Preliminary Evaluation · Closed
VEHICLE STALL/LOSS MOTIVE POWER
Manufacturer: Volkswagen Group of America, Inc.
This investigation led to a recall
NHTSA links this probe to recall campaign 09V333000.
Read the recall: what is defective and the free fix →What NHTSA is examining
The subject vehicles are equipped with direct shift gearbox (dsg) transmissions, which feature a 6-speed automatic gearbox with two wet running clutches (dual clutch) in which the clutch mechanism and gear changes are electrohydraulically operated by a mechatronic control unit.the dsg mechatronic controller includes extensive self diagnostic functions and strategies to ensure safe operation and prevent system/component damage in the event of component failures or harsh operating conditions.the basic hierarchy of fault modes includes some that only result in the storage of a diagnostic trouble code (dtc) and cause no loss of function, some that store a dtc and reduce vehicle operation to a limp home mode, and some that store a dtc and cause an interruption of motive power (I.e., open clutch).the driver is alerted to the latter two modes by the dash gear position indicator (prnds) flashing. One of the conditions that results in interruption of motive power is excess gearbox temperature.the system initially responds to increased gearbox temperature by ramping down engine torque.if the temperature keeps rising the mechatronic unit responds by opening the clutch.in a defect information report submitted to nhtsa on august 20, 2009, volkswagen described a potential defect in the wiring harnesses of the dsg gearbox temperature sensors used in approximately 16,000 model year (my) 2009 and 2010 volkswagen (eos, jetta and gti) and audi (a3 and tt/tt roadster) vehicles equipped with dsg…
Vehicles under investigation
Source: NHTSA Office of Defects Investigation records, updated daily. An investigation is not a determination that a defect exists; many probes close without a recall.