DTC Code C1273 – What does this code mean?

<ul> <li><a href="/problems/abs-light-is-on"><b>ABS Warning Light ON</b></a>: The Anti-Lock Brake System (ABS) warning light illuminates on the dashboard, indicating a potential issue with the ABS system. This can be linked to a malfunctioning rear speed sensor on the right side, which affects the ABS's ability to monitor wheel speed accurately.</li> <li><a href="/problems/engine-warning-light-on"><b>Engine Light ON</b></a>: The engine light, or service engine soon warning light, may turn on. This symptom suggests a broader issue that could be related to the low output signal from the rear speed sensor, impacting the vehicle's overall performance and safety systems.</li> </ul>

<ul><li>The rear speed sensor on the right side may be faulty, often due to wear or damage, affecting its ability to send accurate signals.</li><li>The rotor associated with the rear speed sensor on the right side might be damaged or misaligned, leading to incorrect readings.</li><li>An open or shorted harness in the rear speed sensor right can disrupt the signal transmission, causing the error code.</li><li>Poor electrical connections in the rear speed sensor right circuit can lead to intermittent or weak signals, triggering the error.</li></ul>

<ul> <li><b>Verify DTC Code</b>: Confirm the presence of DTC C1273 using a diagnostic scanner. Clear the code and perform a test drive to see if it reappears.</li> <li><b>Inspect Rear Speed Sensor</b>: Visually inspect the right rear speed sensor and its wiring for any signs of damage, corrosion, or disconnection.</li> <li><b>Check Sensor Signal</b>: Use an oscilloscope to check the output signal of the right rear speed sensor. Compare it with the expected waveform to identify any discrepancies.</li> <li><b>Test Sensor Resistance</b>: Measure the resistance of the right rear speed sensor using a multimeter. Compare the reading with the manufacturer's specifications to ensure it is within range.</li> <li><b>Inspect Rear Axle Hub and Bearing Assembly</b>: Since the Rear Axle Hub and Bearing Assembly cannot be disassembled, inspect it for any signs of wear or damage that might affect the sensor's performance.</li> <li><b>Replace Rear Axle Hub and Bearing Assembly</b>: If the sensor is faulty, replace the entire Rear Axle Hub and Bearing Assembly as per the useful information provided.</li> <li><b>Re-test and Verify Repair</b>: After replacement, clear the DTC and perform a test drive to ensure the issue is resolved and the code does not return.</li></ul>

<p>The DTC C1273 indicates a <b>low output signal from the rear speed sensor on the right side</b>. This issue can lead to inaccurate readings for the vehicle's stability control and anti-lock braking systems. <ul><li>Potential risks include reduced braking efficiency and compromised vehicle stability.</li><li>While not immediately critical, addressing this issue promptly is important to maintain optimal safety and performance.</li></ul></p>