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2018 Outback CVT Shudder and Hesitation - What's going on?

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Jason D. · rep 0 · May 22, 3:14 AM · 1 replies · solved · Question

Vehicle: 2018 Subaru Outback 2.5i Limited

Hey everyone, I've got a 2018 Subaru Outback 2.5i Limited with about 75,000 miles on it, and lately, I've been noticing a weird shudder or hesitation from the transmission. It's most noticeable when I'm accelerating from a stop or at low speeds, like in stop-and-go traffic. It feels like the car isn't sure which 'gear' to be in, or maybe it's slipping a bit.

There's no check engine light on, and it doesn't happen all the time, but it's definitely getting more frequent. I'm worried it might be a sign of a bigger CVT problem. Has anyone else experienced this with their Outback? What did you do to fix it, or what should I be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:14 AM

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ClearTheCode admin answer:

Experiencing shudder or hesitation from a CVT can be concerning, but there are several potential causes and diagnostic steps.

Possible Causes:

  • Degraded CVT Fluid: Over time and mileage, CVT fluid can break down, losing its lubricating and friction properties, leading to inconsistent operation.
  • Valve Body Issues: The valve body controls fluid pressure and flow within the transmission. Malfunctions here can cause erratic shifting or shudder.
  • Torque Converter Lock-Up Problems: The torque converter's lock-up clutch can sometimes cause shudder if it's not engaging or disengaging smoothly.

Diagnostic Steps & When to See a Shop:

  1. Check CVT Fluid: While not always user-serviceable, a qualified technician can check the fluid level and condition. Dark, burnt-smelling fluid is a strong indicator of an issue.
  2. Diagnostic Scan: Even without a Check Engine Light, a professional scan tool can sometimes reveal pending codes (like P0700 for Transmission Control System Malfunction) or provide live data on CVT operation that might pinpoint the problem.
  3. CVT Fluid Flush/Replacement: If the fluid is old or degraded, a fluid service might resolve the issue. However, this should only be done by a Subaru dealer or specialist, as specific fluid types and procedures are required.
  4. Professional Inspection: If the shudder worsens, becomes more frequent, or if a Check Engine Light does illuminate, it's crucial to have a Subaru-certified technician inspect the vehicle. They can perform more in-depth diagnostics, including pressure tests and internal component checks, to determine if a valve body replacement or even a CVT unit replacement is necessary. Ignoring these symptoms can lead to more severe and costly damage.
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