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2018 TLX Battery Draining Fast, "Check Charging System" Light

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Ashley M. · rep 0 · May 22, 4:58 AM · 1 replies · solved · Question

Vehicle: 2018 Acura TLX A-Spec

My 2018 Acura TLX A-Spec has been having battery issues lately. The battery seems to drain overnight, and I've had to jump-start it a few times. I replaced the battery about a year ago, so it's relatively new.

Recently, the "Check Charging System" warning light came on, which makes me think it's more than just a bad battery. I'm wondering if it's the alternator, a faulty voltage regulator, or perhaps some kind of parasitic draw that's killing the battery when the car is off.

Has anyone else experienced this with their TLX? What was the fix? I'm trying to avoid an expensive diagnostic if it's a known issue.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:58 AM

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ClearTheCode admin answer:

This issue, especially with a relatively new battery and a 'Check Charging System' light, strongly points towards a problem with your vehicle's charging system or a parasitic draw. Here's what to consider:

  1. Check Alternator Output: The most common cause for this warning and battery drain is a failing alternator. A shop can test its output under load to ensure it's generating sufficient voltage (typically 13.5-14.5 volts) to charge the battery and power the vehicle's electrical systems.
  2. Inspect Wiring and Connections: Loose, corroded, or damaged wiring between the alternator, battery, and main fuse box can impede proper charging. Ensure all battery terminals are clean and tight.
  3. Diagnose Parasitic Draw: If the charging system checks out, a component might be staying on when the car is off, slowly draining the battery. This can be tricky to find and often requires a multimeter to test current draw from various circuits by pulling fuses one by one.
  4. OBD-II Codes: Have the vehicle scanned for diagnostic trouble codes. Common codes related to charging issues include:
    • P0562: System Voltage Low
    • P0622: Generator F-Terminal Circuit Malfunction

When to See a Shop: It's highly recommended to take your 2018 Acura TLX to a qualified mechanic or Acura dealership as soon as possible. Driving with a failing charging system can leave you stranded and potentially damage other electrical components. A professional can accurately diagnose the alternator, check for parasitic draws, and address any related wiring issues safely and effectively.

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