What does code P1594 mean?

Q: What does code P1594 mean?

Charging System Voltage Too High. P1594 on Chrysler vehicles means the powertrain control module (PCM) has detected that the charging system voltage has risen above the safe limit, typically around 15.5 volts or higher. The PCM monitors the battery voltage through its internal sensing circuit and sets this code when the alternator is overcharging the battery and electrical system.

DTC codes / Chrysler codes / P1594

P1594 · ChryslerCharging System Voltage Too High

P1594 on Chrysler vehicles means the powertrain control module (PCM) has detected that the charging system voltage has risen above the safe limit, typically around 15.5 volts or higher. The PCM monitors the battery voltage through its internal sensing circuit and sets this code when the alternator is overcharging the battery and electrical system.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

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