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2020 NSX SH-AWD System Warning and Stiff Ride

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Mike T. · rep 0 · May 26, 3:59 AM · 1 replies · solved · Question

Vehicle: 2020 Acura NSX

I've been driving my 2020 Acura NSX for a while now, and recently, the 'SH-AWD System Malfunction' light came on. Simultaneously, the ride quality has become noticeably stiffer, almost harsh, even in comfort mode. It feels like the active dampers aren't working correctly.

Has anyone with a 2016-2026 NSX experienced this combination of issues? Could the SH-AWD warning be related to the suspension stiffness? I'm trying to figure out if it's a sensor issue or something more serious with the AWD or active suspension systems.

Any insights or similar experiences would be very helpful!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:59 AM

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ClearTheCode admin answer:

An 'SH-AWD System Malfunction' warning combined with a stiff ride in your 2020 Acura NSX strongly suggests an issue with the integrated chassis control systems. The NSX's Super Handling All-Wheel Drive (SH-AWD) and active damper system work in concert, so a fault in one can affect the other, or they could share a common sensor or control module problem.

Here's what to investigate:

  1. Diagnostic Scan: A professional scan is essential to pinpoint the exact fault. Look for codes related to:
    • C1800: SH-AWD System Malfunction (general SH-AWD fault).
    • C1810: Active Damper System Malfunction (specific to the suspension).
    • Codes related to wheel speed sensors, yaw rate sensors, steering angle sensors, or G-force sensors, which are critical inputs for both systems.
  2. Check for Physical Damage: Visually inspect the suspension components for any obvious damage, leaks from the active dampers, or disconnected wiring/sensors.
  3. System Interdependence: The SH-AWD system relies on various sensors to determine optimal torque distribution, and the active dampers adjust ride stiffness based on driving conditions and selected mode. A fault in a shared sensor or the central vehicle dynamics control module could trigger both symptoms.
  4. Causes: Potential causes include a faulty wheel speed sensor, a problem with one of the active damper units, a malfunction in the SH-AWD control unit, or even a wiring harness issue.
  5. When to See a Shop: Due to the complexity and safety implications of both the SH-AWD and active suspension systems, it is critical to have your 2020 NSX diagnosed by an Acura dealership. They have the specialized diagnostic equipment to accurately identify the root cause and perform the necessary repairs to restore proper handling and safety.
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