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2018 Outback CVT shudder and hesitation at low speeds, CEL on

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Dan C. · rep 0 · May 22, 3:14 AM · 1 replies · solved · Question

Vehicle: 2018 Subaru Outback 2.5i Limited

Hey everyone, I'm having an issue with my 2018 Subaru Outback 2.5i Limited. Lately, I've noticed a distinct shuddering and hesitation, especially when accelerating from a stop or at very low speeds, like in stop-and-go traffic.

The Check Engine Light came on a few days ago, and I'm worried it might be something serious with the transmission. The car has about 75,000 miles on it.

Has anyone else experienced this with their Outback? What could be causing this, and what should I do next? I'm hoping it's not a major repair.

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It sounds like you're experiencing a common concern with Subaru's Continuously Variable Transmissions (CVT) from that era. The Check Engine Light (CEL) is a critical indicator, and the shuddering/hesitation points towards a potential issue within the transmission system.

Common Causes & Diagnostics:

  1. OBD-II Code P0700: This is a generic transmission control system malfunction code. It indicates that the Transmission Control Module (TCM) has detected a fault and has illuminated the CEL. The actual specific fault code will be stored within the TCM itself and requires a more advanced scanner to retrieve.
  2. CVT Fluid Condition/Level: While Subaru CVTs are often considered 'sealed for life,' fluid degradation or incorrect levels can lead to performance issues. Over time, the fluid can break down, reducing its lubricating and cooling properties.
  3. Valve Body Issues: The valve body controls the hydraulic pressure within the CVT. Malfunctions here can lead to incorrect pressure application, causing shuddering or hesitation.
  4. Torque Converter Lock-up Clutch: Problems with the torque converter's lock-up clutch can also manifest as shuddering, especially during acceleration or at specific speeds.

When to See a Shop:

  • Immediately: A flashing CEL or any significant change in driving behavior (like severe shuddering or loss of power) warrants immediate attention. Continuing to drive with a transmission issue can lead to more extensive and costly damage.
  • Professional Diagnosis: A Subaru-specific diagnostic tool is essential to retrieve the detailed fault codes from the TCM. This will pinpoint the exact nature of the transmission problem.
  • Subaru Extended Warranty: Be aware that Subaru extended the warranty on many of its CVTs to 10 years/100,000 miles for certain models and years. Check if your 2018 Outback falls under this extended coverage, as it could save you significant repair costs.

Do not delay in getting this diagnosed by a qualified Subaru technician.

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