Is overcharging dangerous?

Yes — voltage above 15V can damage the battery, ECM, and other electronics. Fix immediately.

Can I just replace the voltage regulator?

On some older vehicles yes. On most modern cars, the regulator is inside the alternator and the whole unit must be replaced.

High Severity

Electrical System

Charging system voltage is too high, potentially damaging electrical components.

Common Fix

Replace alternator

Estimated Cost (DIY)

$150 - $300

Failed voltage regulator (in alternator)likely

Bad ground connectionpossible

ECM voltage sensing issueunlikely

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Is overcharging dangerous?: Yes — voltage above 15V can damage the battery, ECM, and other electronics. Fix immediately.
Can I just replace the voltage regulator?: On some older vehicles yes. On most modern cars, the regulator is inside the alternator and the whole unit must be replaced.

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