AutoCodes – Generic – C1274

C1274 Code - Low Output Signal of Rear Speed Sensor Left

Quick Answer

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU (Brake Actuator Assembly). Common causes include Faulty Rear Speed Sensor Left (Rear Axle Hub and Bearing Assembly Left), Rear Speed Sensor Left Rotor (Rear Axle Hub and Bearing Assembly Left), Rear Speed Sensor Left harness is open or shorted. 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 indicates Low Output Signal of Rear Speed Sensor Left.
Common causes: Common causes include Faulty Rear Speed Sensor Left (Rear Axle Hub and Bearing Assembly Left), Rear Speed Sensor Left Rotor (Rear Axle Hub and Bearing Assembly Left), Rear Speed Sensor Left harness is open or shorted.
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.

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Code Popularity 12,422

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 19, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1274 Description

The speed sensor detects the wheel speed and sends the appropriate signals to the Skid Control ECU (Brake Actuator Assembly). These signals are used for Anti-Lock Brake System (ABS) control. Speed sensor rotors have rows of alternating N and S magnetic poles, and their magnetic fields change when the rotors turn. Each speed sensor detects that magnetic change and sends a pulse signal to the Skid Control ECU (Brake Actuator Assembly).

OBDII Code C1274 - Low Output Signal of Rear Speed Sensor Left - AutoCodes.com — C1274 Code - Low Output Signal of Rear Speed Sensor Left

What does this mean?

What are the Possible Causes of the DTC C1274?

Faulty Rear Speed Sensor Left (Rear Axle Hub and Bearing Assembly Left)
Rear Speed Sensor Left Rotor (Rear Axle Hub and Bearing Assembly Left)
Rear Speed Sensor Left harness is open or shorted
Rear Speed Sensor Left circuit poor electrical connection

How to Fix the DTC C1274?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1274 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the C1274 code?

Need more information on how to fix the C1274 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1274 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1274 Hyundai — G-Sensor Error
C1274 KIA — G-Sensor Error
C1274 Lexus — Low Output Signal of Rear Speed Sensor Left
C1274 Scion — Low Output Signal of Rear Speed Sensor Left
C1274 Toyota — Low Output Signal of Rear Speed Sensor Left

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 Code

1. What are common symptoms of OBDII code C1274 (Low Output Signal of Rear Speed Sensor Left)?

- Common symptoms include the ABS light turning on, traction control issues, and potential difficulty in braking.

2. What are the possible causes of OBDII code C1274?

- Possible causes include a faulty rear speed sensor on the left side, damaged wiring or connectors, or issues with the ABS module.

3. How can I diagnose the cause of OBDII code C1274?

- Diagnosis typically involves checking the rear speed sensor on the left side for proper operation, inspecting wiring and connectors for damage, and using a scan tool to retrieve additional diagnostic information.

4. Can I continue driving with OBDII code C1274 present?

- It is not recommended to continue driving with this code present, as it can affect the proper functioning of the ABS system and compromise vehicle safety.

5. How can I repair OBDII code C1274?

- Repairing this code involves replacing the faulty rear speed sensor on the left side, repairing any damaged wiring or connectors, and clearing the code with a scan tool.

6. Is it possible to reset OBDII code C1274 without fixing the underlying issue?

- While you can clear the code temporarily with a scan tool, it is important to address the underlying issue to prevent the code from reoccurring and ensure the proper functioning of the ABS system.

7. Can extreme weather conditions trigger OBDII code C1274?

- Extreme weather conditions can potentially exacerbate existing issues related to the rear speed sensor or wiring, leading to the triggering of OBDII code C1274.

8. How do I prevent OBDII code C1274 from recurring in the future?

- To prevent the recurrence of this code, it is essential to maintain proper maintenance of the ABS system, regularly inspect sensors and wiring for any signs of damage, and address any issues promptly.

9. Are there any safety concerns associated with OBDII code C1274?

- Yes, there are safety concerns associated with this code, as it can impact the proper functioning of the ABS system, potentially affecting braking performance and vehicle stability.

10. Can a DIY enthusiast repair OBDII code C1274, or is professional help recommended?

- While some DIY enthusiasts may be able to repair this code by replacing the rear speed sensor or addressing wiring issues, professional help is recommended for proper diagnosis and repair, especially if unfamiliar with ABS systems.