The P0555: Brake Booster Pressure Sensor Circuit code indicates that the engine control module (ECM) has detected an issue with the brake booster pressure sensor circuit. This sensor monitors the pressure in the brake booster to ensure proper brake function. A problem with this circuit can lead to inconsistent brake performance and reduced braking efficiency.
P0555 – Quick Overview
| Code | Information |
|---|---|
| Meaning | P0555: Brake Booster Pressure Sensor Circuit |
| Is it serious? | Yes, as it can lead to compromised braking performance and safety concerns. |
| Possible causes | – Faulty brake booster pressure sensor – Wiring issues – Faulty brake booster |
| How to diagnose? | – Test the brake booster pressure sensor – Inspect wiring for faults – Check the brake booster |
P0555 Meaning
The P0555: Brake Booster Pressure Sensor Circuit code is triggered when the ECM detects a malfunction in the brake booster pressure sensor circuit. This sensor helps monitor the vacuum or hydraulic pressure in the brake booster, ensuring that sufficient assist is provided to the brake system. If the sensor or circuit is faulty, it can lead to poor brake performance or increased stopping distances.
Step-by-step diagnostic guide
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check for related fault codes that might provide more information about the brake system issue. | OBD-II Scanner |
| Test the Brake Booster Pressure Sensor | Use a multimeter or diagnostic tool to measure the output of the brake booster pressure sensor and ensure it matches manufacturer specifications. | Multimeter, Diagnostic Tool |
| Inspect Wiring for Faults | Visually inspect the wiring and connectors leading to the brake booster pressure sensor for signs of damage, corrosion, or disconnection. | Flashlight, Multimeter |
| Check the Brake Booster | Inspect the brake booster for any signs of wear, leaks, or malfunction that could affect pressure readings and brake assist. | Basic Tools, Inspection Mirror |
| Clear the Code and Test Drive | After repairs, clear the code using an OBD-II scanner and test drive the vehicle to ensure proper brake booster operation. | OBD-II Scanner, Vehicle Manual |
| Recheck for Codes | Re-scan the vehicle after the test drive to ensure the P0555 code hasn’t returned. | OBD-II Scanner |
OBD-II scanner Buyer’s Guide
- Scanner features explained
- Different types of scanners
- Scanners for coding/odometer/ECU/checks
- Best picks + discount codes
I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko