Code C0641 indicates that the brake pressure sensor circuit is open, meaning the Powertrain Control Module (PCM) or ABS module has detected a loss of continuity in the sensor's electrical circuit. This typically prevents the system from accurately monitoring brake pressure, which can affect stability control and anti-lock braking functions.
The sensor itself is the most common failure point; internal open circuits or corrosion can break the electrical path.
Wires to the sensor may be chafed, broken, or corroded, especially near the wheel well or undercarriage, causing an open circuit.
Insufficient fluid or air in the system can cause the sensor to read incorrectly, though this is less likely to produce an open-circuit code.
The ABS module that processes the sensor signal may have an internal open circuit or failed driver, but this is less common than sensor or wiring issues.
The PCM itself can develop an internal open circuit, but this is extremely unlikely and should only be considered after all other possibilities are exhausted.
It is not recommended. The code indicates a loss of brake pressure signal, which can disable ABS, stability control, and possibly reduce braking effectiveness. Have the vehicle inspected as soon as possible.
No. The PCM is rarely the cause. Most often the brake pressure sensor itself or its wiring is at fault. Replacing the PCM without proper diagnosis is wasteful and usually incorrect.
Clearing the code may turn off the warning light temporarily, but if the underlying open circuit remains, the code will return. Diagnosis and repair are necessary.
Costs vary widely by vehicle and location. A sensor replacement is typically moderate, while wiring repairs can be less expensive. We cannot provide specific prices; consult a qualified technician for an estimate.