AutoCodes – Generic – C1276

C1276 Code - Abnormal Change in Output Signal of Front Left Speed Sensor

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 Front Speed Sensor Left, Front Speed Sensor Left Rotor (Front Axle Hub Sub-Assembly Left), Front 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: C1276 indicates Abnormal Change in Output Signal of Front Left Speed Sensor.
Common causes: Common causes include Faulty Front Speed Sensor Left, Front Speed Sensor Left Rotor (Front Axle Hub Sub-Assembly Left), Front 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 13,837

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 20, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C1276 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 C1276 - Abnormal Change in Output Signal of Front Left Speed Sensor - AutoCodes.com — C1276 Code - Abnormal Change in Output Signal of Front Left Speed Sensor

What does this mean?

What are the Possible Causes of the DTC C1276?

Faulty Front Speed Sensor Left
Front Speed Sensor Left Rotor (Front Axle Hub Sub-Assembly Left)
Front Speed Sensor Left harness is open or shorted
Front Speed Sensor Left circuit poor electrical connection

How to Fix the DTC C1276?

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

If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
If there is iron powder sticking to the rotor, this will result in a malfunction, so confirm that the rotor is not contaminated with foreign material before replacing the sensor.
Check the speed sensor signal after cleaning or replacement.
On most vehicles, the Front Speed Sensor Rotor is incorporated into the Front Axle Hub Sub-Assembly. If the Speed Sensor Rotor needs to be replaced, replace it together with the Front Axle Hub Sub-Assembly.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1276 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.

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Information for Specific Makes

C1276 Buick — Right Front TCS Prime Valve Malfunction
C1276 Cadillac — Right Front TCS Prime Valve Malfunction
C1276 Chevrolet — Right Front TCS Prime Valve Malfunction
C1276 GMC — Right Front TCS Prime Valve Malfunction
C1276 Lexus — Abnormal Change in Output Signal of Front Left Speed Sensor
C1276 Pontiac — Right Front TCS Prime Valve Malfunction
C1276 Scion — Abnormal Change in Output Signal of Front Left Speed Sensor
C1276 Toyota — Abnormal Change in Output Signal of Front Left Speed Sensor

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 C1276 Code

1. What are common symptoms of OBDII code C1276 related to the front left speed sensor?

- Common symptoms include ABS warning light illuminated on the dashboard, traction control issues, and potential loss of stability control.

2. What are the possible causes of OBDII code C1276 indicating an abnormal change in the output signal of the front left speed sensor?

- Possible causes include a faulty front left wheel speed sensor, damaged wiring or connectors, sensor misalignment, or issues with the ABS control module.

3. How can I diagnose the issue causing OBDII code C1276 to appear for the front left speed sensor?

- Diagnosis involves inspecting the front left speed sensor and its wiring for any visible damage, testing the sensor's output signal, and checking the ABS control module for faults.

4. Can driving with OBDII code C1276 present cause any safety concerns?

- Yes, driving with this code active can affect the proper functioning of the ABS system, traction control, and stability control, potentially compromising vehicle safety.

5. What are some recommended repair tips for addressing OBDII code C1276 related to the front left speed sensor issue?

- Repair tips include replacing the front left speed sensor if faulty, repairing damaged wiring or connectors, ensuring proper sensor alignment, and diagnosing any ABS control module problems.

6. Is it possible to reset OBDII code C1276 after addressing the front left speed sensor issue?

- Yes, after repairing or replacing the front left speed sensor and addressing any related problems, the code can be cleared using an OBDII scanner to reset the system.

7. How urgent is it to address OBDII code C1276 linked to the abnormal change in the front left speed sensor output signal?

- It is recommended to address this code promptly to ensure the proper functioning of ABS, traction control, and stability control systems for safe driving.

8. Can extreme weather conditions or driving off-road contribute to triggering OBDII code C1276 for the front left speed sensor?

- Yes, extreme conditions or off-road driving can expose the front left speed sensor to potential damage or misalignment, leading to the code being triggered.

9. Are there any DIY steps I can take to troubleshoot OBDII code C1276 before seeking professional help?

- DIY steps include visually inspecting the front left speed sensor and its wiring, checking for loose connections, and ensuring the sensor is properly aligned before seeking professional assistance.

10. How can regular maintenance help prevent issues with the front left speed sensor triggering OBDII code C1276?

- Regular maintenance, including inspecting the speed sensor during routine checks and addressing any signs of wear or damage early on, can help prevent issues leading to the code's activation.