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PDK Transmission Hesitation and Rough Shifts on 2017 911 Carrera (991.2)

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Mike T. · rep 0 · May 25, 4:49 AM · 1 replies · solved · Question

Vehicle: 2017 Porsche 911 Carrera (991.2)

Hi all,

I'm experiencing some concerning behavior with the PDK transmission in my 2017 Porsche 911 Carrera (991.2), which has around 45,000 miles. Lately, I've noticed a distinct hesitation when accelerating from a stop, almost like a slight delay before the power fully engages. It's not consistent, but it's happening more frequently.

Additionally, some of the shifts, particularly in lower gears (1st to 2nd, 2nd to 3rd), feel a bit rougher than they used to. They're not violently harsh, but definitely not as smooth and seamless as I'd expect from a PDK. It's more noticeable when the car is cold, but can occur even after it's warmed up.

Is this a known issue with the 991.2 PDKs? I've always been meticulous with maintenance, but I'm worried about potential transmission problems. Any advice or similar experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:49 AM

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ClearTheCode admin answer:

It's understandable to be concerned about your PDK transmission, especially given its reputation for smoothness. Hesitation and rough shifts in a 2017 Porsche 911 Carrera (991.2) can point to several potential issues.

  1. Common Causes & Diagnostics:

    • PDK Fluid and Filter Service: Porsche recommends specific service intervals for PDK fluid and filter replacement, typically around 60,000 miles or 6 years, depending on the model and driving conditions. If this service is due or overdue, old fluid can lose its lubricating properties and lead to less efficient clutch engagement and shifting. The filter can also become clogged.
    • PDK Software Adaptation/Update: The PDK system is highly sophisticated and relies on complex software. Over time, the transmission's adaptive learning can sometimes lead to suboptimal shift patterns, or there might be a newer software update available that addresses known shifting issues. A dealership can check for and apply relevant software updates and perform a PDK adaptation reset.
    • Clutch Pack Wear: While less common at 45,000 miles with normal driving, the wet clutch packs within the PDK can experience wear. This would typically manifest as slipping, delayed engagement, or harsher shifts. This usually requires more in-depth diagnosis.
    • Mechatronic Unit Issues: The mechatronic unit is the 'brain' of the PDK, combining the electronic control unit and hydraulic control unit. Failures here are rare but can lead to a wide range of shifting problems. Diagnostic codes (e.g., P17xx series) would usually be present.

  2. When to See a Shop:

    • Promptly: While not an immediate emergency, it's advisable to have the PDK system inspected by a Porsche specialist or dealership soon. Continued driving with a developing transmission issue can exacerbate the problem and lead to more costly repairs.
    • Professional Diagnosis: A Porsche technician can connect to the vehicle's diagnostic system to check for any stored fault codes specific to the PDK. They can also perform a visual inspection, check fluid levels (though this is a complex procedure for PDK), and assess the clutch wear values. They will also be able to determine if a software update or adaptation reset is warranted before considering mechanical repairs.
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