The issue apparently revolves around the electronic parking brake, which may not properly disengage. As a result, the rear brake pads could rub the rotor even while the vehicle is in motion, causing "significant heat, smoke and sparks." The earlier investigation had been launched following a complaint regarding the forward collision avoidance system, which is now either appears to have been unrelated or possibly a symptom of this larger issue.
The recall affects 2013-15 XTS models manufactured between February 14, 2012, and August 22, 2014, as well as 2014-15 Impalas manufactured between January 15, 2013, and August 22, 2014. The total number of affected vehicles reported by the National Highway Traffic Safety Administration comes to precisely 132,921 units, while The Detroit News reports a higher total of 205,000 units - the difference potentially coming down to the scope within the US and more broadly across North America. Dealers will contact owners to update the software in order to fix the problem.
Report Receipt Date: SEP 09, 2014
NHTSA Campaign Number: 14V541000
Potential Number of Units Affected: 132,921
Manufacturer: General Motors LLC
General Motors LLC (GM) is recalling certain model year 2013-2015 Cadillac XTS vehicles manufactured February 14, 2012, to August 22, 2014, and 2014-2015 Chevrolet Impala vehicles manufactured January 15, 2013, to August 22, 2014. In the affected vehicles, the electronic parking brake piston actuation arm may not fully retract causing the brake pads to stay partially engaged.
Brake pads that remain partially engaged with the rotors may cause excessive brake heat that may result in a fire.
GM will notify owners, and dealers will update the electronic parking brake software, free of charge. The recall is expected to begin in September 2014. Owners may contact Chevrolet customer service at 1-800-222-1020, or Cadillac customer service at 1-800-458-8006. GM's number for this recall is 14471.
Owners may also contact the National Highway Traffic Safety Administration Vehicle Safety Hotline at 1-888-327-4236 (TTY 1-800-424-9153), or go to www.safercar.gov.