Smart ForTwo 453-FL Coupé
Weaknesses, engine ratings and buying advice
Engine Ratings
Vehicle Weaknesses
| Weakness | Cost | |
|---|---|---|
| DC-DC Converter Defective — Charging Abort A faulty DC-DC converter prevents the 12V battery from charging; without sufficient 12V voltage, the HV contactors cannot close. Vehicle no longer moves under its own power. Symptoms: Fault message 'charging not possible – visit workshop', vehicle stationary, 12V voltage measurable below 13 V from 70,000 km | High | |
| 12V Battery Drains Quickly The 12V lead-acid battery is not designed for the charge/discharge conditions of a BEV and sulphates. After 3–4 years a complete failure that renders the vehicle undriveable is typical. Symptoms: App shows 12V warning, vehicle cannot be started, charging aborts with red battery symbol from 40,000 km | Low | |
| Sporadic Charging Aborts at Wallboxes Charging aborts without warning, especially with managed charging current or mains disturbances. Statistically occurs approximately every 30,000 km and usually resolves itself after a 15-minute wait. Symptoms: Charge cable LED flashes red, error message 'charging not possible', clears after unplugging/replugging and a 15-minute pause from 30,000 km | Low | |
| Smart Control App — Connection Errors and Pre-Conditioning The official app regularly loses the vehicle connection. The immediate boost for pre-conditioning functions reliably in only about 50% of cases after overnight parking. Symptoms: App shows vehicle as offline, pre-conditioning does not start, daily re-login required | Low |
Frequently Asked Questions
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Last updated: February 2026 · All information without guarantee