What does code P2502 mean?

Q: What does code P2502 mean?

Charging System Voltage. P2502 indicates that the powertrain control module (PCM) has detected an abnormal voltage condition in the charging system, typically a mismatch between the commanded alternator output and the actual system voltage. The PCM monitors the charging circuit and sets this code when the voltage falls outside the expected range for the operating conditions, often indicating a fault in the alternator, battery, or wiring.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2502

P2502Charging System Voltage

P2502 indicates that the powertrain control module (PCM) has detected an abnormal voltage condition in the charging system, typically a mismatch between the commanded alternator output and the actual system voltage. The PCM monitors the charging circuit and sets this code when the voltage falls outside the expected range for the operating conditions, often indicating a fault in the alternator, battery, or wiring.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.