after-service cause. Have the workshop that did the work re-inspect the harness routing free of charge if the code appeared within days.
You can clear it, but it will return within one drive cycle if the short is still present. Ignoring it long-term means a permanent check engine light, automatic emissions test failure, and the possibility of related codes piling up as the ECU loses its EVAP self-test capability.
Your car logged P0448. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €60-€600 repair range so you know the number before a shop quotes you.
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