Cadillac LYRIQ Brake Issues Investigated

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The Office of Defects Investigation (ODI), a branch of the National Highway Traffic Safety Administration (NHTSA), is currently examining reports concerning the 2023 Cadillac LYRIQ models. These vehicles have been reported to exhibit a loss of brake boost assist, potentially impairing braking functionality. The investigation, known as Preliminary Evaluation PE24011, was initiated after multiple complaints were filed with the ODI.

Key Highlights of the Investigation

• Multiple Reports: Early Warning Reporting field reports indicate issues with a hard brake pedal and a “Brake System Failure” message.
• Component Involved: The problem has been traced back to an internal spindle in the electronic brake control module (eBoost) which may fracture.
• Effects of Fracture: A fractured spindle could lead to diminished brake assist, limited vehicle speed, and reduced ABS functionality.
• Manufacturer’s Response: General Motors has acknowledged the issue and implemented a new material clean break point in May 2023. They also introduced an over-the-air (OTA) software update to diagnose potential failures early.
• Current Status: The ODI is conducting a Preliminary Evaluation to ascertain the extent and severity of the reported defects.

General Motors has confirmed the failure mechanism within the eBoost system, specifically during an Anti-Lock Braking System (ABS) event where the internal spindle is prone to breaking. “Due to the fracture, the vehicles can lose brake assist, experience speed limitation, and ABS would lose some functionality,” a GM representative explained.

In an effort to address these issues proactively, GM has not only altered the material used in the spindle but also developed a software update. This update, applied via OTA, performs a diagnostic cycle at every vehicle start-up to check the integrity of the brake booster. If any issue is detected, the system triggers a warning light prompting the vehicle owner to visit a dealership. Importantly, this intervention allows for early detection and repair under warranty, though it is not categorized as a recall.

As the ODI proceeds with its investigation, the goal is to thoroughly understand the problem’s scope and its implications for safety. This will help determine whether further action is needed to ensure the safety of affected vehicle owners and the general public.