A whining noise from your 2022 Infiniti QX60's transmission on the highway can be concerning. Note that the 2022 QX60 actually uses a 9-speed automatic transmission rather than a CVT, but transmission whining in either type indicates potential issues.
What Causes Transmission Whine
Bearing wear creates continuous whine that varies with speed. Gear mesh noise from worn teeth. Pump noise from internal wear or cavitation. Low fluid can cause pump noise. The pitch and volume of the whine often indicates which component is involved.
Code P0868 Low Pressure
P0868 indicates transmission fluid pressure is low. In automatic transmissions, low pressure can cause pump cavitation that creates whining, plus shifting issues as clutches can't apply properly. This code points toward fluid or pump problems.
Highway Speed Specifics
Whine at highway speed often indicates final drive bearings or torque converter issues, as these operate at their highest speeds during highway cruising. Speed-dependent noise that changes with vehicle speed (not engine RPM) points toward the final drive area.
Diagnosis Approach
Determine if noise varies with vehicle speed or engine RPM - this identifies rotating component. Check fluid level and condition. Listen for noise changes during deceleration versus acceleration. Professional diagnosis may include stethoscope testing to pinpoint the noise source.