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ABS and ESP Lights On - 2017 S550 - Help!

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Heather Y. · rep 0 · May 22, 4:14 AM · 1 replies · solved · Question

Vehicle: 2017 Mercedes-Benz S550 (W222)

Hello everyone,

My 2017 Mercedes-Benz S550 (W222) just threw both the ABS and ESP warning lights on the dash. They came on simultaneously while I was driving normally. I haven't noticed any immediate issues with braking, but I know these systems are critical for safety and stability. The car feels a bit different, but it's hard to pinpoint exactly how.

What should I check first? Is there a common sensor issue for these S-Class models that triggers both lights? I'm hoping it's something relatively simple, but I'm prepared for more complex diagnostics. Any insights or common OBD codes would be really helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:14 AM

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ClearTheCode admin answer:

When both the ABS (Anti-lock Braking System) and ESP (Electronic Stability Program) warning lights illuminate on your 2017 S550, it indicates a fault within the vehicle's dynamic stability control systems. These systems are interconnected, so a fault in one often affects the other. While your braking might feel normal, the safety features provided by ABS and ESP are likely disabled or severely limited.

Here are the most common causes and steps for diagnosis:

  1. Wheel Speed Sensors: This is by far the most frequent cause. Each wheel has a sensor that monitors its rotational speed. If one sensor fails or becomes contaminated with debris, the ABS/ESP module loses crucial data, triggering the lights. Common OBD codes for this issue include C0031 (Left Front Wheel Speed Sensor), C0032 (Right Front Wheel Speed Sensor), C0033 (Left Rear Wheel Speed Sensor), C0034 (Right Rear Wheel Speed Sensor), and C0035 (Wheel Speed Sensor Circuit Malfunction).
  2. ABS/ESP Module Failure: The control module itself can fail, either electronically or due to internal component issues. This is a more expensive repair but less common than a sensor issue.
  3. Brake Light Switch: A faulty brake light switch can sometimes confuse the ESP system, as it relies on brake pedal input. While less common for both lights, it's a possibility.
  4. Steering Angle Sensor: The ESP system uses the steering angle sensor to determine the driver's intended direction. A fault here can trigger the ESP light, which in turn can affect ABS.
  5. Low Brake Fluid Level: While usually triggering a separate brake warning light, an extremely low fluid level can sometimes impact system pressure and trigger these lights.
  6. Wiring Issues: Damaged wiring or connectors to any of the above components can also cause intermittent or permanent faults.

When to see a shop:

It is critical to have your S550 diagnosed by a qualified Mercedes-Benz technician immediately. Driving with disabled ABS and ESP systems compromises your vehicle's ability to prevent skidding and maintain control during emergency braking or evasive maneuvers. A professional shop will use a diagnostic scanner (like XENTRY/DAS) to read the specific fault codes stored in the ABS/ESP module, which will pinpoint the exact cause of the problem. Do not delay this repair, as your safety systems are currently compromised.

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