Error code
OBD2 P0556
OBD2P0556
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
Brake Booster Pressure Sensor Circuit Range/Performance.
Severity
moderateCan drive but should be checked soon as it affects braking efficiency.
Summary
P0556 indicates an issue with the brake booster pressure sensor circuit, which monitors the vacuum-assisted braking system's performance.
Common Causes
- Poor wiring or connection
- Faulty brake servo pressure sensor
Fixes
FAQ
What does P0556 mean?
P0556 indicates a problem with the brake booster pressure sensor circuit, which is crucial for monitoring the vacuum-assisted braking system.
How serious is P0556?
Moderately serious. It affects braking efficiency but does not prevent driving entirely.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P0500Vehicle Speed Sensor 'A'
- P0501Vehicle Speed Sensor 'A' Range/Performance
- P0502Vehicle Speed Sensor 'A' Circuit Low Input
- P0503Vehicle Speed Sensor 'A' Intermittent/Erratic/High
- P0504Brake Switch 'A'/'B' Correlation
- P0505Idle Air Control System
- P0506Idle Air Control System RPM Lower Than Expected
- P0507Idle Air Control System RPM Higher Than Expected
- P0508Idle Air Control System Circuit Low
- P0509Idle Air Control System Circuit High
- P0510Closed Throttle Position Switch
- P0511Idle Air Control Circuit