The "Service Power Steering" message on your 2023 Chevrolet Equinox indicates a fault in the electric power steering (EPS) system. Unlike traditional hydraulic systems, the Equinox uses an electric motor to provide steering assist, and this warning means that assist may be reduced or lost.
Electric Power Steering System
The Equinox's EPS system uses an electric motor mounted on the steering column or rack to provide power assist. Sensors monitor steering wheel position, vehicle speed, and torque input to determine how much assist to provide. The steering control module processes this information and commands the motor.
What the Warning Means
When the "Service Power Steering" message appears, the system has detected a fault. Steering assist may be reduced, intermittent, or completely lost. The steering still works mechanically—you can turn the wheel—but it requires significantly more effort without power assist.
Common Causes
EPS faults often originate from the torque sensor on the steering column, which measures driver input. Motor failures, wiring issues, and steering control module problems also trigger warnings. Battery voltage problems (weak battery, failing alternator) can affect EPS operation since it's electrically powered.
Battery Connection Issues
A surprisingly common cause is poor battery connections or low battery voltage. EPS systems require consistent voltage to operate. Corroded battery terminals, a weak battery, or alternator issues can trigger EPS warnings. This is worth checking before assuming major EPS component failure.
Steering Angle Sensor
The steering angle sensor tells the system the steering wheel position. If this sensor fails or loses calibration, EPS faults result. Sensor issues can be intermittent, causing warnings that come and go. Recalibration or replacement may be required.
Response to Warning
If power steering assist is lost, the vehicle is still controllable but steering requires much more effort, especially at low speeds and when parking. Drive carefully to a service facility. If the warning is intermittent and assist seems normal, diagnosis is still warranted to prevent complete failure.