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2020 Outlander SEL: Intermittent Battery Light & Electrical Glitches

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Emily N. · rep 0 · May 22, 5:35 AM · 1 replies · solved · Question

Vehicle: 2020 Mitsubishi Outlander SEL

Hey everyone, I'm having some weird electrical issues with my 2020 Mitsubishi Outlander SEL. For the past few weeks, the battery warning light on the dash has been coming on intermittently, usually when I'm idling or at lower speeds. Sometimes it flickers, other times it stays on for a few minutes then disappears.

I've also noticed that the radio sometimes cuts out for a second, or the headlights seem to dim slightly when the light is on. The car starts fine most of the time, but I'm worried about getting stranded.

Has anyone experienced anything similar with their Outlander? What should I be looking at first?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:35 AM

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ClearTheCode admin answer: It sounds like you're dealing with a classic intermittent charging system issue in your 2020 Mitsubishi Outlander SEL. This can be frustrating, but there are several common culprits.

  1. Check Battery and Terminals First:

    • Inspect: Ensure your battery terminals are clean, tight, and free of corrosion. A loose or corroded connection can cause intermittent power issues and charging warnings.
    • Test Battery: Have your battery tested. Even if it starts the car, a weak or failing battery can put extra strain on the charging system and cause voltage fluctuations. Most auto parts stores offer free battery testing.

  2. Diagnose the Alternator:

    • Output Test: The alternator is responsible for charging the battery and powering the electrical system while the engine is running. An intermittent battery light often points to a failing alternator, specifically issues with its voltage regulator or rectifier diodes.
    • Voltage Check: With the engine running, you should see around 13.5-14.5 volts across the battery terminals. If it's consistently lower or fluctuates wildly, the alternator is suspect.

  3. Inspect Wiring and Ground Points:

    • Visual Check: Look for any frayed, damaged, or loose wiring connected to the alternator, battery, and main engine ground points. A poor ground connection can mimic many electrical problems.

  4. Scan for Diagnostic Trouble Codes (DTCs):

    • Even if your Check Engine Light isn't on, a generic OBD-II scanner might reveal charging system-specific codes. Look for codes like P0562 (System Voltage Low), P0563 (System Voltage High), or P0620 (Generator Control Circuit Malfunction). These can provide valuable clues.

  5. When to See a Shop:

    • If the battery light becomes constant, if your car struggles to start, or if you notice other electrical components (like power steering, ABS, or infotainment) acting erratically, it's crucial to have a professional diagnose the issue promptly. Driving with a failing charging system can lead to a complete breakdown and potentially damage other electrical components. A qualified technician can perform more in-depth tests, including load testing the alternator and checking for parasitic draws that might be draining your battery when the car is off.
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