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2017 Outback CVT Shudder and Hesitation

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Sarah K. · rep 0 · May 25, 2:19 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, and lately, the CVT has been acting really strange. When I accelerate from a stop, especially going uphill, it feels like it shudders or hesitates before it smoothly engages. It's not a violent jerk, but definitely noticeable and concerning.

Sometimes, at highway speeds, I also feel a slight surge. I'm worried this might be a sign of a bigger problem with the transmission. Is this a common issue with these Outback models? I've heard some things about Subaru CVTs.

Has anyone else experienced this? What was the fix? Should I be looking for a specific TSB or recall? I'm trying to avoid a huge repair bill if possible.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 2:19 AM

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ClearTheCode admin answer:

The symptoms you're describing in your 2017 Subaru Outback, specifically shuddering or hesitation during acceleration and potential surging, are unfortunately common complaints related to the Continuously Variable Transmission (CVT) in certain Subaru models from this era. This can often be attributed to issues with the torque converter or internal CVT components.

Here's what you should consider:

  1. Check for Diagnostic Trouble Codes (DTCs): Even if your check engine light isn't on, a pending code like P0700 (Transmission Control System Malfunction) or other specific CVT-related codes might be stored. A professional scan tool can reveal these.
  2. Review TSBs: Subaru has issued several Technical Service Bulletins (TSBs) related to CVT performance, shudder, and torque converter issues for various models, including the Outback, in your model year range. TSB 16-103-16R (for certain 2015-2016 models) and related updates addressed torque converter shudder. While your 2017 model might have different specific TSBs, it's worth having a Subaru dealership or a specialized transmission shop check for all applicable TSBs for your VIN.
  3. Causes:
    • Degraded CVT Fluid: While Subaru CVTs are often "sealed for life," fluid degradation can contribute to performance issues.
    • Torque Converter Clutch (TCC) Issues: A common cause of shudder is the torque converter clutch not engaging or disengaging smoothly.
    • Valve Body Malfunction: Problems within the CVT's valve body can lead to erratic shifting or hesitation.
    • Software Glitches: Sometimes, a simple software update to the Transmission Control Module (TCM) can resolve minor drivability concerns.

When to See a Shop: You should take your Outback to a Subaru dealership or a reputable independent transmission specialist as soon as possible. Continuing to drive with a shuddering CVT can potentially worsen the problem and lead to more expensive repairs. They will be able to:

  • Perform a comprehensive diagnostic scan.
  • Check for any active or pending TSBs for your specific vehicle.
  • Inspect the CVT fluid condition and level.
  • Recommend the appropriate repair, which could range from a software update to a torque converter replacement, or in more severe cases, a full CVT replacement. Early diagnosis can save you significant costs.
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