C0150 critical

Electronic Power Steering Motor Circuit Malfunction

The C0150 code means the vehicle's onboard diagnostic system has detected: Electronic Power Steering Motor Circuit Malfunction. This is a critical severity code.

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Keep driving?: Short distances only
DIY difficulty: hard
Estimated cost: $500 - $2,000 (parts and labor)

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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

Scan EPS module for DTCs
Check EPS motor connector for corrosion
Test power supply and ground at EPS motor
Monitor EPS motor current draw with scan tool
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.