A whining noise during acceleration from your 2022 Subaru Forester's CVT requires evaluation to determine if it's normal CVT character or indicates developing problems. CVTs sound different than traditional automatics, and some noise can be normal.
Normal CVT Sound Characteristics
CVTs allow the engine to stay at optimal RPM while speed changes, creating a different sound than traditional automatics that shift through gears. This steady-RPM sound can seem unusual to those unfamiliar with CVTs. Some whir or hum during acceleration is inherent.
Abnormal Whining Indicators
Whine that has developed or increased recently. Whine accompanied by performance issues. Whine that varies in pitch independent of speed or RPM. Whine with codes such as P0868 indicating pressure problems. These suggest actual problems rather than normal operation.
Code P0868 Significance
P0868 indicates low transmission fluid pressure. Low pressure means the chain isn't being clamped properly, which can cause slip and the pump may create noise as it tries to build pressure. This code points toward fluid or pump issues.
Possible Causes
Low fluid level is the simplest cause - check and correct first. Pump wear creates noise and insufficient pressure. Internal seal leaks prevent proper pressure buildup. Valve body issues can affect pressure distribution. Bearing wear creates speed-dependent whine.