Common Symptoms of a Faulty Brake Pedal Position Sensor

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The Brake Pedal Position Sensor (BPPS) detects the driver's braking demands and transmits signals representing the brake pedal's position to the Electronic Control Unit (ECU). The ECU uses this information for various purposes such as activating the Anti-lock Brake Sensor (ABS), Traction Control System (TCS), and center high-mounted stop light, and to illuminate the brake lights.

A properly functioning BPPS is essential for the safety of any vehicle as it ensures that the braking system functions correctly. If the BPPS malfunctions, it can cause issues such as the brake lights failing to turn on or the vehicle not being able to stop correctly, potentially resulting in injury to the driver and others. This article highlights common symptoms of a faulty BPPS, helping identify potential problems and their underlying causes.

What Causes Brake Pedal Position Sensor Failure?

Physical Damage: Collision, corrosion, or excessive vibration involving the brake pedal can damage the sensor, resulting in malfunction.

Electrical problems: The BPPS relies on electrical signals to communicate with the ECU. Loose connections or damage to the sensor's electrical wiring can disrupt these signals. As a result, the sensor may fail to transmit accurate information or may stop functioning altogether.

Contamination: Moisture, dirt, or debris can enter the sensor or its connections, disrupting its operation.

Wear and Tear: The BPPS may degrade over time due to exposure to heat, vibration, and environmental factors, leading to performance deterioration and eventual failure. Prolonged use under normal conditions can also cause internal component fatigue or wear.

Common Symptoms of a Faulty Brake Pedal Position Sensor

Malfunction Indicator Light (MIL) or Check Engine Light (CEL) Illuminates

A malfunctioning BPPS may trigger the vehicle's onboard diagnostics system to illuminate the MIL and store a corresponding Diagnostic Trouble Code (DTC) in its memory. Since the MIL can illuminate for a variety of issues, the vehicle must be checked using a Scan Tool to determine the exact cause. A malfunctioning BPPS can also trigger other dashboard lights such as ABS, TCS, etc.

Your Vehicle Cannot Start

In most vehicles you must press the brake pedal to start the vehicle. When the BBPS fails, your vehicle does not receive any signals from the BBPS, which prevents you from starting the vehicle.

Malfunctioning Brake Lights

If the BPPS malfunctions, it sends inaccurate signals to the ECU. In such cases, the brake lights may remain on when you turn your vehicle off. This malfunction is caused by a short circuit which makes the system determine that the brake pedal is still being pressed. Not only does this condition cause premature wear on the brake lights, it also results in a parasitic drain on the battery.

Conversely, if the switch fails to sense movement of the pedal, the brake lights won't activate. This creates a potentially hazardous situation while driving.

Identify a Faulty Brake Pedal Position Sensor with the Innova Scan Tool

The Innova Scan Tool is a highly effective diagnostic device that can quickly identify issues within a vehicle's systems. It aids in identifying and resolving problems related to the Brake Pedal Position Sensor (BPPS) by retrieving Diagnostic Trouble Codes (DTCs) associated with the sensor. With an Innova Scan, you can retrieve DTCs and the I/M status of the vehicle, as well as Freeze Frame data stored in the vehicle's computers. This tool is a highly effective aid in diagnosing BPPS-related issues in vehicles, helping you accurately identify and resolve problems.

Please visit us at innova.com/support or pro.repairsolutions.com/Support for additional information.

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