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Engine-Codes – GMC – C1227 GMC

C1227 GMC Code - Left Rear Excessive Wheel Speed Variation

Quick Answer

The C1227 GMC code indicates that there is excessive wheel speed variation detected in the left rear wheel of the vehicle. Common causes include Faulty left rear wheel speed sensor, Damaged tone ring on the left rear wheel, Corroded or damaged wiring/connectors leading to the left rear wheel speed sensor. 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
C1227 GMC indicates Left Rear Excessive Wheel Speed Variation.
Common causes
Common causes include Faulty left rear wheel speed sensor, Damaged tone ring on the left rear wheel, Corroded or damaged wiring/connectors leading to the left rear wheel speed sensor.
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 09, 2024
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Code C1227 GMC Description

The C1227 GMC code indicates that there is excessive wheel speed variation detected in the left rear wheel of the vehicle. This can be a serious issue as it can affect the vehicle's stability, handling, and overall performance. The Anti-lock Braking System (ABS) and Traction Control System (TCS) rely on accurate wheel speed data to function properly. When there is a significant difference in wheel speed between the left rear wheel and the other wheels, it can trigger this code.

OBDII Code C1227 GMC - Left Rear Excessive Wheel Speed Variation
C1227 GMC Code - Left Rear Excessive Wheel Speed Variation

Common Causes of C1227 GMC

  1. Faulty left rear wheel speed sensor
  2. Damaged tone ring on the left rear wheel
  3. Corroded or damaged wiring/connectors leading to the left rear wheel speed sensor
  4. Wheel bearing issues affecting the left rear wheel
  5. Electronic control module (ECM) malfunction

Symptoms of C1227 GMC

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunction indicator
  3. Uneven braking or pulling to one side during braking
  4. Increased stopping distance
  5. Abnormal noises coming from the left rear wheel area

How to Fix C1227 GMC

  1. Begin by connecting a diagnostic scanner to retrieve the specific error codes and confirm the diagnosis.
  2. Inspect the left rear wheel speed sensor, tone ring, wiring, and connectors for any visible damage or corrosion. Replace any faulty components as necessary.
  3. Test the wheel speed sensor using a multimeter to ensure it is sending accurate signals.
  4. Clear the error codes from the vehicle's system and perform a test drive to confirm that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to check for underlying issues such as a faulty ECM or wheel bearing problems.

Cost to Fix C1227 GMC

The typical repair costs for addressing a left rear excessive wheel speed variation issue can vary depending on the specific cause of the problem and the extent of the repairs needed. On average, the cost of replacing a wheel speed sensor can range from $100 to $300, while fixing damaged wiring or connectors may cost around $50 to $150. If the tone ring needs replacement, the cost can be between $150 to $250. Labor costs can add another $80 to $150 per hour, and the total repair bill can range from $200 to $600 or more, depending on the severity of the issue and the parts needed. It's important to consult with a professional mechanic to get an accurate estimate based on your vehicle's make and model.

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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 C1227 GMC Code

1. What are the common symptoms of OBDII code C1227 GMC?

- Common symptoms include the ABS light being illuminated on the dashboard, traction control issues, and potential wheel speed sensor malfunction.

2. What could cause the OBDII code C1227 GMC to trigger?

- The code may be triggered by a faulty left rear wheel speed sensor, damaged wiring, or a problem with the ABS control module.

3. How can I diagnose the cause of OBDII code C1227 GMC at home?

- You can start by visually inspecting the left rear wheel speed sensor and its wiring for any damage. You can also use a diagnostic scanner to retrieve specific fault codes.

4. Is it safe to drive with OBDII code C1227 GMC present?

- It is not recommended to drive with this code present, as it can affect the vehicle's traction control and ABS system, potentially compromising your safety.

5. Can I reset the OBDII code C1227 GMC by disconnecting the battery?

- Disconnecting the battery may temporarily clear the code, but it is not a permanent solution. It is best to diagnose and repair the underlying issue causing the code.

6. How much does it typically cost to repair OBDII code C1227 GMC?

- The cost of repair can vary depending on the exact cause of the code, but it may involve replacing the left rear wheel speed sensor, repairing damaged wiring, or addressing issues with the ABS control module.

7. Can a DIY enthusiast repair OBDII code C1227 GMC themselves?

- Depending on your level of automotive expertise, you may be able to replace the left rear wheel speed sensor or address wiring issues yourself. However, complex ABS system repairs may require professional help.

8. Will OBDII code C1227 GMC cause my vehicle to fail an emissions test?

- This code is related to the ABS system and is unlikely to cause your vehicle to fail an emissions test. However, it is still important to address the issue promptly for safety reasons.

9. How long does it take to repair OBDII code C1227 GMC?

- The repair time can vary depending on the exact cause of the code and the availability of parts. In general, it may take a few hours to a full day to diagnose and repair the issue.

10. Can OBDII code C1227 GMC affect other systems in my vehicle?

- Yes, this code can affect the operation of the ABS system and traction control, potentially impacting the overall stability and safety of your vehicle.

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