2017 Outlander Battery Light On & Slow Cranking - What's going on?

ClearTheCode admin answer:

It sounds like you're experiencing a classic charging system issue. While the battery might test "okay" under no load, it could be struggling to hold a charge or the alternator isn't properly recharging it.

Here's what to check and do:

1. Check Battery Terminals: Ensure both positive and negative battery terminals are clean, tight, and free of corrosion. Loose or corroded connections are a common cause of poor starting and charging issues.
2. Test Alternator Output: A professional test is best. Many auto parts stores can perform a free charging system test that checks the alternator's output voltage and current. A healthy alternator should put out around 13.5-14.5 volts when the engine is running.
3. Look for OBD Codes: Even if the check engine light isn't on, a scanner might reveal codes related to the charging system. Common codes include:
   • P0562: System Voltage Low
   • P0622: Generator Field Control Circuit Malfunction
4. Inspect Serpentine Belt: Make sure the serpentine belt, which drives the alternator, is not worn, cracked, or loose. A slipping belt can prevent the alternator from charging effectively.
5. Parasitic Draw Test: If the battery keeps draining even after being charged, you might have a parasitic draw. This is when an electrical component continues to use power when the car is off. This test is more complex and usually requires a multimeter.

When to See a Shop: If the alternator tests bad, or if you're uncomfortable performing these checks, it's best to take your Outlander to a qualified mechanic. Ignoring a failing charging system can lead to being stranded and potentially damage other electrical components. A professional can accurately diagnose the root cause and replace the faulty component, whether it's the battery, alternator, or a wiring issue.