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SH-AWD System Warning Light on my 2018 RLX Sport Hybrid

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Mike T. · rep 0 · May 26, 3:57 AM · 1 replies · solved · Question

Vehicle: 2018 Acura RLX Sport Hybrid

Hello fellow RLX owners,

I'm experiencing an intermittent 'SH-AWD System Malfunction' warning light on the dash of my 2018 Acura RLX Sport Hybrid. It usually comes on after driving for about 15-20 minutes, and sometimes it clears itself after restarting the car, but it always comes back.

I haven't noticed any immediate changes in driving feel or handling, but I'm concerned about the system not working correctly. Has anyone dealt with this specific warning? What was the cause and solution?

I'm planning to take it in, but I'd love to hear if this is a common issue or something unique.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:57 AM

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ClearTheCode admin answer:

An intermittent 'SH-AWD System Malfunction' warning on your 2018 Acura RLX Sport Hybrid indicates an issue within the Super Handling All-Wheel Drive system, which is a complex and integral part of the vehicle's performance and safety. Here are common causes:

  1. Wheel Speed Sensors: These sensors provide data to the SH-AWD system. A faulty or dirty sensor on one of the wheels can send incorrect signals, triggering the warning. This is a relatively common and often straightforward fix.
  2. Yaw Rate Sensor/G-Sensor: These sensors help the SH-AWD system understand the vehicle's rotational movement and lateral acceleration. If one is malfunctioning, the system may not operate correctly.
  3. SH-AWD Control Unit: The dedicated control unit for the SH-AWD system could have a software glitch or a hardware fault. This might require a software update or, in rare cases, replacement of the module.
  4. Wiring Issues: Damaged or corroded wiring to any of the SH-AWD components can interrupt communication and trigger a fault.
  5. Fluid Level/Condition: While less common for a warning light, ensuring the rear differential fluid (which powers the SH-AWD unit) is at the correct level and in good condition is always a good practice.

Diagnostics: When the warning light is active, the system typically stores diagnostic trouble codes (DTCs) in the SH-AWD control unit. These codes (e.g., C1800 series codes) are crucial for pinpointing the exact problem. A standard OBD-II scanner might not be able to read these specific manufacturer codes; a more advanced scanner or dealership tool is usually required.

When to see a shop: You should schedule a diagnostic appointment with an Acura dealership or a specialized shop as soon as possible. While you might not feel an immediate difference, the SH-AWD system is critical for optimal handling and stability, especially in adverse conditions. Driving with the warning light on means the system may not be fully functional, potentially compromising the vehicle's intended dynamics.

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