A steering wheel that's hard to turn on your 2021 Honda Civic indicates loss of electric power steering assist. Modern vehicles rely heavily on this assist—without it, steering requires significant physical effort, particularly at low speeds or when parking.
Understanding Power Steering Assist
The Civic's electric power steering system reduces the effort needed to turn the steering wheel by using an electric motor to assist your input. At low speeds and during parking, assist is maximum. At highway speeds, assist decreases for better road feel. Without this assist, steering effort increases dramatically.
Electric Motor Failure
The EPS motor can fail partially or completely. Partial failure may create inconsistent assist—sometimes heavy, sometimes normal. Complete failure eliminates assist entirely. Motor failures can result from internal wear, electrical faults, or overheating from continuous heavy use.
Fuse and Electrical Issues
The EPS system has dedicated fuses that can blow, cutting power to the motor. Wiring issues, poor connections, or voltage problems can also affect motor operation. These electrical issues may be intermittent before becoming permanent.
Sensor Failures
The torque sensor measures how much force you're applying to the steering wheel, telling the motor how much to assist. A failed torque sensor prevents the system from knowing you're steering, resulting in no assist. Steering angle sensors can also affect system operation.
EPS Control Module
The electronic control module manages the EPS system. Module failures can disable the entire system or cause erratic assist. Module problems may set diagnostic codes that illuminate warning lights.
Code P0621 and Charging System
Code P0621 relates to generator/alternator issues that can affect EPS. Insufficient electrical power from a failing alternator can cause EPS faults, as the system requires adequate voltage to function. Address charging system issues to restore EPS operation.