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2020 Audi A4 S-Tronic Transmission Jerking and Hesitation

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Kim L. · rep 0 · May 22, 4:32 AM · 1 replies · solved · Question

Vehicle: 2020 Audi A4 2.0T Quattro

Hi everyone, I'm looking for some insights on my 2020 Audi A4 2.0T Quattro with the S-Tronic transmission. Lately, I've noticed some really rough and jerky shifts, especially when downshifting at lower speeds or accelerating from a stop. It feels like the car hesitates for a moment before engaging, and then lurches forward.

It's not constant, but it's happening more frequently, and it's making city driving pretty uncomfortable. I've heard some things about Audi's DSG/S-Tronic transmissions, but I thought the newer models had these issues ironed out. My car has about 45,000 miles on it.

Could this be a sign of a bigger problem with the transmission, or is there something simpler like a software adaptation that needs to be done? I'm worried about potential costly repairs. Any advice or shared experiences would be really helpful before I take it in. Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:32 AM

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ClearTheCode admin answer:

Jerky shifts and hesitation in Audi's S-Tronic (DSG) transmissions, particularly in the 2016-2022 model years, can be concerning but are often diagnosable.

  1. Mechatronic Unit Issues: The mechatronic unit is the 'brain' of the S-Tronic transmission, controlling clutch engagement and gear changes. Faults here are a common cause of rough shifting.

    • Action: A diagnostic scan using an Audi-specific tool (like VCDS or ODIS) is crucial. Look for fault codes related to the transmission control module (TCM) or specific solenoid valves within the mechatronic unit. Common codes might include P17D8 (Clutch temperature monitoring), P17BF (Hydraulic pump play protection), or P0726 (Engine speed input circuit range/performance).

  2. Transmission Fluid and Filter Service: While Audi often states 'lifetime' fluid, many specialists recommend a DSG fluid and filter change every 40,000-60,000 miles, especially if you experience shifting issues. Old or contaminated fluid can impact clutch operation and hydraulic pressure.

    • Action: Check your service records. If the DSG service hasn't been done, it's a good preventative measure and potential fix. Ensure genuine Audi fluid and filter are used.

  3. Clutch Pack Wear: Over time, the wet clutch packs can wear, leading to slippage or harsh engagement.

    • Action: This is typically diagnosed after ruling out mechatronic and fluid issues. A technician can monitor clutch slip values during a test drive with diagnostic equipment.

  4. Software Adaptation/Update: Sometimes, the transmission control module (TCM) simply needs a software update or a basic settings adaptation to relearn shift points.

    • Action: An Audi dealer or specialist can perform these adaptations.

When to See a Shop: If the issue is persistent, worsening, or accompanied by a 'Check Engine' light or transmission warning, take your A4 to an Audi dealership or a reputable independent Audi specialist immediately. Ignoring transmission problems can lead to more severe and costly damage.

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