Urgency:Service soon
Is it safe to keep driving?
Briefly. You have as long as the battery lasts — often 20 to 60 minutes — before the engine stops. Drive straight to a repair shop or home; do not start a long trip.
Likely causes
- Failed alternator
- Broken or slipping serpentine belt
- Corroded or loose battery terminals
- Failed voltage regulator
Typical repair cost (US)
$20 – $900
Cleaning terminals or a belt at the low end; an alternator replacement at the high end.
A typical range, not a quote. Actual cost depends on the car, the shop and the fault.
What to do now
- Switch off everything electrical you can: A/C, radio, heated seats, unnecessary lights.
- Do not switch the engine off until you reach a safe place — it may not restart.
- Have the charging system tested; most US parts stores test alternators and batteries free.