OBD Guide
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P0557

Brake Booster Pressure Sensor Circuit Low

P0557 is an OBD-II diagnostic trouble code meaning: Brake Booster Pressure Sensor Circuit Low. Common causes: broken signal wire of the amplifier pressure sensor, sensor circuit short to ground. Estimated repair cost: $33–278.

Severity
🔴 High
Can you drive?
Do not drive — repair immediately
Approx. repair cost
$33–278 (est.)

Symptoms

  • Hard brake pedal (increased pressing force)
  • Increased braking distance
  • Check Engine Light and/or Brake Warning Light Illuminates
  • Hissing sound when pressing the brake pedal
  • Emergency engine operation

Causes

  • Broken signal wire of the amplifier pressure sensor
  • Sensor circuit short to ground
  • Vacuum booster pressure sensor malfunction
  • Vacuum leak in brake booster or lines
  • Vacuum pump malfunction (on diesel engines)

How to Fix

  1. IMMEDIATELY check braking performance and brake pedal stiffness.
  2. Inspect the booster vacuum hoses for cracks and leaks.
  3. Check the vacuum level in the amplifier (should be 650–750 mmHg)
  4. Measure the voltage and resistance in the pressure sensor circuit
  5. If the circuit malfunctions, restore the wiring or replace the sensor
  6. If there is a vacuum leak, replace the amplifier membrane or the entire amplifier

Related codes

P0556P0558P0571C0035C0040

Error P0557 by Vehicle Brand

AcuraAudiBAICBMWBYDBuickCadillacChanganCheryChevroletChryslerCitroenDodgeDongfengExeedFAWFordForthingFotonGACGMGMCGeelyGreat WallHavalHondaHongqiHyundaiInfinitiJACJaecooJaguarJeepJetourKaiyiKiaLadaLexusLi AutoLifanLincolnLivanMazdaMercedes-BenzMercuryMitsubishiNIONissanOldsmobileOmodaOpelPeugeotPlymouthPontiacRenaultSWMSaturnSkodaSkywellSubaruSuzukiTankToyotaVolkswagenVolvoVoyahXPengZeekrZotye

FAQ

What does the P0557 code mean?

P0557 is an OBD-II diagnostic trouble code that indicates: Brake Booster Pressure Sensor Circuit Low

What causes a P0557 error code?

The most common causes of P0557 include: Broken signal wire of the amplifier pressure sensor; Sensor circuit short to ground; Vacuum booster pressure sensor malfunction; Vacuum leak in brake booster or lines.

How do I fix a P0557 diagnostic trouble code?

To fix P0557: IMMEDIATELY check braking performance and brake pedal stiffness.. Inspect the booster vacuum hoses for cracks and leaks.. Check the vacuum level in the amplifier (should be 650–750 mmHg). For a complete diagnosis, use an OBD-II scanner.

Is it safe to drive with P0557?

Do not drive — repair immediately

How much does it cost to fix P0557?

The estimated repair cost for P0557 is $33–278. Actual cost depends on your vehicle, location, and labor rates.

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See also: Russian version · NationStat