P0555 Code - Brake Booster Pressure Sensor Circuit

What Does P0555 Mean?

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Brake Booster Pressure Sensor Circuit

The Brake Booster uses vacuum to make the brake pedal easier to depress when braking. The Brake Booster Pressure Sensor measures the amount of vacuum inside the brake booster. If the engine computer sees an implausible signal from the Brake Booster Pressure Sensor, code P0555 will be set.

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What are the common causes of P0555 ?

The most common cause of this code being stored is from vacuum leaks to the vacuum brake booster or a defective brake booster pressure sensor. Other causes may include shorted or open electrical circuitry and connectors, cracked or broken vacuum hoses to the brake booster, or a defective one way valve in the vacuum brake booster supply hose. Hydraulic brake boosters often fail due to power steering malfunctions, because the power steering pump also supplies hydraulic pressure to the booster. In this case, low power steering fluid is the most common culprit. A defective power steering pump may also cause low hydraulic brake booster pressure.



How do you troubleshoot P0555 ?

Look at the plug wires to make sure they are not burnt or laying on the exhaust. With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. Now, clear the codes and test-drive the vehicle to see if the code is reset.

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