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Rough Shifting / Hesitation from Transmission on 2020 A6 3.0T

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Mike T. · rep 0 · May 26, 3:45 AM · 1 replies · solved · Question

Vehicle: 2020 Audi A6 3.0T Premium

Hey fellow Audi owners, I've got a 2020 Audi A6 3.0T Premium with about 45,000 miles on it, and I've started noticing some concerning behavior from the transmission. Specifically, at lower speeds, especially when accelerating from a stop or during low-speed maneuvers, there's a noticeable hesitation and sometimes a rough, jerky shift.

It feels like the car is struggling to decide which gear to be in, or maybe it's the S-tronic dual-clutch acting up. It's not constant, but it's happening more frequently now. Has anyone experienced similar issues with their A6's S-tronic transmission? Could it be a software issue, or something more serious like the mechatronic unit?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:45 AM

0

ClearTheCode admin answer:

Rough shifting and hesitation in Audi's S-tronic (DSG) transmissions can be a cause for concern, but it's important to understand the common causes. The S-tronic is a sophisticated unit, and sometimes these symptoms can be resolved without major repairs.

Potential Causes for Rough Shifting/Hesitation:

  1. Transmission Fluid (ATF) Degradation: The transmission fluid can degrade over time and mileage, leading to less efficient lubrication and cooling, which affects shift quality. While Audi often states 'lifetime' fluid, many enthusiasts and mechanics recommend a fluid and filter change around 40k-60k miles for optimal performance, especially with high-performance driving.
  2. Mechatronic Unit Issues: The mechatronic unit is the 'brain' of the S-tronic transmission, controlling clutch engagement and gear selection. Faults in this unit, often due to solenoid issues or internal leaks, can lead to erratic shifting. This is a more serious and costly repair.
  3. Software Adaptation: The transmission control module (TCM) constantly adapts to your driving style. Sometimes, an adaptation reset or a software update from Audi can smooth out shifting behavior.
  4. Clutch Pack Wear: While less likely at 45,000 miles unless the car has been driven very aggressively, worn clutch packs can cause hesitation and jerky shifts.

What to Do:

  • Transmission Fluid Service: Consider having your transmission fluid and filter changed. Ensure an Audi-approved fluid (like Pentosin FFL-2 or equivalent) is used, and the correct fill procedure is followed.
  • Software Update/Adaptation Reset: An Audi dealer can check for any available software updates for your TCM and perform a basic settings adaptation reset, which can sometimes resolve minor shifting quirks.
  • Diagnostic Scan: A professional diagnostic scan using VCDS or ODIS will be crucial. Look for fault codes related to the transmission control module (TCM), such as P17D8 - Clutch Temperature Monitoring or various codes related to solenoid valves within the mechatronic unit.

When to See a Shop:

If a transmission fluid service and software update don't resolve the issue, or if the problem worsens, it's imperative to take your A6 to an Audi specialist or dealership. Issues with the mechatronic unit or clutch packs require specialized tools and expertise to diagnose and repair. Ignoring these symptoms can lead to more extensive and expensive transmission damage.

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