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2020 Aviator Battery Draining Fast - Electrical Gremlin?

0

David L. · rep 0 · May 22, 6:07 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Reserve

Hey everyone,

I'm having a really frustrating issue with my 2020 Lincoln Aviator Reserve. The battery keeps draining, especially if the car sits for more than a day or two. I've had the battery tested at a local auto parts store, and they said it's still good, holding a charge fine after they topped it off.

It feels like something is staying on and drawing power even when the car is off. I've checked all the obvious things like lights being left on, but everything seems normal. It's really inconvenient to come out to a dead car, especially with all the electronics in these newer vehicles.

Has anyone else experienced this with their Aviator or other modern Lincoln models? What are some common culprits for parasitic draws in these cars? Any advice on how to track this down before I have to take it to the dealer?

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer:

It sounds like your 2020 Lincoln Aviator is experiencing a parasitic draw, which is a common issue in modern vehicles with complex electrical systems. Here's a breakdown of what might be happening and how to approach it:

  1. Initial Checks:

    • Battery Health: Even if it tested 'good,' ensure the battery is fully charged and the terminals are clean and tight. A weak battery can sometimes mimic a parasitic draw issue.
    • Alternator Output: Confirm your alternator is charging correctly (typically 13.5-14.5 volts) when the engine is running. A failing alternator can lead to a constantly undercharged battery.

  2. Diagnosing Parasitic Draw:

    • Multimeter Test: You can perform a basic parasitic draw test using a multimeter. With the car off and all doors closed (you might need to trick the latch sensors), disconnect the negative battery terminal and connect the multimeter in series between the battery post and the negative cable. Wait about 30-60 minutes for all modules to 'go to sleep.' A normal draw should be under 50 milliamps (0.05 amps). If it's significantly higher, you have a draw.
    • Fuse Pulling: If the draw is high, start pulling fuses one by one while monitoring the multimeter. When the amperage drops significantly, you've identified the circuit causing the draw. This helps narrow down the problematic module or component.

  3. Common Culprits in Lincoln Vehicles (2016-2026):

    • Infotainment System (SYNC): The SYNC module can sometimes fail to power down completely, especially after updates or if there's a software glitch.
    • Telematics Control Unit (TCU): The modem for Lincoln Connect services can occasionally stay awake, constantly trying to communicate.
    • Door Modules/Liftgate Module: Faulty switches or modules in the doors or power liftgate can prevent the vehicle from entering sleep mode.
    • Keyless Entry/Passive Anti-Theft System (PATS): Issues with these systems can keep modules active.

  4. Check for Diagnostic Trouble Codes (DTCs):

    • Even without a check engine light, a professional scan tool can reveal 'U' codes (network communication issues) or 'B' codes (body electrical issues) that point to a module staying awake or malfunctioning. For example, a P0562 (System Voltage Low) might appear if the battery is consistently drained, but U-codes are more indicative of module communication problems.

  5. When to See a Shop:

    • If you're uncomfortable performing the multimeter test or can't pinpoint the circuit, it's best to take your Aviator to a Lincoln dealership or a reputable independent shop. They have specialized diagnostic tools (like Ford's IDS/FDRS) that can communicate with individual modules, monitor their sleep status, and identify the exact source of the parasitic draw much more efficiently. They can also check for and apply any relevant software updates that might resolve module sleep issues.
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