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2017 MDX Battery Draining Fast & VSA Light On

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James R. · rep 0 · May 22, 5:02 AM · 1 replies · solved · Question

Vehicle: 2017 Acura MDX SH-AWD

Hello fellow Acura owners,

I'm having a couple of issues with my 2017 Acura MDX SH-AWD that I'm trying to figure out. First, the battery seems to be draining really fast. If I leave it parked for more than a day or two, it's often dead and needs a jump start. I've had the battery tested, and it seems okay, but it keeps happening.

Second, the VSA (Vehicle Stability Assist) warning light has been coming on intermittently. It usually comes on after I've been driving for a bit, and sometimes it goes off on its own, but it's concerning. I'm wondering if these two problems could be related in some way.

Has anyone experienced similar issues with their MDX? Could a parasitic draw cause the VSA light, or is it a separate sensor problem? Any insights or diagnostic tips would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:02 AM

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ClearTheCode admin answer:

These two issues, a rapidly draining battery and an intermittent VSA light, can indeed be related in an Acura MDX, as low voltage can cause various electronic systems to malfunction or trigger warning lights. It's a common scenario where one problem can cascade into others.

Here's a breakdown and what to investigate:

  1. Battery Drain (Parasitic Draw):

    • Causes: A parasitic draw means something in your vehicle is continuously drawing power from the battery even when the car is off. Common culprits include:
      • Aftermarket accessories (dash cams, remote starters)
      • Stuck relays
      • Faulty modules (e.g., infotainment, hands-free link, climate control) that aren't properly 'sleeping'
      • A failing alternator that isn't charging the battery effectively, leading to a perceived drain.
    • Diagnosis: A qualified technician can perform a parasitic draw test using a multimeter to isolate the circuit responsible for the excessive drain.

  2. VSA Light On:

    • Causes: The VSA system relies on various sensors (wheel speed sensors, steering angle sensor, yaw rate sensor) and proper voltage.
      • Low Voltage: If your battery is consistently low or failing, the VSA system might not receive adequate power, causing it to fault and trigger the warning light. This is a very common reason for intermittent VSA lights.
      • Faulty Sensor: A specific VSA sensor could be failing.
      • Brake Light Switch: A faulty brake light switch can sometimes trigger VSA and other warning lights.
    • Diagnosis: An OBD-II scanner can retrieve diagnostic trouble codes (DTCs) related to the VSA system. Common codes might include C1800 (VSA System Malfunction) or codes related to specific wheel speed sensors (e.g., P0500 for Vehicle Speed Sensor).

When to see a shop:

  • Immediately: If the battery drain is severe and you're constantly needing jump starts, or if the VSA light stays on consistently, it's best to have it checked by a professional.
  • For Battery Drain: A shop can perform a comprehensive battery and charging system test, followed by a parasitic draw test if necessary.
  • For VSA Light: They can scan for VSA-specific fault codes, which will pinpoint the exact sensor or system component that is malfunctioning. Addressing the battery drain first might resolve the VSA light issue if it's voltage-related.
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