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2019 Audi S5 B9 Transmission Shifting Hard/Jerky - P17xx Codes?

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Brittany E. · rep 0 · May 22, 4:23 AM · 1 replies · solved · Question

Vehicle: 2019 Audi S5 Sportback Premium Plus

I'm experiencing some concerning transmission issues with my 2019 Audi S5 Sportback, Premium Plus trim. Lately, the shifts have become very harsh and jerky, especially when downshifting at lower speeds or when accelerating from a stop. It feels like it's slamming into gear sometimes.

I haven't seen a check engine light yet, but I'm worried this is a sign of a bigger problem with the S-tronic transmission. I've heard these can have mechatronic unit issues. I'm planning to get it scanned soon.

Has anyone else with a B9 S5 had similar transmission behavior? What kind of diagnostic codes should I be looking for, and what are the typical fixes for this kind of problem?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:23 AM

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ClearTheCode admin answer:

Harsh or jerky shifting on your 2019 Audi S5 Sportback's S-tronic (DL382 or DL501 depending on specific configuration) transmission is definitely a cause for concern and should be addressed promptly. While a check engine light might not be on, there are likely fault codes stored in the Transmission Control Module (TCM).

Here are the common causes and diagnostic steps:

  1. Scan for Transmission-Specific Codes: Use an OBD-II scanner capable of reading transmission codes. Look for codes in the P17xx range, which are specific to the transmission. Common codes related to shifting issues include:
    • P17D8 (Clutch Temperature Monitoring): Indicates issues with clutch overheating or sensor.
    • P1760 (Shift Solenoid Valve): Problems with the solenoids that control gear engagement.
    • P17BF (Hydraulic Pressure Sensor): Issues with the hydraulic system pressure within the mechatronic unit.
    • P17E1, P17E2 (Gear Selector Sensor): Faults with the sensors that detect gear position.
  2. Mechatronic Unit Failure: The mechatronic unit is the control center of the S-tronic transmission, combining the TCM and hydraulic control unit. It's a common failure point, leading to harsh shifts, delayed engagement, or complete transmission failure. Codes like P17BF often point to this.
  3. Transmission Fluid Level and Quality: An incorrect transmission fluid level (too low or too high) or degraded fluid can cause shifting problems. The S-tronic requires specific fluid types and a precise filling procedure, often done with specialized tools.
  4. Software Updates: Sometimes, harsh shifting can be resolved with a software update for the TCM. Audi periodically releases updates to improve shifting logic and address known issues.
  5. Clutch Pack Wear: While less common on a 2019 model unless driven very hard, worn clutch packs can also cause jerky shifts.

When to see a shop:

  • Immediately if you get specific P17xx codes related to the mechatronic unit, solenoids, or clutch temperature.
  • If the issue persists after checking for basic causes (like fluid level, though this is a complex check for S-tronic).
  • If you suspect a mechatronic unit failure, as this is a complex and expensive repair that requires specialized tools and expertise. An authorized Audi service center or a reputable independent Audi specialist can accurately diagnose the issue, perform necessary software updates, or replace the mechatronic unit if required. Continuing to drive with severe transmission issues can lead to further, more costly damage.
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