Table 1 shows one common vehicle speed control related problems of the 2015 Subaru Impreza Wrx.
| Problem Category | Number of Problems |
|---|---|
| Vehicle Speed Control problems |
A cvt defect is causing erratic, uncontrollable, and violent changes in engine rpm, including but not limited rapid violent oscillations in rpm, non-shifting, sustained holding of rpm near engine red-line, abrupt decreases of rpm and subsequent loss of power despite the accelerator is still being applied. These defects have occurred under an array of driving conditions, speeds, throttle positions, road gradients, ambient temperatures, altitudes, and engine temperatures. Subaru was provided with videos of the dashboard gauges taken during malfunctions, and the vehicle was returned to them to have the issues assessed at least 3 times. Subaru completed tcm "re-flashing", ecm updates, and software updates to address the problems with no effect. Cvt malfunctions have gradually increased in severity and frequency over the past 20,000 miles. The repeated, sudden, and violent malfunctions of the cvt have put the occupants at risk of collision on multiple occasions and in one instance an abrupt downshift caused a minor neck injury to a disabled passenger.
2015 wrx 2. 0l manual transmission while driving the car in everyday situations I have had (3) distinct problems associated with the engine/throttle/idle. 1) ghost blip: when coming to a stop, around 5-15 mph, put it in neutral coast to a stop idle will inexplicably spike from ~700rpm (idle) --> ~1. 2-1. 5k rpm (for a second or two. . . Like a ghost blipped the throttle). No pressure applied to accelerator. 2) rough idle: while sitting at a stop, in neutral, ~700rpm (idle) --> will dip to ~650-600rpm for a fraction of second & reoccur every 2-4 seconds. Feels like someone lightly shaking your seat from left to right. 3) near stall: while sitting at a stop, in neutral, ~700rpm (idle) --> will dip the rpms low enough that the whole car noticeably shakes. . . Similar to the shake you would experience if the engine were actually about to stall. The rpms will fumble around a bit and then hiccup back to normal idle after 4-5 seconds. All three items have been brought to the attention of the local Subaru dealer on (2) occasions w/ the reply unable to diagnose problem and/or it is normal.