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2018 S3 S-Tronic hesitation/jerking at low speeds – Mechatronics issue?

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David L. · rep 0 · May 25, 3:16 AM · 1 replies · solved · Question

Vehicle: 2018 Audi S3 Prestige

Hello fellow Audi enthusiasts,

I'm experiencing some concerning behavior with the S-Tronic (DSG) transmission in my 2018 Audi S3 Prestige. It's most noticeable at low speeds, particularly when accelerating from a stop or creeping in traffic.

The car often hesitates or gives a noticeable jerk, almost like a rough clutch engagement. Sometimes, when downshifting to a stop, it feels a bit clunky. It's not constant, but it's happening frequently enough to be worrying.

I've heard about mechatronics unit issues in these transmissions. Could this be what I'm dealing with? Are there any specific diagnostic codes or symptoms I should look for? Any advice or shared experiences would be incredibly helpful.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:16 AM

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ClearTheCode admin answer:

S-Tronic (DSG) transmission hesitation or jerking at low speeds is a known concern for some Audi models, including the S3. This dual-clutch transmission is complex, and such symptoms can stem from several sources, with the mechatronics unit being a common culprit.

Here are potential causes and steps:

  1. Mechatronics Unit Failure: The mechatronics unit is the control center of the DSG, combining the transmission control unit (TCU) and hydraulic actuators. Failures in this unit can lead to erratic shifting, hesitation, and jerking. This is a significant repair.
  2. Clutch Pack Wear: Over time, the clutch packs can wear down, leading to slipping or rough engagement. This is more common in vehicles with higher mileage or those driven aggressively.
  3. Transmission Fluid and Filter: The S-Tronic transmission requires regular fluid and filter changes (typically every 40,000 miles). Old or contaminated fluid can impair shifting performance. Ensure this maintenance is up to date.
  4. Software Adaptation: Sometimes, the transmission's adaptive learning can get 'confused,' leading to suboptimal shifting. A dealership can perform a basic settings adaptation or a software update to recalibrate the transmission.
  5. Sensor Issues: Faulty speed sensors or other internal transmission sensors can send incorrect data to the TCU, causing shifting problems.

When to See a Shop:

  • Immediately: If the hesitation or jerking is severe, frequent, or accompanied by warning lights on the dashboard. Continued driving with a significant transmission issue can lead to further, more costly damage.
  • Diagnostic Scan: A professional diagnostic scan using specialized Audi tools (like ODIS) is crucial. Common OBD-II codes related to DSG issues include:
    • P1740: Clutch temperature monitoring
    • P17D8: Torque limitation due to clutch temperature
    • P17BF: Hydraulic pump play
    • P189C: Function restriction due to insufficient pressure build-up
    • P0726: Engine speed input circuit range/performance

An Audi specialist will be able to read specific transmission fault codes and perform guided diagnostics to accurately identify whether it's a mechatronics issue, clutch wear, or something else.

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