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Jerky shifts and hesitation from S-Tronic on 2020 A4

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Mike T. · rep 0 · May 26, 3:41 AM · 1 replies · solved · Question

Vehicle: 2020 Audi A4 S-Line

I've got a 2020 Audi A4 S-Line with about 45,000 miles, and lately, the S-Tronic transmission has been acting really strange. I'm noticing a distinct hesitation, especially when accelerating from a stop or at low speeds. It also feels like some shifts are getting pretty jerky, particularly between 1st and 2nd gear.

It's not constant, but it's happening often enough to be concerning. There are no warning lights on the dash, but the driving experience is definitely degraded. I'm worried this could be a sign of a bigger problem with the dual-clutch transmission.

Has anyone else experienced similar symptoms with their B9 A4 S-Tronic? What was the cause, and what kind of repairs were needed?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:41 AM

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ClearTheCode admin answer: Jerky shifts and hesitation in Audi's S-Tronic (DSG) transmissions can be attributed to several factors, ranging from routine maintenance needs to more significant component wear.

Here's a breakdown of potential causes and steps:

  1. Transmission Fluid and Filter Service: The S-Tronic transmission requires specific fluid and filter changes, typically every 40,000 miles. If this service is overdue, old or contaminated fluid can lead to poor shift quality and hesitation. This is often the first thing to check.
  2. Mechatronic Unit Issues: The mechatronic unit is the brain of the S-Tronic transmission, controlling clutch engagement and gear selection. Faults within this unit, such as solenoid issues or pressure problems, can cause erratic shifting.
  3. Clutch Pack Wear: While less common at 45,000 miles unless the car has been driven very hard, worn clutch packs can cause hesitation and shuddering.
  4. Software Adaptation: Sometimes, the transmission control module (TCM) might need a software update or adaptation reset to relearn shift points, especially after battery disconnections or certain repairs.
  5. Engine-Related Issues: Less likely for transmission-specific symptoms, but sometimes engine misfires or fuel delivery problems can indirectly affect how the transmission feels. However, this usually triggers engine warning lights.

When to see a shop:

  • Immediately if the problem worsens, or if you notice any new warning lights (e.g., EPC, Check Engine).
  • If the transmission fluid service is up to date and the issue persists.
  • An Audi specialist can perform a diagnostic scan (looking for codes like P17xx or P27xx related to transmission faults) and evaluate the mechatronic unit and clutch packs. Early diagnosis can prevent more costly repairs down the line.
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