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XC90 2003 2.5t AWD - Brake Assist Service Required Simple Fix

A mid-size luxury crossover SUV, the Volvo XC90 made its debut in 2002 at the Detroit Motor Show. Recognized for its safety, practicality, and comfort, the XC90 is a popular vehicle around the world. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America). P2 platform.
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ALF1
Posts: 18
Joined: 1 April 2015
Year and Model: XC90 2003 2.5
Location: United States
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XC90 2003 2.5t AWD - Brake Assist Service Required Simple Fix

Post by ALF1 »

After replacing the Brake Position Sensor on my 2003 Volvo XC90 2.5t AWD with 250,000 miles (which is located on the Brake Booster body) the car issued a 'Brake Assist Service Required' warning and a code P0573 (OBDII) which translates in Volvo code to-- ECM-900C -- Brake pedal sensor -- Signal too low . Also, the cruise control stopped working.

Others in this forum have noted that this means that something is wrong with the Brake Position Sensor. In my case, it was a loose electrical connection where the car's electrical fitting connects to the Brake Position Sensor's electrical connector.
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