NHTSA Complaint #11683803 — 2014 NISSAN 370Z

While driving my 2014 Nissan 370Z with only around 43,000 miles, the car suddenly made a loud bang in the rear area and then would not shift normally in automatic mode while I was on the highway with my child in the car. When I inspected the underside afterward, there were no fluids leaking and I had not hit anything that could have caused the noise or malfunction of the output sensor. Shortly after, the vehicle went into limp mode and would not shift past 2nd or possibly 3rd gear. Manual mode also stopped working. This limited the car to around 25 mph, creating a dangerous situation in traffic since it could not accelerate normally. The check engine light came on, and a scan revealed a P0720 Speed Sensor Circuit failure. The dealer advised replacing the valve body assembly at a cost of nearly $5,000. A transmission electronics failure of this kind at such low mileage is not normal wear and tear. Research shows that other Nissan and Infiniti owners with the same 7-speed automatic transmission have experienced the same problem. This appears to be a recurring defect that presents a serious safety risk when the vehicle suddenly loses acceleration ability.