1ige1he¶

1 excerpts.

Source: r/MechanicAdvice (score 8, 8 comments)¶

reddit.com/r/MechanicAdvice/comments/1ige1he · p. 1 · Applies to: 450

Reddit thread: Smart car (450) dash randomly lights up like a Christmas tree and loses power. Then won’t restart or go into gear. But after 1 min it clears up and works ok Source: r/MechanicAdvice (score 8, 8 comments) Topic: electrical - battery/alternator/dashboard warning lights Models discussed: 450 Solution status: unclear

Problem: Smart car (450) dash randomly lights up like a Christmas tree and loses power, then won't restart or go into gear. After 1 minute it clears up and works ok.

Solution: Multiple diagnostic suggestions: Check battery terminals for cleanliness and tightness; Check voltage with multimeter (car off should show 12V, car running should show 13-14V); Consider ECU solder joint cracks common on these models; Possible dying old battery or failing alternator. OBD reader shows 14v steady.

Key facts: - Intermittent dashboard warning lights followed by power loss and inability to shift gears - Symptoms resolve spontaneously after approximately 1 minute - OBD reader voltage reading shows steady 14V - Top suggested causes: battery terminals, dying battery, failing alternator, or cracked ECU solder joints (known issue on 450 models)