Code result
P2504
Charging System Voltage High
Moderate severity
What it means
The ECU detects a battery voltage above the regulated upper limit. The voltage regulator is not limiting alternator output, risking damage to electronic modules and battery overcharge.
Is it safe to drive?
Use caution
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical.
Most likely causes
Faulty voltage regulator
highOne of the most commonly reported causes for this code — check this first.
Poor alternator ground
mediumA plausible cause — test and verify before replacing parts.
Related help
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