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Engine-Codes – GMC – C0045 2018 GMC Sierra

C0045 2018 GMC Sierra Code - Left Rear Wheel Speed Sensor Circuit

Quick Answer

The C0045 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the left rear wheel speed sensor circuit. Common causes include Faulty wheel speed sensor, Damaged or corroded sensor wiring, Loose or disconnected sensor connection. 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 2018 GMC Sierra indicates Left Rear Wheel Speed Sensor Circuit.
Common causes
Common causes include Faulty wheel speed sensor, Damaged or corroded sensor wiring, Loose or disconnected sensor connection.
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 15, 2024
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Code C0045 2018 GMC Sierra Description

The C0045 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the left rear wheel speed sensor circuit. The wheel speed sensor is a crucial component of the vehicle's anti-lock braking system (ABS) and traction control system. It is responsible for monitoring the speed of the left rear wheel and sending this information to the vehicle's electronic control module (ECM).

OBDII Code C0045 2018 GMC Sierra - Left Rear Wheel Speed Sensor Circuit
C0045 2018 GMC Sierra Code - Left Rear Wheel Speed Sensor Circuit

Common Causes of C0045 2018 GMC Sierra

  1. Faulty wheel speed sensor
  2. Damaged or corroded sensor wiring
  3. Loose or disconnected sensor connection
  4. Electronic control module (ECM) malfunction
  5. Issues with the tone ring or reluctor ring

Symptoms of C0045 2018 GMC Sierra

  1. ABS light illuminated on the dashboard
  2. Traction control light activated
  3. Erratic or inconsistent braking behavior
  4. Vehicle stability control system malfunctions
  5. Increased stopping distance

How to Fix C0045 2018 GMC Sierra

  1. Diagnose the issue by using a scan tool to retrieve the specific trouble code and inspect the left rear wheel speed sensor and its wiring for any visible damage.
  2. Test the wheel speed sensor using a multimeter to check for proper resistance and voltage output.
  3. Replace the faulty wheel speed sensor if it fails the tests, ensuring proper installation and connection.
  4. Clear the DTC from the ECM memory using the scan tool and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the ECM or wiring harness.

Cost to Fix C0045 2018 GMC Sierra

The cost of repairing a left rear wheel speed sensor circuit issue on a 2018 GMC Sierra can vary depending on the specific cause of the problem and the labor rates in your area. Typically, the cost of a new wheel speed sensor ranges from $50 to $150, while labor costs can range from $100 to $300. Overall, you can expect to pay anywhere from $150 to $450 for parts and labor to address this issue. Keep in mind that diagnostic time and labor rates at auto repair shops can vary, so it's advisable to obtain quotes from multiple sources to ensure a competitive price.

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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 2018 GMC Sierra Code

1. What are common symptoms of OBDII code C0045 on a 2018 GMC Sierra related to the left rear wheel speed sensor circuit?

The common symptoms include the ABS warning light illuminating on the dashboard, potential loss of traction control, and possible activation of the vehicle's stability control system.

2. What are the possible causes of OBDII code C0045 on a 2018 GMC Sierra?

The code C0045 typically indicates a fault in the left rear wheel speed sensor circuit. Possible causes include a faulty wheel speed sensor, damaged wiring or connectors, or issues with the sensor's tone ring.

3. How can I diagnose the OBDII code C0045 on a 2018 GMC Sierra related to the left rear wheel speed sensor circuit?

To diagnose the issue, you can use a diagnostic scanner to retrieve the trouble code, visually inspect the wiring and connectors for damage, test the wheel speed sensor for proper functionality, and check the tone ring for any damage or debris.

4. Can I still drive my 2018 GMC Sierra with OBDII code C0045 related to the left rear wheel speed sensor circuit?

While it is possible to drive the vehicle with this code, it is not recommended as it can affect the performance of the vehicle's ABS and traction control systems. It is best to address the issue promptly to ensure safe operation.

5. How do I repair OBDII code C0045 on a 2018 GMC Sierra related to the left rear wheel speed sensor circuit?

The repair process may involve replacing the left rear wheel speed sensor, repairing any damaged wiring or connectors, cleaning or replacing the tone ring, and clearing the trouble code from the vehicle's system using a diagnostic scanner.

6. Can weather conditions or road debris trigger OBDII code C0045 on a 2018 GMC Sierra?

Yes, extreme weather conditions or road debris can potentially cause issues with the wheel speed sensor or its circuit, leading to the triggering of code C0045. It is important to keep the sensor and its surroundings clean and free of debris.

7. How much does it typically cost to repair OBDII code C0045 on a 2018 GMC Sierra related to the left rear wheel speed sensor circuit?

The cost of repair can vary depending on the specific issue, parts needed, and labor rates. Generally, replacing a wheel speed sensor or repairing wiring may cost a few hundred dollars, but it's best to consult a mechanic for an accurate estimate.

8. Are there any DIY tips for troubleshooting OBDII code C0045 on a 2018 GMC Sierra?

While basic visual inspections and cleaning of connectors can be done by DIY enthusiasts, diagnosing and repairing issues related to the wheel speed sensor circuit may require specialized tools and expertise. It is recommended to seek professional help for accurate diagnosis and repair.

9. How urgent is it to address OBDII code C0045 on a 2018 GMC Sierra related to the left rear wheel speed sensor circuit?

While the vehicle may still be operable with this code present, it is important to address it promptly to ensure the proper functioning of the ABS and traction control systems. Ignoring the issue can potentially compromise the safety and performance of the vehicle.

10. Can OBDII code C0045 on a 2018 GMC Sierra be a false alarm?

While it is possible for a trouble code to be triggered erroneously, OBDII code C0045 typically indicates a genuine issue with the left rear wheel speed sensor circuit. It is recommended to perform thorough diagnostics to confirm the root cause before proceeding with any repairs.

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