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2017 Outback CVT Shudder and Hesitation

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Sarah K. · rep 0 · May 25, 2:14 AM · 1 replies · solved · Question

Vehicle: 2017 Subaru Outback 2.5i Premium

Hey everyone, I've got a 2017 Subaru Outback 2.5i Premium with about 85,000 miles on it. Lately, I've been noticing a weird shudder, almost like a slight vibration, when I'm accelerating from a stop or at very low speeds. It's not constant, but it's definitely noticeable and a bit concerning.

Sometimes, it also feels like there's a slight hesitation before the car really gets going, especially after slowing down and then trying to speed up again. There's no check engine light on, and the car otherwise drives fine on the highway. I'm wondering if this is a common CVT issue or if I should be worried about something more serious. Has anyone experienced this with their Outback?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:14 AM

0

ClearTheCode admin answer:

This shudder and hesitation in your 2017 Subaru Outback's CVT (Continuously Variable Transmission) is a known concern for some owners. While CVTs are designed for smooth operation, certain symptoms can indicate issues.

Possible Causes:

  1. CVT Fluid Degradation: Over time, CVT fluid can break down, losing its lubricating and friction-modifying properties. This can lead to internal component wear and the shuddering you're experiencing. Subaru recommends CVT fluid changes at specific intervals, often around 60,000-100,000 miles for severe duty, but it's good practice to check your specific maintenance schedule.
  2. Torque Converter Issues: The torque converter can sometimes be a source of shudder, especially during lock-up. If the internal clutch is failing or operating inefficiently, it can cause vibrations.
  3. Software Glitches: Less common, but sometimes a transmission control module (TCM) software update can resolve minor shifting or hesitation issues.
  4. Internal CVT Wear: In more severe cases, wear within the CVT's belt and pulley system could be the culprit, leading to inconsistent power transfer.

When to See a Shop:

  • Immediately: If the shudder becomes violent, you hear grinding noises, or a check engine light (potentially with code P0700 for transmission control system malfunction) illuminates.
  • Soon: It's highly recommended to have a Subaru-qualified technician diagnose the issue promptly. Ignoring these symptoms can lead to more extensive and costly repairs down the line.

What a Shop Will Do:

  1. Check CVT Fluid: They will inspect the fluid level, condition, and look for any metal particles.
  2. Diagnostic Scan: Even without a CEL, they can scan the TCM for pending codes or unusual sensor readings.
  3. Road Test: Replicate the issue to properly diagnose the conditions under which it occurs.
  4. Recommendations: Based on findings, they might recommend a CVT fluid flush and fill, a software update, or, in worst-case scenarios, a torque converter or full CVT replacement.
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