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2018 Outback CVT Shuddering and Whining - Is this normal?

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Paul Z. · rep 0 · May 22, 3:21 AM · 1 replies · solved · Question

Vehicle: 2018 Subaru Outback 2.5i Premium

My 2018 Subaru Outback 2.5i Premium, with about 75,000 miles, has started to develop a noticeable shudder when accelerating from a stop, especially uphill. I also hear a faint whining noise from the transmission area at highway speeds. I've kept up with regular oil changes, but haven't touched the CVT fluid yet.

Is this a sign of a major problem, or just typical wear and tear for a CVT? I'm worried about the cost of a replacement. Any advice on what I should check first or if there are any known TSBs for this issue?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:21 AM

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ClearTheCode admin answer:

CVT shudder and whining can be concerning, but it's not always indicative of a catastrophic failure, especially if caught early. Here's what you should consider:

  1. CVT Fluid Condition: Subaru recommends inspecting CVT fluid every 30,000 miles and replacing it under severe driving conditions (towing, mountainous terrain, heavy city traffic) or if issues arise. At 75,000 miles, if the fluid hasn't been changed, it's a strong candidate for causing these symptoms. Old, degraded fluid loses its lubricating and cooling properties, leading to shudder and increased friction noise.
  2. Diagnostic Scan: Even without a Check Engine Light, a professional scan tool can sometimes reveal pending transmission-related trouble codes (e.g., P0741 - Torque Converter Clutch Circuit Performance or Stuck Off) that might not illuminate the dashboard light yet.
  3. Torque Converter: The shudder often points to issues with the torque converter, which can be exacerbated by old fluid. Subaru has issued TSBs (Technical Service Bulletins) in the past for CVT shudder issues, sometimes recommending a software update or, in more severe cases, torque converter or even full CVT replacement.
  4. When to See a Shop: You should take your Outback to a Subaru dealership or a reputable independent shop specializing in Subarus immediately. Explain the symptoms thoroughly. They will likely:
    • Check the CVT fluid level and condition.
    • Perform a diagnostic scan for codes.
    • Check for applicable TSBs or software updates.
    • Test drive the vehicle to confirm the symptoms.

Addressing this promptly can prevent further damage. A CVT fluid change might resolve the issue if it's not too far gone, but if the torque converter or other internal components are already worn, more extensive repairs might be necessary.

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