What Does This Indicator Mean?
The Mitsubishi Red Electric Power Steering EPS Warning Light illuminates on your instrument cluster when the vehicle’s electronic power assist system experiences a critical fault. Unlike traditional hydraulic systems, modern Mitsubishi vehicles utilize an Electric Power Steering architecture consisting of a steering angle sensor, torque sensor, an electronic control unit, and a high-torque electric motor mounted directly to the steering column or rack. The Electronic Control Unit continuously monitors the operational current, motor temperature, and sensor feedback loops. When the system detects a severe electrical short, a complete loss of communication between the EPS module and the Powertrain Control Module, or an internal motor failure, it triggers this red warning indicator to inform the driver that power steering assistance has been entirely deactivated.
Can I Still Drive with This Light On?
You cannot and must not drive the vehicle when this red indicator is illuminated. Because the severity color is red, it dictates an immediate safety hazard. A red EPS light means the electric power assist has shut down completely, forcing the vehicle into manual steering mode. At low speeds, parking, or performing evasive maneuvers, turning the steering wheel will require immense physical force, often making the vehicle nearly impossible to control safely. Continuing to drive risks a complete loss of steering control, potential mechanical binding in the steering shaft, or catastrophic thermal damage to the steering control module and wiring harness.
Common Causes of the Warning
- Low System Voltage or Alternator Failure: The EPS electric motor draws high electrical current. If the battery state of health is degraded or the alternator fails to maintain a consistent 13.5 to 14.4 volts while running, the EPS module will shut down to protect itself.
- Torque Sensor or Steering Angle Sensor Malfunction: Internal sensors that measure driver steering input can fail, drift out of calibration, or suffer from internal circuit board degradation, preventing the control module from calculating the required assist torque.
- Corroded Wiring Harness or Ground Connections: Water intrusion, road salt, or physical chafing can compromise the high-current power wires or CAN bus communication lines running to the EPS motor and control module assembly.
How to Diagnose and Reset It
Diagnosing a red EPS warning light on a Mitsubishi requires specialized diagnostic equipment because generic OBD-2 code readers typically only scan engine codes. You must use an advanced diagnostic scan tool capable of communicating with the Chassis and Body control modules to retrieve specific diagnostic trouble codes stored in the EPS memory. Begin by performing a visual inspection under the dashboard and hood, checking the main power fuses and looking for signs of water leaks or corroded wiring terminals. Next, test the vehicle’s battery voltage using a digital multimeter both at rest and while the engine is running to rule out a charging system fault. If low voltage is present, correct the electrical supply, clear the fault codes using the bidirectional scan tool, and perform a steering angle sensor zero-point calibration if required by the manufacturer’s diagnostic procedure to successfully extinguish the warning light.