12-EM-007

GROUP
NUMBER
Hyun a R 11
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Technical Service Bulletin
SUBJECT:
DATE
NOVEMBER 2012
MODEL(S)
MULTIPLE
RATTLE I BUZZING SOUND DURING INITIAL COLD START OR
WHEN ACCELERATING FROM LOW ENGINE RPM
This bulletin supersedes TSB 10-EM-005 to include updated Applicable Vehicles listing.
Description: Some drivers of the affected vehicles (listed below) equipped with the 2.0L
Tu rbocharger engine may notice a slight engine rattle or buzzing sound during certain operating
co ndition s. The sound may sound sim ilar to a loose exhaust heat shield .
Th is sou nd may be noticed :
• When the engine is started after a long cool down period with coolant temperature less than
86°F (30°C). Initial start up rattle/buzzing may last for 25 seconds or longer.
• During acceleration with engine speed between 1,500 - 2,500 RPM .
Applicable Vehicles:
• 2011 MY and later (YF) Sonata 2.0L Turbo
• 2013 MY and later (BK) Genesis Coupe 2.0L Turbo
• 2013 MY and later (AN) Santa Fe Sport 2.0L Turbo
Additional Information:
During normal engine operation , natural engine vibrations are transmitted to the turbocharger waste
gate actuator rod , the pivot point, and the waste gate valve. The rattle or buzzing sound that may
occur results from the required tolerances in the waste gate pivot point and the waste gate valve .
These to lerances are necessary to allow operation under the extreme operating temperatures
experienced by the turbocharger.
Service Action:
No repair shou ld be attempted fo r this rattlin g or buzzing cond ition . Th is normal operating
characteristic wi ll not affect th e performance or du rability of th e veh icle .
Circu late To: General Manager, Service Manager, Parts Manager, Warranty Manager, Service
Advisors , Technicians , Body Shop Manager, Fleet Repair