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2022 S580 Hesitation on Acceleration and Rough Shifts (Low Gears)

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James R. · rep 0 · May 22, 4:13 AM · 1 replies · solved · Question

Vehicle: 2022 Mercedes-Benz S580

Hey everyone,

I'm experiencing some concerning issues with my 2022 Mercedes-Benz S580 (W223) with the V8 biturbo engine and 9-speed automatic transmission. The car has about 25,000 miles on it. Lately, I've noticed a distinct hesitation when I accelerate from a stop or at very low speeds. It's not always smooth, almost like it's struggling to find the right gear or power.

Additionally, the transmission feels a bit rough when shifting in the lower gears (1st to 2nd, 2nd to 3rd). It's not a violent jolt, but definitely not the buttery smooth shifts I expect from an S-Class. There are no warning lights on the dash.

Is this a known issue with the 9G-TRONIC or the 48V system on the S580? What could be causing this, and what should I tell the dealership?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:13 AM

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ClearTheCode admin answer:

The symptoms you're describing with your 2022 S580 – hesitation on acceleration and rough shifts in lower gears – are not typical for a vehicle of this caliber and mileage. While the 9G-TRONIC transmission is generally robust, and the M177 V8 biturbo with EQ Boost is powerful, these issues suggest something is amiss.

Common Causes:

  1. Transmission Software/Adaptation: Modern Mercedes transmissions are highly adaptive. Sometimes, the transmission control unit (TCU) software can develop glitches or the adaptation values can become skewed, leading to suboptimal shifting. A software update or reset of adaptation values can often resolve this.
  2. 48V EQ Boost System: The integrated starter-generator (ISG) in your S580 provides significant torque assist. Any malfunction in the 48V system (battery, ISG, or control unit) could affect power delivery and create a feeling of hesitation.
  3. Engine Management System: Issues with sensors (e.g., mass airflow, oxygen sensors), fuel delivery, or ignition could cause hesitation, though this usually triggers a check engine light.
  4. Transmission Fluid Level/Quality: While less likely at 25,000 miles, incorrect fluid levels or degraded fluid can impact shift quality.
  5. Mechatronic Unit: This is the control unit within the transmission. Faults here can lead to various shifting problems.

Troubleshooting Steps:

  1. Full Diagnostic Scan: A Mercedes-specific diagnostic tool (XENTRY/DAS) can check for any stored fault codes in the engine, transmission, and 48V system control units, even if no dash lights are present.
  2. Check Software Versions: Verify that all relevant control units (engine, transmission, 48V system) have the latest software updates.
  3. Monitor Live Data: A technician can monitor parameters like torque output, gear engagement, and 48V system status during a test drive.

When to See a Shop:

Given that your S580 is a high-end vehicle and still relatively new, it's best to take it to a Mercedes-Benz dealership immediately. They have the specialized diagnostic equipment and factory training to properly diagnose and rectify these complex issues. Clearly describe the symptoms, noting when they occur (e.g., cold vs. warm engine, specific gears). Insist on a thorough diagnostic, including checking for software updates and reviewing transmission adaptation values. Do not delay, as these issues can sometimes worsen over time.

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