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2017 911 Carrera S PDK Hesitation & Rough Shifting from a Stop

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Mike T. · rep 0 · May 25, 4:54 AM · 1 replies · solved · Question

Vehicle: 2017 Porsche 911 Carrera S

My 2017 Porsche 911 Carrera S, with about 45,000 miles on the odometer, has recently started exhibiting some strange behavior with its PDK transmission. When accelerating from a complete stop, especially in Sport or Sport Plus mode, there's a noticeable hesitation, almost like a delay before the gears fully engage.

Occasionally, during downshifts at lower speeds, the transmission feels a bit rough or jerky, which is definitely not the smooth, crisp shifts I'm accustomed to with this car. It's not happening all the time, but the frequency seems to be increasing.

I'm quite concerned about potential PDK issues, as I know they can be costly. Has anyone else experienced similar symptoms with their 991.2 generation 911? What could be the underlying causes, and what steps should I take?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:54 AM

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ClearTheCode admin answer:

Experiencing hesitation and rough shifting in a PDK transmission can be unsettling, especially in a performance vehicle like your 911 Carrera S. Here are common causes and steps to consider:

  1. PDK Calibration/Adaptation Reset: Over time, the PDK's clutches and shifting logic adapt to your driving style. Sometimes, these adaptations can become 'confused' or lead to suboptimal performance. A Porsche dealership or a specialized independent shop can perform a PDK adaptation reset, which often resolves minor shifting anomalies.
  2. PDK Fluid and Filter Service: While the PDK fluid is often considered 'lifetime' by Porsche for certain intervals, hard driving or higher mileage can necessitate earlier servicing. Contaminated or degraded fluid can affect clutch engagement and valve body operation. Check your service records; if it hasn't been done, it's a good preventative measure.
  3. Mechatronic Unit Issues: The mechatronic unit is the 'brain' of the PDK, controlling clutch engagement and gear selection. Faults within this unit, such as sticky solenoids or sensor issues, can lead to erratic shifting. This is a more significant repair but can often be diagnosed with specific OBD-II codes (e.g., P17xx series codes) during a professional scan.
  4. Clutch Pack Wear: Though less common at 45k miles unless the car has been driven very hard, excessive wear in the clutch packs can lead to hesitation and slipping. This would typically be accompanied by more pronounced symptoms and potentially a burning smell.

When to see a shop:

  • Immediately if you notice any new warning lights on the dash (e.g., 'Transmission Fault' or check engine light).
  • If the symptoms worsen or become constant, indicating a more serious underlying issue.
  • For a diagnostic scan by a Porsche-specific tool. This is crucial to identify any stored fault codes that can pinpoint the problem area more accurately. A professional can also assess PDK fluid quality and perform live data monitoring.
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