Hyundai Battery Discharging Warning

Vehicle:   Hyundai
Difficulty: ⚫⚫⚫⚪⚪
DIY Cost: $0-$300
Est. Time: 30 min -2hr

Hyundai vehicles may display a warning message alerting the driver that the battery is getting discharged.

This error often comes when you start the engine on cold mornings or when you turn off the engine but keep the ignition on. For example, you continue to listen to the radio for at least 10 minutes or more after shutting down the engine.  

hyundai battery discharge warning on radio touch screen

The "Battery Discharge Warning" display on the Audio/Nav screen when the vehicle's battery cannot maintain a specified voltage level under the existing conditions. If the engine is running, the battery is getting discharging faster than being charged. The problem can be a worn drive slip, defective alternator, bad ground connection, or excessive current demand by electronic devices. 

Hyundai Battery Discharge Warning

Error messages: 

Battery discharging due to external electrical devices on the instrument cluster
Battery Discharging Warning 

It is normal for this warning to come on if the engine is off, but the ignition is left on for over 10 minutes. Electrical consumers such as chargers plugged in the power outlet, seat heater, climate control, USB port, radio, and vehicle lights can discharge the battery at a high rate, which leads to this message to come up.

If you have most of these electronic consumers on when the engine is off,  battery discharging warning will come up much quicker. 

The battery is getting discharged is a friendly reminder telling you to start the engine. If you don't start the engine or turn off the ignition, the battery may die. It can happen even in a new car.

start engine

To get rid battery is getting discharged warning, start the engine to allow the alternator to recharge the battery. If you continue to keep the ignition on, the battery will discharge to the point that you will not start the car and may need a jump start. 

Battery Discharge Warning While Driving

If the battery discharge warning comes on when the engine is running, you have a problem that needs to be addressed.

Common problems that can lead to Hyundai battery discharging include: 

Alternator

bad alternator causes hyundai battery discharge warning

If the battery is getting discharged too fast, a warning comes on when the engine is idle or driving. In many cases, the alternator may be the problem.

If the alternator is not generating enough electricity to power the engine and electronic consumers, it may need to be replaced.

voltage regulator

The problem that causes this issue in most cases is a faulty voltage regulator. The voltage regulator is mounted on the back of the alternator.

Even though you can replace just the voltage regulator, most auto repairs shops recommend replacing the complete alternator as a unit. 

Weak Battery

Weak Hyundai Elantra Battery

A weak battery is another common problem that can cause the Hyundai battery warning light to come on. 

If the battery is not holding a charge or can no longer charge fast enough, you could end up with the battery is getting discharged on the dashboard or touch screen. 

You can easily check if the battery is good with a car battery tester. A battery tester runs load tests on the battery to make sure the battery can hold a charge. Follow this guide to learn how to test your car battery yourself.

GPS System 

Hyundai gps drains battery

The GPS module may get stuck in a Satelite searching mode, leading to the battery discharging at a high rate. One possible solution is to reset the GPS module by removing the GPS fuse for a couple of minutes. 

On a Hyundai Elantra, you can reset the GPS by pressing the reset button for the GPS. Look for a reset button under the volume knob and hold it down 30 seconds. The GPS will reboot and should operate normally. 

Serpentine Belt

worn belt

A worn serpentine belt or weak belt tensioner can be why a Hyundai shows battery is getting discharged when driving. 

Ground Connection

ground connection

Another possible issue could be a poor ground connection. Check both battery terminals and also ensure there is a good ground connection between the engine and frame. 

Troubleshooting 

  1. First, you should test the battery to make sure the battery is charging properly and holding a charge. 
  2. Next, carry out a charging system test. Turn on the air conditioner and all lights. Your multimeter should register from 13.5 to 14.3 Volts. If it's not reaching that level, then your alternator may need to be replaced. If it's reaching that level, but the battery keeps on discharging, your battery may not be holding a charge.
  3. Check for a parasitic current draw. 
  4. Run a complete system scan using a Hyundai scanner

 

By YOUCANIC Automotive Experts
Nov 2020