DTC Code C100E – What does this code mean?

<ul> <li><b>Anti-Lock Brake System (ABS) Warning Light ON</b>: The ABS warning light illuminates when there is an issue with the brake pedal angle sensor circuit. This can affect the vehicle's ability to manage braking force distribution, potentially leading to reduced braking efficiency. <causes> may include a faulty brake pedal angle sensor, damaged wiring, or a malfunctioning ABS control module.</li> <li><b>Engine Light ON (or Service Engine Soon Warning Light)</b>: The engine light or service engine soon warning light may turn on due to the brake pedal angle sensor circuit issue. This indicates a problem that could affect the vehicle's overall performance and safety. <causes> may include sensor failure, electrical issues, or a problem with the vehicle's electronic control unit (ECU).</li> </ul>

<ul><li>The brake pedal angle sensor may be faulty, leading to incorrect readings or no signal at all.</li><li>An open or shorted harness in the brake pedal angle sensor can disrupt the signal transmission.</li><li>Poor electrical connections in the brake pedal angle sensor circuit can cause intermittent or no signal issues.</li></ul>

<ul> <li><b>Initial Inspection</b>: Visually inspect the brake pedal angle sensor and its wiring for any signs of damage, corrosion, or loose connections.</li> <li><b>Check for DTC Variants</b>: Identify the specific variant of the C100E code (21, 22, or 38) to determine the nature of the signal issue (amplitude too low, too high, or incorrect frequency).</li> <li><b>Measure Signal Amplitude</b>: Using a multimeter, measure the signal amplitude from the brake pedal angle sensor. Compare the readings to the manufacturer's specifications to confirm if the amplitude is below or above the acceptable range.</li> <li><b>Frequency Analysis</b>: Use an oscilloscope to check the signal frequency from the brake pedal angle sensor. Ensure the frequency matches the expected values as per the manufacturer's guidelines.</li> <li><b>Sensor Power Supply Check</b>: Verify that the sensor is receiving the correct voltage supply. Check the power and ground circuits for continuity and proper voltage levels.</li> <li><b>Connector and Wiring Inspection</b>: Inspect the sensor connector and associated wiring for any signs of wear, corrosion, or damage. Repair or replace as necessary.</li> <li><b>Sensor Replacement</b>: If all previous checks are within specifications and the issue persists, replace the brake pedal angle sensor and clear the DTC code. Re-test to ensure the problem is resolved.</li></ul>

<p>The DTC code C100E indicates an issue with the Brake Pedal Angle Sensor Circuit 2. This is a critical issue as it directly affects the braking system's performance.</p><ul><li><b>Immediate Actions:</b> Inspect and repair the sensor circuit immediately.</li><li><b>Potential Risks:</b> Delayed repair can lead to brake failure, increasing the risk of accidents.</li></ul>