1p34e8s¶

1 excerpts.

Reddit thread: Cleaning up a family member's estate and have some questions¶

reddit.com/r/SmartCar/comments/1p34e8s · p. 1 · Applies to: 451

Source: r/SmartCar (score 54, 26 comments) Topic: won't start, HV battery dead after prolonged storage Models discussed: 451 Solution status: unclear

Problem: Smart 451 ED left sitting for at least a year; after replacing 12v battery in passenger footwell, car won't start and displays error messages 'do not tow away' and 'hv system workshop'.

Solution: Top comment diagnoses HV pack fully drained due to prolonged 12v battery depletion. Suggests towing the Smart car at parking lot speeds with ignition on and driver lightly braking to force regen charging for 10-15 minutes to restore HV pack above critical threshold, then attempting L1/L2 charging. Notes this is risky and has no guarantee of success. Alternative: sell to dismantler for ~$750 to preserve parts.

Key facts: - Vehicle is a Smart 451 ED (electric) - 12v battery death causes BMS failure and HV pack to drain below safe threshold - Mercedes-Benz dealer replacement battery costs $9k-$25k, not economical - Possible recovery method: tow with regen braking at low speeds for 10-15 minutes - High-risk procedure with potential for fire or accident - Parts salvage recommended over scrapping due to rarity of 451 ED components