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2020 Aviator Battery Drain - Electrical Mystery?

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Melissa G. · rep 0 · May 22, 6:07 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Reserve

Hey everyone, hoping someone here has experienced something similar with their Lincoln. I have a 2020 Aviator Reserve, and lately, I've been dealing with a persistent battery drain issue. If I leave it parked for more than a day or two, the battery is completely dead.

I've had the battery tested, and it seems fine, holding a charge once jump-started. It's really frustrating because it's not consistent, but it's happening more frequently now. I've checked for lights left on or anything obvious, but can't find a culprit.

Could this be an electrical module staying awake, or some other parasitic draw? I'm trying to avoid a costly dealership diagnostic if it's something common I can check myself. Any advice on where to start looking would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:07 AM

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ClearTheCode admin answer:

Dealing with a persistent battery drain in a modern vehicle like your 2020 Lincoln Aviator Reserve can be incredibly frustrating, as many electrical systems remain active even when the vehicle is off. This often points to a parasitic draw, where a component continues to consume power.

Here's a breakdown of potential causes and diagnostic steps:

  1. Common Causes of Parasitic Draw:

    • Infotainment System (APIM): The Accessory Protocol Interface Module can sometimes fail to fully shut down, keeping the screen or other components active in the background.
    • Telematics Control Unit (TCU): This module handles connectivity features (like Lincoln Way app services) and can sometimes get stuck in a "wake" state.
    • Door Lock/Window Modules: Faulty switches or modules can prevent the vehicle from entering a deep sleep mode.
    • Aftermarket Accessories: Any non-factory installed devices (dash cams, remote starters) can sometimes be wired incorrectly or malfunction, causing a draw.
    • Failing Alternator Diode: Less common for overnight drain, but a leaky diode can allow current to flow back to the alternator, draining the battery.

  2. Initial Diagnostic Steps:

    • Check for DTCs (Diagnostic Trouble Codes): Even without a check engine light, a failing module might log "ghost codes." A basic OBD-II scanner might show some, but a more advanced scanner (like those used by dealerships) can access all modules. Look for codes related to communication errors or module failures (e.g., U0100 series for communication loss, B-codes for body electrical issues).
    • Perform a Parasitic Draw Test: This involves using a multimeter to measure current draw from the battery when the car is off and asleep. You'll need to wait for the vehicle to enter its sleep mode (can take 20-60 minutes). A healthy draw is typically under 50mA. If it's higher, you can pull fuses one by one to isolate the circuit causing the draw.

  3. When to See a Shop:

    • If you've performed a parasitic draw test and identified a specific circuit but aren't comfortable diagnosing or replacing the component yourself.
    • If you're unable to isolate the draw, as it can be complex to trace in modern vehicles with multiple interconnected modules.
    • If advanced diagnostic tools are needed to read specific module codes or perform software updates that might resolve a module's "wake" issue.
    • If the issue persists after replacing the battery and checking basic connections.

A qualified technician can use specialized equipment to pinpoint the exact source of the draw and perform necessary repairs or module reprogramming.

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