Code C0592 indicates that the powertrain control module (PCM) has detected an abnormally high current draw in one or more phases (U, V, W) of the brake booster motor B. This typically points to a short circuit, a failing motor, or a control module issue within the electric brake booster system.
The motor itself may have internal winding shorts or a seized rotor, causing excessive current draw in one or more phases.
Damaged insulation, chafed wires, or a corroded/pinched connector can create a direct short to ground or between phases, raising current.
The module that drives the motor may have a shorted power transistor or internal fault, causing uncontrolled high current.
Insufficient voltage or a bad ground can cause the motor to draw higher current as it tries to compensate, though this is less common.
Rarely, the PCM itself may misread current or command excessive motor operation. This is the least likely cause and should only be considered after all other components are verified.
It is not recommended. The code indicates a high current condition that could lead to brake booster failure, reduced braking assist, or even a fire risk. Have the vehicle diagnosed and repaired promptly.
Almost never. The PCM is rarely the cause of this code. The problem is almost always in the brake booster motor, its wiring, or the dedicated brake booster control module. Replacing the PCM without proper diagnosis is a costly mistake.
It refers to the three electrical phases of the brushless DC motor that drives the brake booster. The code means the current in one or more of these phases is higher than the expected range.
Costs vary widely depending on the root cause. A simple wiring repair may be inexpensive, while replacing the brake booster motor or control module can be several hundred dollars. Diagnosis by a qualified technician is essential to avoid unnecessary parts replacement.