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2018 Outlander SEL CVT Shuddering and Service Engine Light

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Sarah K. · rep 0 · May 22, 5:37 AM · 1 replies · solved · Question

Vehicle: 2018 Mitsubishi Outlander SEL

Hey everyone, I'm hoping someone can offer some advice. My 2018 Mitsubishi Outlander SEL, with about 75,000 miles, has recently started acting up. When I'm accelerating, especially from a stop or at lower speeds, I'm feeling a noticeable shudder or vibration from the transmission. It's not constant, but it's definitely concerning.

To make things worse, the 'Service Engine Soon' light came on a couple of days ago. I haven't had a chance to get the codes pulled yet, but I'm worried this might be a serious CVT issue. I've heard about some problems with Mitsubishi CVTs in the past.

Has anyone experienced something similar with their Outlander, particularly around this model year? What was the cause, and what kind of repairs were needed? Any tips on what I should check first before taking it to a dealership?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:37 AM

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ClearTheCode admin answer: It sounds like your 2018 Mitsubishi Outlander SEL is exhibiting classic symptoms of a potential Continuously Variable Transmission (CVT) issue, especially with the shuddering and the 'Service Engine Soon' light. This is a common concern for many vehicles equipped with CVTs, including some Mitsubishi models.

Here’s what you should consider:

  1. Scan for Diagnostic Trouble Codes (DTCs): The first and most crucial step is to get the 'Service Engine Soon' light scanned. Common OBD-II codes related to CVT issues include:

    • P0700: Transmission Control System Malfunction (a generic code indicating the TCM has detected a fault).
    • P0741: Torque Converter Clutch Circuit Performance or Stuck Off.
    • P0715: Input/Turbine Speed Sensor Circuit Malfunction.
    • P0720: Output Speed Sensor Circuit Malfunction.
    • P0776: Pressure Control Solenoid 'B' Performance/Stuck Off. These codes will provide a much clearer direction for diagnosis.

  2. Check CVT Fluid Condition: While not always a DIY task, a qualified technician should inspect your CVT fluid. Low or degraded fluid can cause shuddering and overheating. Mitsubishi CVTs often require specific fluid types (e.g., DiaQueen CVT Fluid J4 or J3), and using the wrong fluid or neglecting changes can lead to premature wear.

  3. Research Technical Service Bulletins (TSBs) and Recalls: Mitsubishi has issued TSBs for various CVT-related concerns over the years. Your specific model year might have a TSB addressing shuddering or performance issues that could lead to a known fix or updated software. You can often check these with your VIN at a dealership or online resources.

Common Causes for CVT Shuddering and DTCs:

  • Degraded CVT Fluid: Over time, the fluid loses its lubricating and cooling properties, leading to increased friction and shuddering.
  • Faulty Speed Sensors: Incorrect readings from input or output speed sensors can confuse the Transmission Control Module (TCM), causing erratic behavior and triggering warning lights.
  • Torque Converter Issues: Problems with the torque converter clutch can lead to shuddering, especially during lock-up.
  • Valve Body Malfunctions: The valve body controls fluid pressure and flow within the transmission; issues here can affect shifting and overall performance.

When to See a Shop: Given the 'Service Engine Soon' light and the shuddering, it's highly recommended to have your Outlander inspected by a professional automotive technician, preferably one familiar with Mitsubishi CVTs, as soon as possible. Continuing to drive with a significant transmission issue can lead to more severe and costly damage. They can accurately diagnose the specific problem based on the retrieved codes and perform necessary repairs or fluid services.

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