Vehicles with a 7 speed automatic transmission may experience a harsh downshift from 4th to 3rd gear on deceleration. Our technicians tell us revised control module software is available to correct this concern. On higher mileage vehicles other faults may cause transmission shifting issues. Whenever a transmission repair is performed, the control module should be checked for the latest software and updated if necessary.Google+
Car Problem Reports
Infiniti G37 Vehicles With an Automatic Transmission May Experience a Harsh Downshift From 4th to 3rd Gear
Infiniti G37 Problem
Drive Train Affected: Automatic Transmission
Average Mileage: 49,333 mi (15,000 mi - 78,000 mi)
Visitor, 2010 Infiniti G37, Automatic Transmission, 15,000 mi
7 speed AT paddle shift G37S sedan. Car in shop with complete transmission failure. Paddle shifted to 4th decelerating on highway in the process of changing lanes to a slower lane. Stepped on the gas pedal and the best way to describe it is "dead" pedal feel. Could not accelerate above 60 mph. Manual shifting or using paddle shift to shift up/down did absolutely nothing.. car would not shift at all. Exited off highway, put it neutral on off ramp and came to stop. Prayed that car would not stall after putting back into "D" thankfully it did not. Down side only had 1st, 2nd, and 3rd gears. Called Infiniti dealer and traversed through city traffic and dropped car off. Got a call later in the day.. complete automatic transmission valve assembly needs replacement.
Prior to this failure, car surged on up shifts and delayed with incredibly high revs on downshifts whether using paddle shift in D or M.