The component can become internally contaminated, resulting in an electrical short. Failure can then cause the engine to stall, increasing the risk of a crash. The problem can also disable trailer brakes on certain models.
The campaign affects a long list of models including the 2013-2014 Cadillac CTS, Escalade and Escalade ESV; Chevrolet Suburban and Tahoe; and GMC Yukon and Yukon XL. Models limited to the 2014 model year include the Buick Enclave; Chevrolet Express, Impala, Silverado HD and Traverse; and the GMC Acadia, Savana and Sierra HD.
The issue has been blamed on a manufacturing deficiency during CEM assembly by supplier Continental. The automaker identified at least 532 warranty claims related to the defect, which involves parts manufactured during a two-month period from mid-June to mid-August 2013.
GM has not yet announced a schedule for installing new CEMs in affected vehicles.
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