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DTC codes / C05xx · Brakes, steering and suspension / C0582

C0582Brake Booster Motor A Phase U-V-W Circuit Range/Performance

C0582 indicates that the electronic brake control module has detected an out-of-range or performance fault in the phase U, V, or W circuit of the brake booster motor's three-phase inverter. The module monitors current, voltage, and motor position feedback for each phase and sets this code when the signals deviate from expected values during self-test or booster operation.

SystemChassis
Code typeGeneric (all makes)
SeverityHigh
Fix difficultyProfessional
AreaBrakes, steering and suspension

Symptoms you may notice

  • Illumination of the brake system warning light, often accompanied by the traction control or stability control warning light
  • A hard brake pedal with reduced power assist, requiring noticeably higher pedal effort to stop the vehicle
  • Audible whining or grinding noises from the brake booster area during brake pedal application
  • Intermittent loss of brake assist that may return after the vehicle is restarted
  • Often no symptoms besides the warning light, especially if the fault is intermittent or only affects one phase at low load

Common causes, most likely first

  1. Damaged or chafed wiring in the brake booster motor phase harness, particularly at flex points or near heat sources
  2. Corroded or loose terminals at the brake booster motor connector or the electronic brake control module connector
  3. Internal failure of the brake booster motor windings, such as a short between phases or to ground
  4. Faulty inverter circuit inside the electronic brake control module, including failed driver transistors or current sensors
  5. Water intrusion into the brake booster motor connector or control module enclosure causing intermittent phase faults
  6. Mechanical binding or excessive drag in the brake booster motor assembly that overloads one or more phases

How to diagnose and fix it

  1. Perform a visual inspection of the brake booster motor harness and connectors for chafing, corrosion, or loose pins, and repair as needed
  2. Use a scan tool to clear the code and verify whether it returns immediately or only under specific operating conditions such as cold start or heavy braking
  3. Measure resistance and insulation between each phase (U, V, W) at the motor connector and compare to manufacturer specifications to rule out motor winding faults
  4. Back-probe the phase circuits at the control module connector while commanding the booster motor with a scan tool to check for voltage drops or abnormal current waveforms
  5. Check for technical service bulletins or software updates for the electronic brake control module that address false phase fault detection
  6. If wiring and motor test good, replace the electronic brake control module and perform any required programming or calibration
  7. After repair, clear codes and perform a full brake system function test including booster operation and stability control self-test

What the phase fault really means

  • A phase U-V-W range or performance code often results from a marginal connection that only breaks down under vibration or heat, so a simple static resistance check can pass while the fault remains intermittent.
  • Technicians sometimes replace the brake booster motor when the actual fault is a failed current sensor inside the control module, so always verify phase current waveforms before condemning the motor.
  • This code can be set by a low or weak 12-volt supply to the control module, so check battery voltage and ground integrity before diving into phase circuit diagnostics.
  • After any repair involving the brake booster motor or control module, a calibration or learn procedure is typically required, and skipping it can cause the code to reset or the brake assist to feel abnormal.
  • The phase circuits are pulse-width modulated, so a standard multimeter may show plausible average voltages even when one phase driver is failing; an oscilloscope or a scan tool with live motor data is far more revealing.

Can I keep driving with C0582?

Because this fault can reduce or eliminate power brake assist, the vehicle should not be driven until the cause is corrected; if you must move it, do so at very low speed with firm pedal pressure and be prepared for increased stopping distance.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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