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2017 Outback CVT Shudder and Noise at Low Speeds

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Sarah K. · rep 0 · May 22, 3:19 AM · 1 replies · solved · Question

Vehicle: 2017 Subaru Outback 2.5i Limited

Hey everyone, I've got a 2017 Subaru Outback 2.5i Limited with about 85,000 miles on it. Lately, I've noticed a distinct shudder or vibration, especially when accelerating from a stop or at very low speeds, like in a parking lot. It almost feels like the transmission is slipping or struggling to engage properly.

There's also a new, subtle whining noise that seems to come from the transmission area, particularly noticeable when the car is cold. I'm worried this might be a sign of a major CVT issue. I've kept up with all my regular maintenance, but I'm not sure if the CVT fluid has ever been changed.

Has anyone else experienced this with their Outback or other Subaru models around this year? What was the fix? Should I be bracing for a costly repair?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:19 AM

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ClearTheCode admin answer:

It sounds like you're experiencing common symptoms associated with Subaru's Continuously Variable Transmissions (CVTs) in certain model years, including the 2017 Outback. The shudder and whining noise are indeed red flags.

  1. Check CVT Fluid Level and Condition: The first step is to have a qualified technician check your CVT fluid level and condition. Subaru CVTs are sensitive to fluid degradation. If the fluid is dark or smells burnt, it indicates significant wear.
  2. Diagnostic Scan: While a shudder might not always trigger a generic OBD-II code, a Subaru-specific diagnostic tool can often reveal transmission-related fault codes (e.g., P0700, P2764) or abnormal sensor readings that point to internal issues.
  3. Review Technical Service Bulletins (TSBs): Subaru has issued TSBs for CVT performance issues, including shuddering and noise, for various models and years. Some TSBs might recommend a specific fluid flush procedure or even a valve body replacement. Your dealership can check if your VIN is covered by any relevant TSBs.

Common Causes:

  • Degraded CVT Fluid: Over time, the fluid loses its lubricating and cooling properties, leading to increased friction and wear within the transmission.
  • Valve Body Issues: The valve body controls fluid pressure and flow within the CVT. Malfunctions here can cause erratic behavior and shuddering.
  • Torque Converter Lock-Up Clutch: Problems with the torque converter's lock-up clutch can also manifest as shuddering during acceleration.

When to See a Shop:

  • You should take your Outback to a Subaru specialist or dealership immediately. Continuing to drive with these symptoms can exacerbate the problem and potentially lead to complete transmission failure. Early diagnosis and intervention, such as a fluid change or valve body replacement, might prevent a full transmission overhaul or replacement, which can be very costly.
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