Smart fortwo electric drive maintenance: the schedule, the costs, the traps

60,000-150,000 mi · $3,000-$8,000+

2019 recall covered cell-internal welds on the main cell conductors coming loose under heat/vibration. The 17.6 kWh pack is passively (air) cooled, so hot climates and long idle periods accelerate range loss; replacement parts availability is limited since Smart left the US in 2019.

Any mileage · $150-$3,000

The ED has no alternator and back-feeds the 12V from the HV pack. A dead/weak 12V can let the HV cells drain to zero, throw a near-irreversible error, and destroy the BMS and current sensor. The 12V itself is cheap (~$150-$300) but the cascade damage is not. Keep it charged.

70,000-150,000 mi · $800-$2,500

The sensitive BMS can lock the car out (no-start) to protect the pack; failures often tie back to a prior 12V drain event.

60,000-130,000 mi · $1,000-$2,500

Failure of the 7.2 kW onboard charger prevents AC charging; diagnosis and part sourcing is harder post-US-exit.

Any mileage · $2,500-$6,000

Rear-mounted 80 hp motor and single-speed reduction gear are generally durable; failures are uncommon but expensive and parts-limited.

40,000-90,000 mi · $200-$600

Regenerative braking means friction pads last far longer than gas models, but the lightly-used rotors and slides rust/seize, so cleaning or rotor replacement becomes the actual brake job.