2018 S5 Sportback S-tronic hesitation and jerking at low speeds

ClearTheCode admin answer:

This type of hesitation and jerking in an S-tronic (DSG) transmission is a common concern and can stem from several issues. Given your 2018 S5 Sportback, here’s a breakdown of potential causes and steps:

1. S-tronic Clutch Pack Wear: Over time, the clutch packs in the dual-clutch transmission can wear, leading to less precise engagement and jerking. This is more common in vehicles with higher mileage or those that have been driven aggressively in stop-and-go traffic.
2. Mechatronic Unit Issues: The mechatronic unit is the brain of the S-tronic, controlling clutch engagement and gear selection. Malfunctions within this unit (e.g., faulty solenoids, pressure issues) can cause erratic shifting. You might see codes like P0700 (Transmission Control System Malfunction) or P17D8 (Clutch Temperature Monitoring) if there's a mechatronic issue, though not always immediately.
3. Transmission Fluid Level/Quality: Incorrect fluid levels or degraded fluid can impact transmission performance. While less common on newer vehicles, it's worth checking if the fluid has ever been serviced or if there are any leaks.
4. Software Glitches: Sometimes, a simple software update for the transmission control module (TCM) can resolve minor shifting anomalies.

When to see a shop:

• Immediately: If the jerking becomes severe, you hear grinding noises, or any transmission warning lights appear on your dashboard (e.g., EPC, transmission malfunction light).
• Soon: If the issue persists and is consistently affecting your driving experience. An Audi specialist or dealership can perform a diagnostic scan using specialized tools (like VCDS or ODIS) to check for fault codes in the TCM, analyze live data, and assess clutch wear values. They can also check for any available software updates. Addressing this early can prevent more significant and costly transmission repairs down the line.