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2020 Q3 Rough Shifting and Hesitation in Lower Gears

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Mike T. · rep 0 · May 26, 3:53 AM · 1 replies · solved · Question

Vehicle: 2020 Audi Q3 45 TFSI

Hi everyone, I'm experiencing some concerning transmission issues with my 2020 Audi Q3 45 TFSI. It has about 45,000 miles on it. Lately, I've noticed a significant rough shift, especially when going from 1st to 2nd gear, and sometimes from 2nd to 3rd.

It feels like a jolt or a hesitation, almost as if the car is struggling to engage the next gear smoothly. It's most noticeable when accelerating from a stop or at low speeds in city traffic. There's no check engine light on yet, but I'm worried this could be a sign of a bigger problem.

Has anyone with a 2020 Q3 or similar model experienced this? Could it be a software issue, or am I looking at something more serious with the S-tronic dual-clutch transmission? Any advice on what to check or mention to the dealer would be great.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:53 AM

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ClearTheCode admin answer:

Rough shifting and hesitation in lower gears on a 2020 Audi Q3, especially with the S-tronic (DSG) transmission, can be a symptom of several underlying issues. While no check engine light is present yet, it's crucial to address this proactively.

Potential Causes:

  1. Software Adaptation: The transmission control unit (TCU) learns your driving style over time. Sometimes, these adaptations can become skewed, leading to less smooth shifts. A TCU software update or reset of the adaptation values can often resolve this.
  2. Mechatronic Unit Issues: The mechatronic unit is the brain and hydraulic control center of the S-tronic transmission. Internal solenoid failures, pressure issues, or electronic faults within this unit are common causes of shifting problems. Common fault codes associated with this can include P17D4 (Valve 3 in sub-transmission 1/2 electrical fault) or P17BF (Hydraulic Pressure Sensor Fault).
  3. Clutch Pack Wear: While less likely at 45,000 miles for normal driving, excessive wear on the dual-clutch packs can lead to slipping or harsh engagement. This would typically be accompanied by a burning smell or more pronounced slipping.
  4. Low/Contaminated Transmission Fluid: The S-tronic requires specific fluid and filter changes at regular intervals (typically around 40,000 miles). If the fluid is low, old, or contaminated, it can affect hydraulic pressure and lubrication, leading to poor shifting.

When to See a Shop:

  • Immediate Action: Given the nature of transmission issues, it's highly recommended to have your Q3 inspected by an Audi specialist or dealership as soon as possible. Continuing to drive with a developing transmission problem can lead to more severe and costly damage.
  • Diagnostic Scan: Even without a check engine light, a comprehensive diagnostic scan using an Audi-specific tool can often reveal pending or intermittent fault codes stored in the TCU (Module 02 - Auto Trans) that wouldn't trigger the dashboard light. Look for codes like P0700 (Transmission Control System Malfunction) or specific gear ratio errors (e.g., P0731 for 1st gear).
  • Fluid Check: Have the transmission fluid level and condition checked. If it's due for a service, performing the S-tronic fluid and filter change might alleviate some symptoms, but it's not a guaranteed fix for mechatronic issues.
  • Warranty: Check if your vehicle is still under its powertrain warranty, as transmission repairs can be very expensive.
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