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Rough Shifting and Hesitation - 2017 Audi A5 Coupe (S tronic)

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Mike T. · rep 0 · May 26, 3:44 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A5 Coupe 2.0T Quattro

Hi everyone,

I'm experiencing some concerning transmission behavior in my 2017 Audi A5 Coupe, 2.0T Quattro, which has the S tronic (dual-clutch) transmission. Lately, I've noticed rough shifts, particularly from 1st to 2nd gear and sometimes 2nd to 3rd. It feels like a jolt or hesitation before the gear engages fully.

It's most noticeable when the car is cold, but it can happen after driving for a while too. I've also felt a slight hesitation when accelerating from a stop, almost like it's taking a moment to decide which gear to be in. The car has about 70,000 miles on it.

Is this normal for S tronic transmissions at this mileage, or should I be worried? What could be causing this? Thanks for any insights!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:44 AM

0

ClearTheCode admin answer:

Rough shifting and hesitation in an Audi A5 with an S tronic (DSG) transmission can be indicative of several issues, especially as the vehicle approaches higher mileage. The S tronic is a sophisticated unit, and its performance relies on precise synchronization.

Common Causes:

  • Mechatronic Unit Issues: The mechatronic unit is the 'brain' of the S tronic, controlling clutch engagement and gear selection. Faults in this unit, often due to solenoid failures or pressure issues, are common.
  • Clutch Pack Wear: Over time, the dual-clutch packs can wear out, leading to slipping, juddering, and rough shifts. This is more prevalent with aggressive driving or stop-and-go traffic.
  • Transmission Fluid (ATF) Degradation/Low Level: The S tronic requires specific, high-quality fluid. Old, contaminated, or low fluid levels can significantly impact shifting performance.
  • Software Glitches: Outdated transmission control module (TCM) software can sometimes cause sub-optimal shifting logic.
  • Engine Mounts/Transmission Mounts: Worn mounts can amplify the sensation of rough shifts, making them feel more severe than they are.

Troubleshooting Steps:

  1. Check for DTCs: A professional scan tool can read diagnostic trouble codes (DTCs) from the Transmission Control Module (TCM). Look for codes like P0700 (Transmission Control System Malfunction), P17D8 (Torque Limitation Due to Clutch Temperature), or P17BF (Hydraulic Pressure Sensor Error).
  2. Transmission Fluid Service: If it hasn't been done, consider a transmission fluid and filter service. Audi recommends this service around 40k-60k miles for S tronic units. Ensure the correct fluid is used and the fill procedure is followed precisely.
  3. Software Update: Inquire with an Audi dealer about any available software updates for your TCM. Sometimes, Audi releases updates to improve shift quality.

When to See a Shop:

Given the mileage and the nature of the symptoms, it's highly recommended to have your 2017 Audi A5 inspected by an Audi specialist or an independent shop experienced with S tronic transmissions. They can:

  • Perform a thorough diagnostic scan for specific fault codes.
  • Check transmission fluid levels and condition.
  • Assess the health of the mechatronic unit and clutch packs. Early diagnosis can sometimes prevent more extensive and costly repairs.
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