Heavy steering at low speeds in your 2021 Subaru Outback, particularly during parking maneuvers, indicates reduced electric power steering assist. Since EPS provides maximum assist at low speeds, heavy steering in these conditions points to system issues requiring diagnosis.
Normal EPS Behavior
Electric power steering provides speed-sensitive assist—maximum help at low speeds when resistance is highest, reduced assist at highway speeds for better road feel. Heavy low-speed steering indicates this maximum assist isn't being delivered.
Partial System Failure
EPS can fail partially, providing some assist but not full capability. This creates noticeably heavy steering while still being usable. Partial failures may result from sensor issues, motor degradation, or control module problems.
EPS Motor Issues
The electric motor providing assist can weaken from wear, overheating, or internal faults. A degraded motor delivers less assist even when the system is otherwise functioning. Motors don't always fail completely—gradual decline is common.
Sensor Malfunctions
The torque sensor detects how much effort you're applying, telling the system how much to help. A malfunctioning torque sensor may underreport effort, causing inadequate assist. Similarly, vehicle speed sensor issues can affect how much assist is provided.
Electrical Supply
Insufficient voltage to the EPS system reduces motor power and assist. Battery condition, alternator output, and connection integrity all affect available power. Check the electrical system if steering feels weak.
Code C0073 Analysis
Code C0073 relates to vehicle speed signal issues that can affect EPS operation. The system uses speed to determine assist level—incorrect speed data affects assist calibration. This code may cause incorrect low-speed assist.