P0558
Brake Booster Pressure Sensor Circuit High
Brake booster / brakes
Generic OBD-II
High
What it means
P0558 means the brake booster pressure (vacuum) sensor is reporting a voltage higher than its normal range, so the ECM flags the circuit as faulty. It's an electrical fault in the sensor or its wiring rather than a brake failure — your brakes still work, though power assist and stability systems may behave differently.
High
Can I keep driving? Drivable, but treat with care — your brakes still work hydraulically, though power assist and stability systems may behave differently, so test the pedal and get it checked.
Common symptoms
What you'll notice
- Check-engine light on
- ABS or electronic stability control warning lights illuminated
- Harder brake pedal or increased pedal effort in some vehicles
- Brake assist system warning or reduced power assist
Common causes
Most likely first
- Faulty brake booster pressure (vacuum) sensorLikely
- Open circuit or short to voltage in the sensor's signal wiringCommon
- Poor or corroded electrical connection at the sensorCommon
- Faulty brake booster control moduleLess often
- Faulty engine control module (ECM)Less often
How to diagnose & fix
Work through it in order
- Inspect the sensor connector and wiring for damage, corrosion, or a short to voltage.
- Check the sensor's signal voltage against spec with a scan tool; a stuck-high reading points to the sensor or wiring.
- Test and replace the brake booster pressure sensor if it reads out of range.
- If wiring and sensor are good, test the brake booster control module and ECM, replacing only if confirmed faulty.
FAQ
Quick answers
Is it safe to drive with P0558?+
Your brakes still work, but this can affect power assist and stability systems, so drive gently, test the pedal, and have it diagnosed soon — don't ignore a brake-related warning.
Can I just clear P0558?+
It will come back until the sensor circuit fault is repaired. Because it involves the brake system, it's worth fixing rather than clearing.
Related codes
Often seen with P0558
Read & clear P0558 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX