What does code P2504 mean?

Q: What does code P2504 mean?

Charging System Voltage High. P2504 means the engine control module (ECM) has detected that the charging system voltage has risen above the safe limit for a sustained period, typically above 15.0 to 15.5 volts. The ECM monitors the voltage on its power feed and sets this code when the alternator is overcharging or the voltage regulation circuit is not controlling output correctly.

DTC codes / P25xx · Vehicle speed, idle control and auxiliary inputs / P2504

P2504Charging System Voltage High

P2504 means the engine control module (ECM) has detected that the charging system voltage has risen above the safe limit for a sustained period, typically above 15.0 to 15.5 volts. The ECM monitors the voltage on its power feed and sets this code when the alternator is overcharging or the voltage regulation circuit is not controlling output correctly.

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.