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2020 MDX SH-AWD Battery Drains Overnight, Even After Replacement

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Mike T. · rep 0 · May 26, 3:30 AM · 1 replies · solved · Question

Vehicle: 2020 Acura MDX SH-AWD

Hi everyone,

I'm at my wit's end with my 2020 Acura MDX SH-AWD. For the past few months, the battery keeps dying overnight. I've already replaced the battery once, thinking it was just an old battery, but the problem persists. I'm waking up to a dead car almost every other morning.

I don't leave any lights on, and I make sure everything is off when I park it. I'm worried there's some kind of parasitic draw or electrical issue that's slowly killing my battery. It's incredibly inconvenient and unreliable.

Has anyone else experienced a persistent battery drain with their 2020 MDX? What was the culprit?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:30 AM

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ClearTheCode admin answer:

A persistent battery drain, especially after replacing the battery, strongly indicates a parasitic draw. This means something in your 2020 Acura MDX is consuming power even when the vehicle is turned off. Finding a parasitic draw can be challenging but is definitely diagnosable.

  1. Confirm Charging System: First, ensure your alternator is charging the battery correctly. A failing alternator won't recharge the battery, leading to repeated drain. Most auto parts stores can test your alternator and battery for free. A common OBD-II code for charging issues is P0562 (System Voltage Low).
  2. Check for Aftermarket Accessories: If you have any aftermarket accessories installed (e.g., remote start, dash cam, stereo system, tracking devices), these are often prime suspects for parasitic draws if not wired correctly.
  3. Perform a Parasitic Draw Test: This involves connecting a multimeter in series with the battery's negative terminal and checking the amperage draw after the vehicle has 'gone to sleep' (which can take 15-30 minutes after turning off). A normal draw is typically under 50 milliamps (0.05 amps). If it's higher, you can then pull fuses one by one to isolate the circuit causing the draw.
  4. Common MDX Draw Sources: For the MDX, common culprits can include: a faulty hands-free link (HFL) module, a stuck relay in the fuse box, a malfunctioning infotainment unit not fully shutting down, or a faulty door/hood switch keeping a light on or module active.

When to See a Shop: If you're uncomfortable performing a parasitic draw test yourself, or if you can't isolate the circuit, it's essential to take your MDX to an Acura dealership or a reputable automotive electrical specialist. They have the specialized tools and expertise to systematically diagnose and pinpoint the source of the parasitic draw. Ignoring this issue can lead to premature battery failure, damage to electrical components, and leaves you stranded.

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