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2017 ILX battery draining overnight, no obvious cause

0

Mike T. · rep 0 · May 25, 3:44 AM · 1 replies · solved · Question

Vehicle: 2017 Acura ILX Premium

My 2017 Acura ILX Premium has developed a frustrating problem: the battery keeps dying overnight. I've had to jump-start it three times in the last two weeks. I'm positive I'm not leaving any lights on, and all accessories are off when I park it.

I had the battery tested at a local auto parts store, and they said it's still good. The alternator also checked out fine. It seems like something is drawing power even when the car is off, but I can't figure out what.

Has anyone else with a 2016-2018 ILX experienced a mysterious battery drain? What was the culprit in your case? I'm at my wit's end trying to diagnose this!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:44 AM

0

A recurring battery drain, even with a healthy battery and alternator, strongly suggests a parasitic draw. This means a component or system in your 2017 Acura ILX is consuming power even when the vehicle is supposedly off. Diagnosing parasitic draws can be tricky but is definitely solvable.

Causes and Potential Solutions:

  1. Parasitic Draw Test: This is the primary diagnostic step. A technician uses a multimeter to measure the current draw from the battery with the car off and 'asleep.' The acceptable draw is usually very low (e.g., 20-50 milliamps). If it's higher, they then systematically pull fuses to isolate the circuit responsible.
  2. Common Culprits:
    • Infotainment/Navigation System: A module that isn't shutting down correctly.
    • Aftermarket Accessories: Anything installed after the factory (e.g., alarm systems, dash cams, remote starters) can sometimes be wired incorrectly or malfunction.
    • Bluetooth Modules: Sometimes these can stay active.
    • Glove Box/Trunk Lights: A light that stays on due to a faulty switch.
    • Relays: A stuck relay can keep a circuit energized.
    • Faulty Door/Hood Switches: If the car thinks a door is ajar, it might keep certain systems active.
  3. Battery Age/Health: While your battery tested 'good,' sometimes a battery can have good voltage but poor cranking amps, especially if it's nearing the end of its life (typically 3-5 years). A deep cycle test might reveal more.

When to See a Shop:

  • Immediately, as repeated jump-starts can stress your vehicle's electrical system and potentially damage sensitive electronics.
  • If you're not comfortable performing a parasitic draw test yourself (it requires specific tools and knowledge to do safely and accurately).
  • An automotive electrical specialist or an Acura dealership will have the necessary diagnostic equipment and wiring diagrams to efficiently locate the source of the draw. There are typically no direct OBD-II codes for a parasitic draw itself, but low battery voltage could trigger various 'low voltage' or 'system malfunction' codes for other modules.
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