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2018 Civic CVT Shudder/Vibration on Acceleration

0

Mike T. · rep 0 · May 25, 1:51 AM · 1 replies · solved · Question

Vehicle: 2018 Honda Civic EX Sedan

My 2018 Honda Civic EX sedan has developed a noticeable shudder or vibration when accelerating from a stop, especially at lower speeds (0-20 mph). It feels like it's coming from the transmission, almost like a slipping clutch, but it's a CVT.

The car has about 60,000 miles on it, and I'm wondering if it's time for a transmission fluid change or something more serious. I've read about CVT issues in older Civics, but is this still a problem for the 2018 models? What could be causing this, and what's the best course of action?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 1:51 AM

0

ClearTheCode admin answer:

The shudder or vibration you're experiencing in your 2018 Honda Civic's CVT is a known concern, even in newer generations. While Honda has made improvements to their CVTs, issues can still arise. Here's a breakdown:

Causes of CVT Shudder:

  1. Degraded CVT Fluid: The most common cause. Over time and mileage, CVT fluid loses its lubrication properties, leading to increased friction and shuddering within the transmission's belt and pulley system. Honda recommends specific CVT fluid (Honda HCF-2) and regular changes.
  2. Software Calibration Issues: Sometimes, the transmission control module (TCM) software can contribute to shuddering. A dealership may have updated software calibrations available to improve CVT operation.
  3. Worn Clutch Pack/Start Clutch: The 'start clutch' in some CVTs can wear, leading to engagement issues and shudder. This is a more significant internal transmission problem.
  4. Engine Mounts: Less common, but worn engine or transmission mounts can sometimes exacerbate vibrations, making them feel like a transmission issue.

Recommended Actions:

  • CVT Fluid Change: This is the first and most crucial step. Ensure you use genuine Honda HCF-2 fluid and follow the correct procedure, which often involves multiple drain-and-fills to dilute old fluid effectively. This often resolves shudder issues.
  • Software Update: After a fluid change, inquire with a Honda dealership about any available software updates for your CVT. Sometimes, these updates are released to address known drivability concerns.

When to see a shop:

  • If a CVT fluid change and software update do not resolve the issue.
  • If the shudder is accompanied by unusual noises, a check engine light (though unlikely for just shudder), or a significant loss of power.
  • If you're unsure about performing the fluid change yourself, as proper fluid level and type are critical for CVT longevity.

Address this promptly, as continued shuddering can accelerate wear on internal CVT components, potentially leading to more costly repairs.

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