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2023 Yukon Denali Adaptive Cruise & Lane Keep Assist Unavailable

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Melissa G. · rep 0 · May 22, 3:42 AM · 1 replies · solved · Question

Vehicle: 2023 GMC Yukon Denali Ultimate

Hey everyone,

I'm experiencing an intermittent issue with the advanced driver-assist systems on my 2023 GMC Yukon Denali Ultimate. Specifically, the Adaptive Cruise Control (ACC) and Lane Keep Assist (LKA) frequently show an "unavailable" message on the dash.

This happens seemingly at random, even in clear weather conditions with no visible obstructions on the road or sensors. Sometimes, after restarting the vehicle, they'll work again for a while, but then the message pops back up. It's frustrating because these are features I rely on.

Has anyone else with a newer Yukon or other GMC vehicle had similar problems? Could it be a sensor issue, a software glitch, or something else entirely? I'm trying to gather some info before I take it to the dealer.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 3:42 AM

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ClearTheCode admin answer:

Intermittent unavailability of Adaptive Cruise Control (ACC) and Lane Keep Assist (LKA) on your 2023 GMC Yukon Denali Ultimate points to a potential issue with the vehicle's advanced driver-assistance systems (ADAS). These systems rely on a network of sensors (radar, cameras, ultrasonic) and complex software to function correctly.

Here are the common steps and potential causes:

  1. Sensor Obstruction/Damage: Even if you perceive clear weather, the front radar sensor (usually located behind the lower grille or emblem) or the windshield-mounted camera (for LKA) could be temporarily obstructed by dirt, ice, or even a minor impact. Inspect these areas for any physical damage or persistent debris. A misaligned sensor, even slightly, can also cause issues.
  2. Software Glitch/Calibration: ADAS systems are heavily software-dependent. A temporary software glitch can cause these systems to become unavailable. Sometimes, a full system recalibration is needed, especially if the vehicle has had any front-end work or windshield replacement. Ensure your vehicle's software is up to date.
  3. Wiring or Connector Issues: Loose, corroded, or damaged wiring to the front radar sensor, camera, or related control modules can cause intermittent communication failures. These systems are sensitive to voltage fluctuations and signal integrity.
  4. Control Module Fault: A fault within the dedicated ADAS control module, the Engine Control Module (ECM), or Body Control Module (BCM) that communicates with these systems can lead to their unavailability. An OBD-II scan is crucial here.
  5. OBD-II Diagnostics: Connect an OBD-II scanner to check for specific diagnostic trouble codes (DTCs). Codes like U0235 (Lost Communication With Cruise Control Front Distance Sensor Module) or C0561 (System Disabled - Electronic Brake Control Module) are common indicators of issues with these systems. Other codes might point to specific sensor failures or communication errors.

When to See a Shop: Given the complexity and safety-critical nature of ADAS, it's highly recommended to take your Yukon to a GMC dealership or a specialist shop equipped with advanced diagnostic tools. They can perform a thorough scan for specific ADAS-related codes, check sensor calibration, and diagnose any underlying module or wiring issues that are causing the intermittent unavailability. Do not ignore these warnings, as they relate directly to vehicle safety features.

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