This is not always the case, but the message is there since the onboard computer no longer sees the vehicle battery being charged.
There are other possible causes than the charging system, with the most common ones listed below.
What Is Battery Saver Active?
The onboard computer (ECM) detects the voltage from the charging system, which is determined by a battery current sensor.
The smart system was created to get the most battery life and operating time when the vehicle is no longer receiving a charge.
When the sensor detects a problem, it will shut down nonessential items such as the A/C system.
How to Diagnose Battery Saver Active?
The simplest way to check this is to use a voltmeter and read the voltage while the vehicle is running.
- If the voltage is above 13.5 volts, the system is charging and working.
- If the voltage is below 13.5 volts, the charging system is likely not working.
The reason for this test is a car battery is 12-volts and will not go above this unless it is being charged.
If the car is running and the voltage is around 12-volts or lower, the charging system is not working.
Keep in mind all vehicles have a different operating voltage, with most roughly at 14-volts DC.
4 Causes and Fixes for a Battery Saver Active (Chevrolet and GM)
- Battery Current Sensor
- Battery Cable Terminals
When more amps are flowing out, the ECM sees a charging issue and goes into battery saver active mode.
If the sensor goes bad or does not have a good connection, it will give an error.
Test the vehicle while running with a meter to see what the volts are.
It is above 13.5-volts while running the charging system is usually good, and there is likely a problem with the sensor.
If the voltage is lower than 13-volts DC, there is likely a problem with the charging system.
Example Battery Current Sensor on Amazon
GM Genuine Parts 13505369 Battery Current Sensor
If the alternator goes bad and stops charging, it will cause a battery saver active message.
The alternator can be tested with a meter while running for voltage.
If the voltage is lower than 13.5-volts, there is a problem with the alternator charging.
Be sure to look at the belt that drives the alternator as it can break and not spin the unit.
Once removed, an alternator can also be tested at many auto parts stores.
Be sure to call around first to see which store one can test it for you.
Bad or loose battery terminals can cause issues even if they look good.
Take them off and examine them to be sure they are good or need to be replaced.
Often they can be cleaned with a wire brush to get a good contact on a terminal.
Usually, the problem is something else, but a bad battery can cause problems with the charging system.
A battery can be put in a charger to see if it holds a charge, or can be taken to an auto parts store which will charge and test it.
Battery Saver Active Car Wont Start
If your vehicle will not start and has battery saver active displayed on the dashboard the is an issue with the battery or charging system.
Often there will be a clicking sound which is the starter trying to get power from the battery to turn the engine on.
The first step would be to charge the battery and check the terminal connections.
Once the battery is charged and connections are good, test the alternator to be sure it is charging.
If the alternator is not charging, it will need to be troubleshot and likely replaced.
Check each of the causes and fixes above for common solutions to a “Battery Saver Active” error message.