After receiving complaints of decreased brake effectiveness in certain 2009-2012 Genesis Sedans, Hyundai has identified the problem as corrosion in the Hydraulic Electronic Control Unit (HECU) module.

The subject vehicles may have been filled with a brake fluid with insufficient corrosion inhibitors. Over time, the problem could lead to a gel buildup on the HECU module’s valves resulting in a soft brake pedal and reduced braking effectiveness. Increased stopping distances can substantially increase the risk of an accident.

In March 2013, Hyundai launched a service campaign to replace the fluids in certain 2009-2012 Genesis sedans and 2011-2012 Equus vehicles. Upon reviewing the service campaign response data, they found that vehicles built prior to June 01, 2010 may require additional inspection or replacement of the HECU. Hyundai will be asking these owners to bring in their vehicles to have the HECU inspected and replaced as necessary. (NHTSA Campaign Number: 13V-489) Approximately 43,500 could be affected by this problem.