Battery Voltage Monitor – High Voltage
|Fault Code: 596
Electrical Charging System Voltage High – warning level. High battery voltage detected by the battery voltage monitor feature.
Amber warning lamp illuminated until high battery voltage condition is corrected.
Battery Voltage Monitor Circuit
The electronic control module (ECM) receives constant voltage from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. The ECM receives switched battery input through the vehicle keyswitch wire when the vehicle keyswitch is turned on.
The ECM is connected to the battery by the ECM power harness. This direct link provides a constant power supply for the ECM. The location of the battery will vary with the OEM. Refer to the OEM troubleshooting and repair manual for the battery location.
Make sure the ECM battery supply (+) is coming directly from the battery and not the starter.
Possible causes of this fault code:
- Overcharged batteries caused by a faulty alternator or regulator.