Battery Saver Active Causes and Fixes (Chevrolet and GM)

By | October 21, 2021

Battery Saver Active Causes and Fixes
If you have Chevrolet or GM vehicle a see a battery saver active message come on the dashboard, there may be an issue with the charging system.

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?
Battery Saver Active
Battery Saver Active is a smart system developed by GM/Chevy to get the most driving time from the battery when the charging system is failing.

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?
How to Diagnose Battery Saver Active
The charging system needs to be tested to see if it is working.

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)

Fix #1 Battery Current Sensor
Battery Saver Active Causes and Fixes Sensor
The battery current sensor informs the onboard computer (ECM), that there is more current flowing out of the battery than in.

When more amps are flowing out, the ECM sees a charging issue and goes into battery saver active.

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 a problem with the sensor.

If the voltage is lower than 13-volts, there is likely a problem with the charging system.

Example Battery Current Sensor on Amazon
GM Genuine Parts 13505369 Battery Current Sensor

Fix #2 Alternator
If the alternator goes bad and stops charging, it can 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 alternator.

Once removed, an alternator can be tested at many auto parts stores.

Be sure to call around first to see which store one can test it for you.

Fix #3 Battery Cable Terminals
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.

Fix #4 Battery
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.



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