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2018 A4 S-Tronic Hesitation and Jerking - Is this normal?

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Emily N. · rep 0 · May 22, 4:31 AM · 1 replies · solved · Question

Vehicle: 2018 Audi A4 2.0T S-Line

Hi all,

I recently purchased a used 2018 Audi A4 2.0T S-Line, and I've noticed some concerning behavior from the S-Tronic transmission. At low speeds, especially when accelerating from a stop or in stop-and-go traffic, there's a noticeable hesitation before it engages, followed by a slight jerk.

Sometimes, during downshifts, it also feels a bit clunky. Is this characteristic of the S-Tronic (DSG) transmission, or should I be worried about a potential issue? I've heard mixed things about these transmissions.

Any insights from other 2018 A4 owners would be great. Should I get this checked out by a mechanic, or is it just how these dual-clutch transmissions operate?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:31 AM

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ClearTheCode admin answer:

The S-Tronic (Audi's name for their dual-clutch transmission, often a variant of VW's DSG) in your 2018 Audi A4 can exhibit some unique characteristics compared to traditional automatic transmissions. A slight hesitation or 'clunkiness' at very low speeds or during specific shifts is sometimes considered normal behavior due to the nature of dual-clutch operation.

However, significant jerking, prolonged hesitation, or harsh shifts are not normal and could indicate an underlying problem.

Here are potential causes and steps:

  1. Mechatronic Unit Issues: The mechatronic unit is the control center for the S-Tronic transmission, combining the electronic control unit and hydraulic actuators. Failures or issues with this unit are a known concern in some S-Tronic transmissions and can lead to erratic shifting, hesitation, and jerking.
  2. Transmission Fluid Service: While Audi often states 'lifetime' fluid, many specialists recommend a transmission fluid and filter service every 40,000-60,000 miles for optimal performance and longevity, especially if the car is driven hard. If your used A4 is nearing or past this mileage and hasn't had this service, it could contribute to shifting issues.
  3. Software Glitches: Sometimes, transmission control module (TCM) software updates can resolve shifting anomalies. Your dealership can check for any relevant TSBs for your VIN.
  4. Clutch Pack Wear: Over time, the clutch packs can wear, leading to slipping or harsh engagement. This is less common in a 2018 model unless it has very high mileage or has been subjected to extreme driving.

When to See a Shop: If the hesitation and jerking are pronounced, consistent, or worsening, it's highly recommended to have an Audi-specialized mechanic or dealership inspect the vehicle. They can perform a diagnostic scan for transmission fault codes (e.g., P17D8, P17BF, P0726) and assess the mechatronic unit's health and clutch wear. Addressing these issues early can prevent more costly repairs down the line.

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