This code indicates that the control module has detected an abnormally high voltage in the Phase U, V, or W circuits of the Brake Booster Motor B. This typically points to a short to power, a failed internal motor winding, or a ground reference issue within the electronic brake booster assembly.
Internal shorting or an open winding within the brake booster motor can cause abnormal voltage readings on the phase circuits.
A short to voltage, corroded terminals, or a poor ground connection in the phase U/V/W circuits can trigger a high voltage condition.
A stuck closed relay can supply continuous battery voltage to the motor circuit, causing a high voltage state.
The internal driver circuitry of the dedicated brake control module may fail, incorrectly applying or reading high voltage on the phase circuits.
The main powertrain control module is rarely the cause, but could theoretically fail to interpret the high voltage signal correctly.
No, replacing the PCM is a common misdiagnosis for this code. The fault is almost always in the brake booster motor, its wiring, or the dedicated brake control module, not the main powertrain computer.
No, a high voltage condition in the brake booster motor circuit can result in a sudden loss of braking assist, making the pedal very hard to push and significantly increasing stopping distance.
It means the system detected higher than expected voltage in the three-phase motor circuit that drives the brake booster, usually indicating a short to power, a poor ground, or an internal motor failure.
Not without proper diagnosis. If a wiring short or a failed relay caused the code, installing a new motor will not fix the issue and could potentially damage the replacement component.