P0555
PowertrainBrake Systemhigh severityBrake Booster Pressure Sensor Circuit Range/Performance
What P0555 Means
The brake booster pressure sensor signal is outside the expected range. The reading does not match actual booster vacuum or pressure conditions.
Symptoms
- Check engine light on
- Hard brake pedal feel
- Possible cruise control disable
Common Causes
- Faulty brake booster pressure sensor
- Vacuum leak at booster
- Damaged wiring or connector
- Faulty PCM
Diagnostic Steps
- Retrieve freeze frame data
- Check booster vacuum with a gauge
- Inspect sensor wiring and connector
- Replace pressure sensor if faulty
🔌 Don't have a code reader?
Any of these will read and clear this code — pick by how deep you want to go.
Budget handheld~$40
ANCEL AD410 →
No-phone-needed handheld — reads, clears, live data, freeze frame.
✓ ANCEL official store
Serious DIY~$100
BlueDriver Pro →
Enhanced codes (ABS, airbag, TPMS) plus repair reports.
SHOP FAVORITEShop-grade tablet~$300
Autel MaxiCOM MK808S →
Bidirectional tests, service resets, all systems.
✓ Autel official store
Pro diagnostics$1,500+
Autel MaxiSys MS906 Pro →
Full-system pro platform — topology mapping, ECU coding, the works.
✓ Autel official store
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