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Engine-Codes – GMC – C0045 2014 GMC Sierra

C0045 2014 GMC Sierra Code - Left Rear Wheel Speed Sensor Circuit

Quick Answer

The C0045 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the left rear wheel speed sensor circuit. Common causes include Faulty left rear wheel speed sensor, Damaged or corroded wiring connecting the sensor to the ECU, ECU malfunction or software issue. 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
C0045 2014 GMC Sierra indicates Left Rear Wheel Speed Sensor Circuit.
Common causes
Common causes include Faulty left rear wheel speed sensor, Damaged or corroded wiring connecting the sensor to the ECU, ECU malfunction or software issue.
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 11, 2024
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Code C0045 2014 GMC Sierra Description

The C0045 diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to an issue with the left rear wheel speed sensor circuit. The wheel speed sensors are crucial components of the vehicle's anti-lock braking system (ABS) and traction control system. These sensors monitor the rotational speed of each wheel and send this information to the vehicle's electronic control unit (ECU) to help regulate braking and traction.

OBDII Code C0045 2014 GMC Sierra - Left Rear Wheel Speed Sensor Circuit
C0045 2014 GMC Sierra Code - Left Rear Wheel Speed Sensor Circuit

Common Causes of C0045 2014 GMC Sierra

  1. Faulty left rear wheel speed sensor
  2. Damaged or corroded wiring connecting the sensor to the ECU
  3. ECU malfunction or software issue
  4. Physical damage to the sensor or wiring due to road debris or accidents
  5. Poor electrical connections or loose connectors

Symptoms of C0045 2014 GMC Sierra

  1. ABS warning light illuminated on the dashboard
  2. Traction control system malfunctions or engages unexpectedly
  3. Irregular or pulsating brake pedal feel during braking
  4. Decreased overall braking performance
  5. Vehicle stability control system errors

How to Fix C0045 2014 GMC Sierra

  1. Diagnose the issue by using an OBD-II scanner to retrieve the specific trouble code and verify the left rear wheel speed sensor's functionality.
  2. Inspect the sensor and wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Check the wiring harness for any breaks or shorts and repair or replace as needed.
  4. Clear the DTC and test drive the vehicle to ensure the ABS and traction control systems are functioning correctly.
  5. If the issue persists, further diagnosis of the ECU may be required, potentially leading to its replacement.

Cost to Fix C0045 2014 GMC Sierra

The cost of repairing a left rear wheel speed sensor circuit issue can vary depending on the specific cause of the problem and whether any additional repairs or parts replacements are needed. On average, the cost of replacing a wheel speed sensor can range from $100 to $200, including parts and labor. However, if the ECU needs to be replaced, the cost can increase significantly. It's advisable to consult with a certified mechanic or auto repair shop to get a more accurate estimate based on your vehicle's make and model, as well as labor rates in your area. Keep in mind that diagnostic time and labor rates can vary, so it's essential to inquire about these costs upfront.

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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 C0045 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code C0045 in a 2014 GMC Sierra related to the Left Rear Wheel Speed Sensor Circuit?

The common symptoms include the ABS warning light illuminating on the dashboard, traction control system malfunctions, and potential issues with the stability control system.

2. What are the possible causes of OBDII code C0045 in a 2014 GMC Sierra?

The code C0045 in a 2014 GMC Sierra is typically triggered by a faulty left rear wheel speed sensor, damaged wiring or connectors related to the sensor, or issues with the sensor's mounting position.

3. How can I diagnose the OBDII code C0045 in my 2014 GMC Sierra?

Diagnosing OBDII code C0045 involves using a professional OBDII scanner to retrieve the fault codes, inspecting the left rear wheel speed sensor and its wiring for any visible damage, and conducting a thorough visual inspection of the sensor's mounting.

4. Can I still drive my 2014 GMC Sierra with OBDII code C0045 present?

It is not recommended to drive your GMC Sierra with OBDII code C0045 present, as it may affect the proper functioning of the ABS, traction control, and stability control systems, potentially compromising the vehicle's safety.

5. How can I repair OBDII code C0045 in my 2014 GMC Sierra related to the Left Rear Wheel Speed Sensor Circuit?

To repair OBDII code C0045, you may need to replace the left rear wheel speed sensor, repair any damaged wiring or connectors associated with the sensor, and ensure proper mounting and alignment of the new sensor.

6. Are there any DIY tips for troubleshooting OBDII code C0045 in a 2014 GMC Sierra?

While basic visual inspections can be performed by DIY enthusiasts, diagnosing and repairing OBDII code C0045 related to the Left Rear Wheel Speed Sensor Circuit may require specialized tools and expertise, so it is recommended to consult a professional mechanic.

7. How much does it typically cost to fix OBDII code C0045 in a 2014 GMC Sierra at a repair shop?

The cost of fixing OBDII code C0045 in a 2014 GMC Sierra can vary depending on the root cause of the issue, but it generally involves expenses for parts, labor, and diagnostic services, which can range from a few hundred to over a thousand dollars.

8. Is it important to address OBDII code C0045 promptly in my 2014 GMC Sierra?

Yes, it is crucial to address OBDII code C0045 promptly in your 2014 GMC Sierra to ensure the proper functioning of crucial safety systems like ABS, traction control, and stability control, and to maintain the overall safety and performance of your vehicle.

9. Can extreme weather conditions or rough terrain trigger OBDII code C0045 in a 2014 GMC Sierra?

Yes, extreme weather conditions, rough terrain, or driving through harsh environments can potentially damage the left rear wheel speed sensor or its components, leading to the triggering of OBDII code C0045 in a 2014 GMC Sierra.

10. Will resetting the OBDII system clear the code C0045 in my 2014 GMC Sierra?

While resetting the OBDII system may temporarily clear the code C0045, it is important to address the underlying issue causing the fault code to prevent it from reoccurring. A reset should not be considered a permanent solution without proper diagnosis and repair.

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