Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Description And Operation
The Electric Power Steering (EPS) module is mounted to EPS rack and pinion steering gear (1). It is not serviced separately and must be replaced as an assembly.
Turning of the steering wheel is converted to linear (side-to-side) travel through the meshing of the helical pinion teeth with the rack teeth within the steering gear. The lateral travel pushes and pulls the tie rods to change the direction of the vehicle's front wheels. Power assist steering is provided by an electric motor connected to the steering column. The EPS system provides variable assist for steering maneuvers based on several inputs, including vehicle speed, Steering Angle Sensor (SAS), and vehicle voltage. The EPS system communicates over the Controller Area Network-Chassis (CAN-C) bus. The steering angle sensor is internal to the EPS rack and pinion, and outputs the SAS position to other modules.
Manual steering control of the vehicle can be maintained if power steering assist is lost. However, under this condition, steering effort is significantly increased.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.