P0556 on Toyota
Brake Booster Pressure Sensor Circuit Range/Performance
P0556 on Toyota vehicles indicates brake booster pressure sensor circuit range/performance. Au7o has documented this code across 1 Toyota model — most commonly on Camry. The brake booster pressure sensor signal is present but out of the expected range or implausible relative to operating conditions. A range/performance fault.
Common Causes of P0556
- •Faulty brake booster pressure sensor
- •Vacuum leak at the booster or hose
- •Wiring resistance / poor connection
- •Failing vacuum source / pump
- •Faulty PCM input
P0556 on Toyota by Model
Toyota Camry(1 issue)
- Certain 2018-2019 Camry Vacuum-Pump Brake-Assist Recall - 21V8902018-2019
NHTSA recall 21V890/Toyota 21TA09 covers certain non-hybrid 2018-2019 Camrys with the A25A-FKS engine, not Camry Hybrids or every vehicle in those model years. An affected vacuum-pump vane end cap can wear, break and lodge between the vane and housing, stopping the pump and suddenly reducing brake assist. The service brakes still function, but pedal effort increases and braking performance may be reduced, increasing crash risk. Toyota reports no expected advance warning before the condition occurs.
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View P0556 across all makes →Frequently Asked Questions
What does P0556 mean on Toyota?▼
P0556 stands for "Brake Booster Pressure Sensor Circuit Range/Performance." The brake booster pressure sensor signal is present but out of the expected range or implausible relative to operating conditions. A range/performance fault. On Toyota specifically, this code is documented across 1 model.
What causes P0556 on Toyota vehicles?▼
Common causes on Toyota: Faulty brake booster pressure sensor, Vacuum leak at the booster or hose, Wiring resistance / poor connection, Failing vacuum source / pump, Faulty PCM input. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0556 on a Toyota?▼
Repair costs vary widely depending on the root cause and specific Toyota model.
Which Toyota models have P0556 documented?▼
Au7o has documented P0556 on 1 Toyota model: Camry.