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2018 911 Carrera S PDK rough downshifts and hesitation

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Robert C. · rep 0 · May 22, 6:50 AM · 1 replies · solved · Question

Vehicle: 2018 Porsche 911 Carrera S

Hey everyone,

I've got a 2018 Porsche 911 Carrera S with the PDK transmission, and lately, I've noticed some unusual behavior. Specifically, when downshifting, especially from 3rd to 2nd or 2nd to 1st at lower speeds, the shifts feel a bit rougher than usual, almost like a slight jolt. It's not always consistent, but it's definitely more pronounced than it used to be.

Also, sometimes when accelerating from a stop or very low speed, there's a slight hesitation before the power fully engages, almost like the clutch is slipping for a split second, or the transmission is taking a moment to decide. It's subtle but noticeable, and it wasn't there when the car was newer.

Has anyone else with a 991.2 generation 911 experienced similar PDK issues? Is this something that might be resolved with a software update, or could it be a sign of something more serious? I'm trying to figure out if this is a common characteristic or if I should be concerned. Any advice or shared experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:50 AM

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ClearTheCode admin answer:

Experiencing rough downshifts and hesitation in a PDK transmission, even in a relatively new Porsche, can be concerning. Here's a breakdown of potential causes and what steps to take:

  1. PDK Software Updates: Porsche frequently releases software updates for its PDK transmissions to refine shifting logic, improve performance, and address minor glitches. Your symptoms could be a result of outdated software. A dealership can check for and apply any available updates.

  2. PDK Fluid and Filter Service: While the PDK fluid is often considered 'lifetime' by some, Porsche does specify service intervals (typically around 60,000 miles or 6 years, depending on the model and driving conditions). Old or degraded fluid can lead to less precise shifting and increased wear. Ensure your vehicle is up-to-date on its transmission fluid and filter service.

  3. PDK Adaptation Values: The PDK system learns your driving style and adapts its shift points over time. Sometimes, these adaptation values can become skewed, leading to suboptimal shifting. A Porsche technician can reset these values, allowing the transmission to 're-learn' from scratch.

  4. Mechatronic Unit or Clutch Pack Wear: In more severe cases, issues could stem from the mechatronic unit (the control brain of the PDK) or wear in the clutch packs. These are less common in newer vehicles but can manifest as inconsistent or harsh shifting. A diagnostic scan would be crucial here.

When to See a Shop:

  • Immediately: If you notice any warning lights on your dashboard (e.g., 'Transmission Fault'), hear unusual noises, or experience a significant loss of power or inability to select gears.
  • Soon: If the symptoms are persistent, worsening, or significantly impacting your driving experience. It's always best to have a qualified Porsche technician diagnose the issue to prevent potential further damage.

What a Shop Will Do:

  • Diagnostic Scan: They will connect to your vehicle's OBD-II port to check for any stored fault codes (e.g., P0700 series codes related to transmission control). Even without a warning light, pending codes might indicate an emerging issue.
  • Check for Technical Service Bulletins (TSBs): Porsche may have issued TSBs related to PDK shifting for your specific model year. A TSB outlines known issues and recommended fixes.
  • PDK Fluid Level and Condition Check: They will inspect the fluid level and condition.
  • Software Update & Adaptation Reset: Perform any necessary software updates and reset adaptation values.

Addressing these issues proactively can help maintain the longevity and performance of your Porsche's PDK transmission.

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