Electronic Power Steering Motor Circuit Malfunction
What does C0150 mean?
The C0150 code means the vehicle's onboard diagnostic system has detected: Electronic Power Steering Motor Circuit Malfunction. This is a critical severity code.
Common Symptoms
- Power steering warning light on
- Heavy or hard steering
- Power steering assist intermittent
- Steering feels different at various speeds
- EPS fault message on dashboard
Probable Causes (Ranked by Likelihood)
- Failed electric power steering motor Very High
- EPS control module failure High
- Corroded EPS motor connector Moderate
- Wiring harness damage to EPS motor Low
Step-by-Step Diagnostic Procedure
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Scan EPS module for DTCs
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Check EPS motor connector for corrosion
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Test power supply and ground at EPS motor
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Monitor EPS motor current draw with scan tool
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Inspect wiring harness to EPS unit
Frequently Asked Questions
Can I drive without power steering assist?
Yes, but the steering will be very heavy, especially at low speeds and when parking. At highway speeds it is more manageable. Drive cautiously and repair as soon as possible.
Is electric power steering different from hydraulic?
Yes. Electric power steering uses an electric motor instead of a hydraulic pump and fluid. It is more fuel efficient but the steering feel differs, and repairs often involve electronic components.
Why is EPS repair so expensive?
The EPS motor and control module are precision electronic components. On some vehicles, the motor is integrated into the steering rack, requiring rack replacement for a motor failure.