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Engine-Codes – GMC – C0045 2017 GMC Sierra

C0045 2017 GMC Sierra Code - Left Rear Wheel Speed Sensor Circuit

Quick Answer

The C0045 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the left rear wheel speed sensor circuit. Common causes include Damaged or worn wheel speed sensor, Corrosion or debris affecting sensor operation, Faulty wiring or connections in the sensor circuit. 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 2017 GMC Sierra indicates Left Rear Wheel Speed Sensor Circuit.
Common causes
Common causes include Damaged or worn wheel speed sensor, Corrosion or debris affecting sensor operation, Faulty wiring or connections in the sensor circuit.
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 14, 2024
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Code C0045 2017 GMC Sierra Description

The C0045 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the left rear wheel speed sensor circuit. This code indicates that there is a malfunction in the circuit that is responsible for monitoring the speed of the left rear wheel. The wheel speed sensors are crucial components of the vehicle's anti-lock braking system (ABS) and traction control system. They provide real-time data on the speed of each wheel to the vehicle's electronic control unit (ECU), allowing the system to adjust braking pressure and traction as needed.

OBDII Code C0045 2017 GMC Sierra - Left Rear Wheel Speed Sensor Circuit
C0045 2017 GMC Sierra Code - Left Rear Wheel Speed Sensor Circuit

Common Causes of C0045 2017 GMC Sierra

  1. Damaged or worn wheel speed sensor
  2. Corrosion or debris affecting sensor operation
  3. Faulty wiring or connections in the sensor circuit
  4. Issues with the ECU or ABS module
  5. Mechanical damage to the wheel bearing or hub assembly

Symptoms of C0045 2017 GMC Sierra

  1. Illumination of the ABS warning light on the dashboard
  2. Traction control system malfunction indicator
  3. Erratic or inconsistent ABS activation during braking
  4. Increased stopping distances
  5. Loss of traction on slippery surfaces

How to Fix C0045 2017 GMC Sierra

  1. Begin by diagnosing the specific cause of the C0045 DTC using a scan tool to pinpoint the exact issue with the left rear wheel speed sensor circuit.
  2. Inspect the wheel speed sensor and its wiring for any signs of damage, corrosion, or debris. Clean or replace the sensor as needed.
  3. Check the connections and wiring leading to the sensor for any breaks, shorts, or loose connections. Repair or replace damaged wiring.
  4. Test the sensor circuit and related components to ensure proper operation and communication with the ECU.
  5. Clear the DTC from the vehicle's memory using the scan tool and perform a test drive to verify that the issue has been resolved.

Cost to Fix C0045 2017 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 the extent of the repairs needed. In general, replacing a wheel speed sensor can range from $100 to $200, while addressing wiring or connection issues may add to the total cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, so the total repair cost can vary based on the shop's rates and the time required for diagnosis and repair. It's recommended to obtain a detailed estimate from a qualified mechanic to get a more accurate cost projection for this repair.

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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 2017 GMC Sierra Code

1. What are common symptoms of OBDII code C0045 on a 2017 GMC Sierra related to the Left Rear Wheel Speed Sensor Circuit?

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

2. What are the possible causes of OBDII code C0045 on a 2017 GMC Sierra?

Possible causes of this code include a faulty left rear wheel speed sensor, damaged wiring or connectors in the circuit, a failed ABS module, or issues with the wheel speed sensor tone ring.

3. How can I diagnose the OBDII code C0045 on my 2017 GMC Sierra?

To diagnose this code, you can use an OBDII scanner to retrieve the specific fault code. Additionally, inspect the left rear wheel speed sensor, check the wiring and connectors for damage, and perform a visual inspection of the tone ring for any issues.

4. Can I continue driving my 2017 GMC Sierra with OBDII code C0045 present?

While the vehicle may still be operable with this code, it is not recommended to ignore it. It is important to address the underlying issue promptly to ensure the proper functioning of the ABS and traction control systems.

5. How can I repair OBDII code C0045 on my 2017 GMC Sierra?

Repair options may include replacing the left rear wheel speed sensor, repairing or replacing damaged wiring or connectors, addressing any issues with the wheel speed sensor tone ring, or replacing the ABS module if necessary.

6. Are there any DIY tips for troubleshooting OBDII code C0045 on a 2017 GMC Sierra?

DIY tips may include checking for visible damage to the sensor and its wiring, ensuring proper connections, and inspecting the tone ring for debris or damage. However, complex diagnostics and repairs may require professional assistance.

7. Will OBDII code C0045 on a 2017 GMC Sierra affect vehicle performance?

While the code itself may not significantly impact performance, it can compromise the functionality of the ABS and traction control systems, affecting overall safety and stability during driving.

8. How long does it typically take to repair OBDII code C0045 on a 2017 GMC Sierra?

The repair time can vary depending on the exact cause of the code and the extent of the repairs needed. Simple fixes like sensor replacement may take less time, while complex issues could require more labor.

9. Can extreme weather conditions affect the occurrence of OBDII code C0045 on a 2017 GMC Sierra?

Extreme weather conditions, especially those causing moisture or corrosion, can potentially impact the wheel speed sensor circuit and lead to the triggering of this fault code.

10. Is it necessary to reset the OBDII system after repairing code C0045 on a 2017 GMC Sierra?

After completing the repairs, it is advisable to clear the OBDII system's memory using an OBDII scanner to reset the code and ensure proper functioning of the ABS and traction control systems.

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