P0558: Brake Booster Pressure Sensor Circuit High Input
What to do
Check that the brake pedal feels normal with the engine running before driving any distance.
What this code means
The brake booster pressure signal is above its plausible range — the mirror of the circuit-low fault, and usually an open circuit or a signal wire on a supply. As with the low-input code, confirm the actual pedal feel rather than inferring the state of the brakes from the sensor's reading.
Likely causes
Start here
- Open circuit in sensor wiring · moderate
- Faulty brake booster pressure sensor · moderate
- Corroded or loose connector · easy
Less common
- Signal wire shorted to voltage · moderate
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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