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Jerky Shifts & Hesitation in my 2018 Audi A5 S-Tronic - Mechatronic Unit?

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Chris P. · rep 0 · May 22, 4:31 AM · 1 replies · solved · Question

Vehicle: 2018 Audi A5 Sportback Premium Plus

Hey everyone,

I've been noticing some really rough and jerky shifts lately in my 2018 Audi A5 Sportback, especially at lower speeds and during stop-and-go traffic. It feels like the car hesitates before engaging a gear, and sometimes there's a noticeable clunk.

I've heard that S-Tronic transmissions can have issues with the mechatronic unit. Is this a common problem for the 2018 models? I'm worried about a costly repair.

Has anyone experienced similar symptoms with their Audi A5 or other S-Tronic equipped vehicles? Any advice on what to look for or potential solutions before I take it to the dealer?

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer:

It sounds like you're describing classic symptoms associated with issues in Audi's S-Tronic (DSG) transmission, particularly with the mechatronic unit or clutch packs. This is a known area of concern for some Audi models, including your 2018 A5.

  1. Common Causes:

    • Mechatronic Unit Failure: The mechatronic unit is the brain of the S-Tronic transmission, controlling clutch engagement and gear changes. Internal solenoid failures, pressure sensor issues, or circuit board problems can lead to jerky shifts, hesitation, and even complete transmission failure. This is often the most expensive repair.
    • Clutch Pack Wear: While less common on newer models, excessive wear on the wet clutch packs can also cause similar symptoms, especially if the car has been driven aggressively or has high mileage.
    • Transmission Fluid Issues: Incorrect fluid levels or degraded fluid quality can impact performance, though a complete failure is less likely from this alone.

  2. Diagnostics:

    • A professional scan tool will likely reveal fault codes related to the transmission control module (TCM). Common codes include:
      • P17D8: Torque limitation due to clutch temperature
      • P17BF: Hydraulic pump play protection
      • P1760: Shift lock solenoid circuit
      • P0726: Engine speed input circuit range/performance

  3. When to See a Shop:

    • Immediately: Given the nature of transmission issues, it's crucial to have your vehicle inspected by a qualified Audi specialist or dealership as soon as possible. Continuing to drive with a failing mechatronic unit can lead to further damage to other transmission components.
    • What to Expect: The shop will perform a diagnostic scan, check transmission fluid levels and condition, and may perform a test drive to confirm symptoms. If the mechatronic unit is confirmed to be faulty, replacement or repair is typically required. In some cases, Audi has extended warranties or offered goodwill repairs for specific mechatronic issues, so it's worth inquiring about any applicable TSBs (Technical Service Bulletins) or recalls for your VIN.
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