C0592

Code

Generic C — Chassis

Brake Booster Motor B Phase U-V-W Current High

Brand: Generic

Type: C — Chassis

Views: UK: 22 EN: 29 RU: 18

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Page language: EN

Short to ground or short to battery in one or more motor phase wires
Motor windings partially shorted or internally damaged
Mechanical binding or seizure of the brake booster motor or connected mechanism
Faulty motor driver or power transistor(s) in the controller/ECU
Poor connector contact, corrosion or damaged insulation causing intermittent shorts
Low battery voltage or poor ground causing abnormal current draw during control pulses

Retrieve freeze frame and full scan data; note battery voltage at fault time
Visual inspection of brake booster motor, wiring harness, connectors and grounds for damage, corrosion, rubbing or intrusion
Check vehicle battery state-of-charge and charging system health before testing
With ignition on (per service manual), command motor and listen/observe motor operation and locking
Inspect connector pins for corrosion, bent pins, or water ingress

Battery/vehicle bus voltage (expected ~ nominal system voltage under load)
Phase currents for U, V, W (compare relative magnitudes; high or imbalanced indicates problem)
Phase-to-phase and phase-to-ground resistance of motor windings (ohms)
Motor driver command signal (PWM duty/frequency from control module)
Diagnostic trouble code freeze-frame: recorded voltage/current and vehicle conditions

Read and record DTC(s) and freeze frame data with a capable scan tool; attempt to reproduce fault per manufacturer procedure
Perform visual inspection of motor, harness and connectors for damage, corrosion, rubbing or water intrusion; repair as needed
Verify battery voltage and ground integrity. Charge or replace battery if low; ensure strong ground connections at chassis and module
Disconnect motor connector; measure resistance between each phase (U-V, V-W, U-W) and each phase-to-ground. Compare to service limits and look for low resistance to ground (short)
Check continuity of each phase wire back to control module; inspect for shorts to chassis or battery using an ohmmeter/insulation tester
If available, use a current clamp to measure phase currents while commanding the motor through the scan tool. Note any single phase much higher than others or above spec
If wiring and motor resistance are normal, test/verify motor driver outputs at the control module (scope recommended) for correct PWM and absence of shorted transistor(s). Replace module if driver stage failed
If motor shows excessive mechanical resistance, remove and bench-test motor (spin freely by hand, apply low-voltage test) or replace motor assembly
Clear codes and perform road test or operation cycle to confirm repair; re-scan to ensure fault does not return

Damaged/shorted phase wire or connector to Brake Booster Motor B
Worn bearings or debris causing motor to stall under load
Failed motor driver stage in the brake control module
Contamination or water intrusion in the motor assembly causing electrical leakage

⚠️ Status

Brake Booster Motor B phase current exceeded the allowed threshold (U/V/W). Control module detected overcurrent/overload condition and set DTC C0592.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.5-3.0 hours

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