Thus, this code requires immediate attention.To ensure correct installation of the remote vacuum servo unit, thoroughly read and adhere to the fitting instructions prior to carrying out any work on the vehicle. Usually, though, this condition progress over time if not corrected, which could pose a safety risk. Severity for this problem depends on the specific malfunction. Repair or replacement of power steering pump, fluid connection, fluid and lines level Replacement of faulty brake booster pressure sensor Resistance or no continuity means there’s a faulty wiring or connector issue that is shorted or open, which must be repaired, if not replaced.ĭepending on your diagnosis, common repairs for this code include: This test is always performed with power removed from the circuit, while normal readings should start at 0 ohms of resistance unless otherwise specified by the technical data from the TSB. If this process confirms the absence of power source or ground, then you should conduct a continuity test to check the condition of the connectors and wirings. The correct voltage input to a sensor without output voltage is usually a sign of internal failure. Thus, tech data must be referenced to obtain the right voltage range from the brake booster pressure sensor, and the appropriate troubleshooting sequence. Īs said earlier, the voltage requirement may vary between cars, the configuration of the brake booster pressure sensor circuit, and all components incorporated into the system. This includes the use of a digital multimeter, and specific technical references for your, as the voltage requirement is usually based on the make, model, and specific year of your. Next step for diagnosis is usually specific and may require the appropriate and advanced equipment to be conducted properly. Vacuum lines must be checked for weather cracks, leaks, and overall serviceability level. Also, check the connectors for signs of corrosions buildup, or damaged pins. As soon as you find these components, inspect the connectors and wirings for signs of damages, such as scraping, bare wires, burn spots, rubbing, etc. This includes the sensor itself, the brake booster, vacuum lines, wirings, and connectors to the PCM. Start by locating all components related to the Brake Booster Pressure Sensor Circuit. Unresponsive brake pedal (pressing the brake pedal requires increase effort)ĭefective one-way valve in the vacuum brake booster supply hoseĪs with most trouble codes, it is best to refer with your TSB (Technical Service Bulletin) when troubleshooting this code. Other common symptoms include:Ĭheck brake light flashes or stays illuminated When this code appears, it will illuminate the Check Engine light, or flash it when braking. While for other makes, your may require multiple ignition cycles before this code pops up. Other related brake booster pressure sensor circuit error codes include:įor some cars, this code only appears when applying the brakes. Specific situations determine the code which the PCM activates. When the brake booster pressure sensor circuit has low output voltage for the PCM, then this code is set. When this appears, it means the PCM (powertrain control module, also known as ECM or engine control module in other makes) has determined an error indicating that the brake booster pressure sensor circuit is out of range, or not running properly due to abnormal feedback. Įrror Code P0557 is one of the many possible codes associated with the brake booster pressure sensor circuit. This process is crucial for the power brakes to work efficiently and safely, and safely slow down or stop your with a minimum amount of foot pressure being applied to your. This process is controlled by the PCM to allow your to adapt to various braking situations and adjust the pressure needed by your to assist the operation of the brake pedal. The job of the brake booster pressure sensor circuit is to monitor the amount of pressure (vacuum) applied to the power brake booster. Though generic, specifications on the definition, troubleshooting, and repairs may vary by year, make, model, and powertrain configurations of your. It’s particularly common, but not limited to Acura, Alfa Romeo, Chevrolet, Dodge, Ford, Hyundai, Nissan, Pontiac, Subaru, etc. This code is a generic trouble code, meaning it applies to all cars equipped with the OBD-system and brake booster pressure sensor. Error Code P0557 is defined as Brake Booster Pressure Sensor Circuit Low, meaning there’s a problem with the brake booster pressure sensor circuit, which could be caused by a faulty sensor, broken circuits, or vacuum leaks.
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