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2019 S5 S-tronic Hesitation and Jerking at Low Speeds

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Christine P. · rep 0 · May 22, 4:24 AM · 1 replies · solved · Question

Vehicle: 2019 Audi S5 Coupe

Hi all,

I've got a 2019 Audi S5 Coupe (B9) with the S-tronic (DSG) transmission, and I'm experiencing some concerning behavior. When I'm driving at low speeds, especially in stop-and-go traffic or when just starting from a stop, the transmission feels like it hesitates and then jerks into gear. It's not a smooth engagement at all.

It's got about 40,000 miles on it, and I'm wondering if this is a known issue with these transmissions or if it's something I should be really worried about. There's no check engine light yet, but it's definitely not feeling right. Could it be a mechatronic unit issue, or maybe just needs a transmission fluid service?

Any insights from other S5 owners would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:24 AM

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ClearTheCode admin answer:

Transmission hesitation and jerking at low speeds in your 2019 Audi S5's S-tronic (DSG) can be a concerning issue, but it's not entirely unheard of with these sophisticated dual-clutch transmissions.

Common Causes & Diagnostics:

  1. Mechatronic Unit Issues: The mechatronic unit is the control center for the S-tronic transmission, combining the electronic control unit (ECU) with hydraulic actuators. Faults within this unit, such as solenoid issues or pressure sensor failures, can lead to erratic shifting and engagement. While there might not be a check engine light, a scan with an Audi-specific diagnostic tool (like VCDS or ODIS) might reveal transmission-specific fault codes (e.g., in the P17xx range).
  2. Clutch Pack Wear: Over time, the clutch packs within the S-tronic can wear, leading to less smooth engagement. This is more common at higher mileages or with aggressive driving, but premature wear can occur. The transmission adapts to wear, but if it's excessive, it can cause noticeable symptoms.
  3. Transmission Fluid & Filter Service: If the transmission fluid and filter haven't been serviced according to Audi's schedule (typically around 40,000 miles for S-tronic), old fluid can lose its lubricating properties, and a clogged filter can restrict fluid flow, impacting performance. This is a critical maintenance item.
  4. Software Adaptation/Updates: Sometimes, the transmission's control module might benefit from a software update or a basic settings adaptation reset. This can help the transmission re-learn optimal shift points and clutch engagement.

When to See a Shop:

  • Immediately: If the jerking becomes severe, or if you notice any grinding noises or a complete loss of drive.
  • Soon: Given the symptoms, it's highly recommended to have an Audi specialist or dealership perform a full diagnostic scan of the transmission control module. They can check for specific fault codes, analyze live data from the mechatronic unit, and assess clutch wear values. They can also advise on the proper transmission fluid service if it's due or overdue. Addressing these issues early can prevent more costly repairs down the line.
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