The same day the head of R&D and two other executives resigned over quality problems, Hyundai Motor Group (China) started recalling some of its imported Rohens [Genesis] cars on 11 November, due to problems with the hydraulic electronic control unit (HECU).

The recall will involve 1,547 vehicles produced between 8 April, 2008 and 16 March, 2012 and sold to the Chinese mainland, the General Administration of Quality Supervision, Inspection and Quarantine said in an online statement cited by China Daily.

The chemical reaction in the HECU of the defective vehicles has affected the proper working of the plunger piston, the statement said.

The manufacturer will offer free checks and replace the brake fluid in the recalled cars.

Hyundai Motor Group (China) is a subsidiary of Hyundai Motor Group.