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2018 Outlander CVT Shuddering and Service Engine Soon Light

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James R. · rep 0 · May 22, 5:37 AM · 1 replies · solved · Question

Vehicle: 2018 Mitsubishi Outlander SEL

Hey everyone,

I'm having some worrying issues with my 2018 Mitsubishi Outlander SEL, which has about 75,000 miles on it. Lately, I've noticed a distinct shuddering or vibration, especially when accelerating from a stop or at lower speeds. It feels like the transmission is struggling to engage smoothly.

To make matters worse, the 'Service Engine Soon' light came on a few days ago. I'm really concerned this might be a serious transmission problem. I've heard some stories about CVT issues with these models, and I'm wondering if anyone else has experienced something similar.

What could be causing this, and what should I do? Is this a known issue for the 2018 Outlander? Any advice on diagnostics or what to tell the dealership would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It sounds like you're experiencing common symptoms associated with Continuous Variable Transmission (CVT) issues in your 2018 Mitsubishi Outlander. The shuddering and 'Service Engine Soon' light are clear indicators that the transmission control module (TCM) has detected a fault.

Here's what you should know and do:

  1. Get a Diagnostic Scan: The first and most crucial step is to have the vehicle scanned for diagnostic trouble codes (DTCs). While the 'Service Engine Soon' light is on, there will be stored codes. Common codes related to CVT shuddering and performance issues include P0741 (Torque Converter Clutch Circuit Performance or Stuck Off) or P0700 (Transmission Control System Malfunction Indicator Lamp Request), which often points to other underlying transmission codes.
  2. Potential Causes:
    • Degraded CVT Fluid: Over time, CVT fluid can break down, losing its lubricating and friction properties, leading to shuddering and overheating. Mitsubishi recommends specific fluid change intervals, often around 30,000-60,000 miles depending on driving conditions.
    • Worn Torque Converter: The torque converter clutch can wear out, causing slippage and shuddering, especially during acceleration.
    • CVT Belt/Pulley Wear: Internal components like the steel belt or pulley surfaces can wear, leading to inconsistent power transfer and vibrations.
    • Transmission Control Module (TCM) Issues: Less common, but the TCM itself could be faulty, sending incorrect signals.
  3. Check for TSBs/Recalls: Mitsubishi has issued Technical Service Bulletins (TSBs) for CVT performance issues on various models and years. It's worth checking with a Mitsubishi dealership if there are any active TSBs or extended warranty programs that might cover your vehicle's symptoms.
  4. When to See a Shop: You should schedule an appointment with a reputable automotive shop, preferably a Mitsubishi dealership or a specialist familiar with CVTs, as soon as possible. Continuing to drive with a shuddering transmission can exacerbate the damage and lead to more costly repairs. Be prepared for potential CVT fluid replacement, torque converter replacement, or even a full transmission overhaul or replacement depending on the diagnosis. Ensure they use genuine Mitsubishi CVT fluid if a fluid change is performed.
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