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2023 MDX Type S Lane Keep Assist and ACC Malfunctions

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Mark S. · rep 0 · May 26, 3:55 AM · 1 replies · solved · Question

Vehicle: 2023 Acura MDX Type S

I'm having issues with the advanced safety features on my 2023 Acura MDX Type S. Specifically, the Lane Keep Assist System (LKAS) frequently gives a "System Malfunction" error and disengages, even on clear roads. The Adaptive Cruise Control (ACC) also sometimes randomly disengages or fails to detect vehicles ahead, which is quite concerning.

These features were a big reason I bought the Type S, and they're not working reliably. There are no obvious obstructions on the windshield camera or front radar. Has anyone else experienced these intermittent issues with their newer MDX models? What could be the cause?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:55 AM

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ClearTheCode admin answer:

  1. Sensor Obstruction/Cleanliness: Even if not obvious, ensure the front radar sensor (usually in the lower grille) and the windshield-mounted camera (behind the rearview mirror) are impeccably clean. Dirt, ice, or even a small bug can interfere with their operation.
  2. Software Calibration: Advanced driver-assistance systems (ADAS) rely heavily on precise sensor calibration. Even a minor bump or windshield replacement can throw off calibration. Software glitches can also cause intermittent malfunctions.
  3. Battery Health: Sometimes, an aging or weak 12V battery can cause various electronic systems to act erratically, including ADAS features, due to insufficient voltage. It's a long shot but worth checking.
  4. Causes:
    • Dirty or obstructed sensors/camera.
    • Misaligned or uncalibrated sensors (post-collision or windshield replacement).
    • Software bugs or firmware issues in the ADAS control module.
    • Faulty radar unit or camera unit.
    • Wiring harness issues.
  5. When to See a Shop: Given the safety-critical nature of these systems, if cleaning the sensors doesn't resolve the issue, you should schedule an appointment with your Acura dealership immediately. They have specialized diagnostic equipment to read specific ADAS fault codes (which often don't trigger a standard check engine light but will be stored in the ADAS module). They can perform advanced sensor calibration, check for software updates, and diagnose any hardware failures with the radar or camera units. Do not rely on malfunctioning safety features.
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