P2502
Charging System Voltage
The ECU detects an out-of-range charging system voltage without specifying high or low. Indicates a generic charging fault that requires further sub-code investigation.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Alternator output faultCommon
- Voltage regulator faultPossible
Parts involved
- Alternator
- Voltage Regulator
- Battery
P2502 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.