NHTSA Complaint #11633118 — 2005 CHEVROLET IMPALA

The contact owns a 2005 Chevrolet Impala. The contact stated while driving at an undisclosed speed, the instrument panel became inoperable. The contact stated that several unknown warning lights were illuminated. The contact stated that while driving at an undisclosed speed, the vehicle unexpectedly downshifted. There was no warning light illuminated. The vehicle was taken to an independent mechanic but was not diagnosed or repaired. The dealer was not contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 200,000.