P0556 on Ford
Brake Booster Pressure Sensor Circuit Range/Performance
P0556 on Ford vehicles indicates brake booster pressure sensor circuit range/performance. Au7o has documented this code across 1 Ford model — most commonly on F-150. The brake booster pressure sensor signal is present but out of the expected range or implausible relative to operating conditions. A range/performance fault. Typical repair costs on Ford range from $300 to $800, depending on the specific model and root cause.
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 Ford by Model
Ford F-150(1 issue)
- Brake Vacuum Pump Failure (EcoBoost)2015-2020
The vacuum pump that provides brake assist on EcoBoost F-150s can fail, resulting in a hard brake pedal and reduced braking assist. Since turbo engines don't produce intake vacuum like naturally aspirated engines, they rely on this pump.
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View P0556 across all makes →Frequently Asked Questions
What does P0556 mean on Ford?▼
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 Ford specifically, this code is documented across 1 model.
What causes P0556 on Ford vehicles?▼
Common causes on Ford: 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 Ford?▼
Repair costs on Ford range from $300 to $800, depending on the specific model and root cause.
Which Ford models have P0556 documented?▼
Au7o has documented P0556 on 1 Ford model: F-150.