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2019 Outlander Sport LE - Drivetrain Whine and AWD Light Flashing

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Mike T. · rep 0 · May 25, 4:06 AM · 1 replies · solved · Question

Vehicle: 2019 Mitsubishi Outlander Sport LE

I'm having some issues with my 2019 Mitsubishi Outlander Sport LE. Recently, I've noticed a distinct whining noise coming from what sounds like the rear or underneath the car, especially when I'm accelerating or cruising at highway speeds. It's not constant, but it's definitely there.

To make matters worse, the AWD warning light on my dashboard has started flashing intermittently. Sometimes it stays on solid for a bit, then goes off. I'm concerned this could be a problem with the AWD system or differential. Has anyone experienced a similar issue with their Outlander Sport? What should I be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:06 AM

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ClearTheCode admin answer:

The whining noise combined with an intermittent or solid AWD warning light in your 2019 Mitsubishi Outlander Sport LE strongly suggests an issue within the all-wheel-drive system or associated drivetrain components. This isn't a problem to ignore, as it can escalate quickly.

Common Causes for Whining & AWD Light:

  1. Rear Differential Issues: The rear differential is a common source of whining noises, especially under load. This can be due to low or degraded differential fluid, worn gears, or failing bearings. If ignored, this can lead to catastrophic failure.
  2. Transfer Case Problems: The transfer case distributes power between the front and rear axles. Issues with its internal components or fluid can cause noise and trigger AWD system warnings.
  3. AWD Control Module/Sensors: The AWD system relies on various sensors (e.g., wheel speed sensors, yaw rate sensor) and a control module. A fault in any of these can cause the AWD light to illuminate. Codes like C1200 (ABS/AWD communication) or specific P-codes related to AWD system engagement might appear.
  4. CV Axle or Driveshaft Issues: Worn universal joints (U-joints) in the driveshaft or failing CV joints in the rear axles can also produce whining or clicking noises, especially during turns or acceleration.
  5. Tire Size Mismatch (less common if original tires): If tires of different sizes are installed, it can put undue stress on the AWD system, leading to premature wear and warning lights.

Diagnostics & What to Do:

  1. Scan for Codes: A professional scan tool is essential to read specific AWD system codes (C-codes or P-codes) from the AWD control module, not just the engine ECU. These codes will provide crucial diagnostic direction.
  2. Check Fluid Levels: Have a technician check the fluid levels and condition of both the transfer case and the rear differential. Low or contaminated fluid is a leading cause of component failure.
  3. Visual Inspection: A mechanic will inspect the driveshaft, CV axles, and differential for any signs of leaks, damage, or excessive play.
  4. Road Test: A diagnostic road test can help pinpoint the exact conditions under which the noise occurs.

When to See a Shop:

  • Immediately: A whining noise from the drivetrain, especially coupled with a flashing AWD light, indicates a serious problem. Continued driving can lead to significant and expensive damage to the differential, transfer case, or other drivetrain components. If the AWD system fails completely, you could lose power to some wheels, creating a safety hazard. Get it inspected by a Mitsubishi specialist as soon as possible.
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