Acura CMBS Radar Recall on MDX, RLX

Acura will voluntarily recall approximately 19,500 model-year 2014-2015 MDX and RLX vehicles equipped with the Collision Mitigation Braking System (CMBS) in the United States to update system software, free of charge. The CMBS may incorrectly determine that there is the potential for a forward collision if a vehicle detected ahead is traveling near a metallic structure, such as a metal guard rail or fence; this could lead the CMBS to apply the vehicle brakes unexpectedly, increasing the risk of a crash with following traffic. No crashes or injuries have been reported related to this issue in the United States, but one crash was reported in Japan related to this issue.

The CMBS in the affected vehicles utilizes millimeter wave radar to scan traffic conditions ahead of the vehicle. When the system detects a vehicle or object ahead and determines a collision with the detected object is imminent, CMBS applies emergency autonomous braking to help reduce vehicle speed and eventual collision forces, and therefore to help reduce the severity of a collision if drivers don’t take corrective action on their own.

Acura is announcing this recall to encourage all owners who purchased an affected vehicle to take it to an authorized dealer as soon as they receive notification of this recall from Acura. Mailed notification to customers will begin in June. In addition, owners of these vehicles can determine if their vehicles require repair by going to or by calling (800) 382- 2238 and selecting option 4.

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