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Engine-Codes – Scion – C1274 Scion

C1274 Scion Code - Low Output Signal of Rear Speed Sensor Left

Quick Answer

The C1274 code for Scion indicates a low output signal from the rear speed sensor on the left side of the vehicle. Common causes include Faulty rear speed sensor, Damaged wiring or connectors leading to the sensor, Corrosion or contamination affecting sensor performance. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
C1274 Scion indicates Low Output Signal of Rear Speed Sensor Left.
Common causes
Common causes include Faulty rear speed sensor, Damaged wiring or connectors leading to the sensor, Corrosion or contamination affecting sensor performance.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code C1274 Scion Description

The C1274 code for Scion indicates a low output signal from the rear speed sensor on the left side of the vehicle. This sensor is responsible for monitoring the speed of the rear wheels and providing this information to the vehicle's ABS (Anti-lock Braking System) and traction control systems. When the sensor detects a lower than expected output signal, it can lead to issues with the vehicle's stability control, ABS, and overall handling.

OBDII Code C1274 Scion - Low Output Signal of Rear Speed Sensor Left
C1274 Scion Code - Low Output Signal of Rear Speed Sensor Left

Common Causes of C1274 Scion

  1. Faulty rear speed sensor
  2. Damaged wiring or connectors leading to the sensor
  3. Corrosion or contamination affecting sensor performance
  4. Issues with the ABS control module or related components
  5. Physical damage to the sensor from road debris or impact

Symptoms of C1274 Scion

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunctions or engages unexpectedly
  3. Erratic braking behavior, such as pulsating brake pedal
  4. Decreased stability and handling, especially during braking or cornering

How to Fix C1274 Scion

  1. Begin by inspecting the rear speed sensor and its wiring for any visible damage or corrosion.
  2. Test the sensor's output signal using a diagnostic tool to verify the low signal output.
  3. Replace the rear speed sensor if it is found to be faulty, ensuring proper installation and connection.
  4. Clear the diagnostic trouble codes from the vehicle's system using a diagnostic tool.
  5. Test drive the vehicle to confirm that the issue has been resolved and that the ABS and traction control systems are functioning correctly.

Cost to Fix C1274 Scion

The typical repair costs for addressing a low output signal from the rear speed sensor on a Scion can range from $150 to $300, including parts and labor. However, the actual cost may vary depending on the specific diagnosis time, labor rates, and the price of the replacement sensor. It is recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model. Keep in mind that rates may differ based on location and the type of repair facility.

What does this mean?

Tech Notes for C1274 Scion

Because the Rear Axle Hub and Bearing Assembly cannot be disassembled, if the Rear Speed Sensor needs replacement, replace the Rear Axle Hub and Bearing Assembly.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about C1274 Scion Code

1. What are the common symptoms of OBDII code C1274 in a Scion related to the low output signal of the rear speed sensor left?

The common symptoms include ABS warning light illuminated on the dashboard, traction control system malfunction, and potential issues with the vehicle's stability control.

2. What are the possible causes of OBDII code C1274 in a Scion indicating a low output signal from the rear speed sensor on the left side?

Potential causes may include a faulty rear speed sensor, damaged wiring or connectors in the sensor circuit, or issues with the ABS module or traction control system.

3. How can I diagnose the OBDII code C1274 in my Scion indicating a low output signal from the rear speed sensor left?

Diagnosis typically involves using a professional OBDII scanner to read the code, inspecting the rear speed sensor and its wiring for damage, and testing the sensor's output signal using a multimeter.

4. Can I continue driving my Scion with the OBDII code C1274 related to the low output signal of the rear speed sensor left?

It is not recommended to drive the vehicle with this code present, as it can affect the performance of the ABS and traction control systems, potentially compromising safety.

5. How can I repair OBDII code C1274 in a Scion due to the low output signal from the rear speed sensor on the left side?

Repair steps may include replacing the rear speed sensor, repairing damaged wiring or connectors, resetting the fault codes, and testing the system to ensure proper functionality.

6. Will resetting the OBDII code C1274 in my Scion fix the issue related to the low output signal of the rear speed sensor left?

Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the low output signal. Proper diagnosis and repair are necessary for a permanent solution.

7. Can weather conditions affect the occurrence of OBDII code C1274 in a Scion due to the low output signal from the rear speed sensor left?

Extreme weather conditions like heavy rain or snow can potentially impact the rear speed sensor's performance and trigger the code. Ensure the sensor and its connections are properly protected.

8. Is it possible to prevent OBDII code C1274 from occurring in my Scion related to the low output signal of the rear speed sensor left?

Regular maintenance and inspection of the ABS and traction control systems can help prevent issues leading to this code. Promptly addressing any warning lights or unusual vehicle behavior is also key.

9. Are there any safety implications associated with OBDII code C1274 in a Scion indicating a low output signal from the rear speed sensor left?

Yes, driving with this code present can affect the vehicle's stability and control systems, potentially compromising safety during braking or cornering maneuvers. It is important to address the issue promptly.

10. How long does it typically take to repair OBDII code C1274 in a Scion caused by the low output signal from the rear speed sensor on the left side?

The repair time can vary depending on the exact cause of the issue and the availability of parts. In general, the repair can take a few hours to complete, but it is advisable to consult a professional technician for an accurate estimate.

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