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Engine-Codes – GMC – C0047 GMC

C0047 GMC Code - Left Rear Wheel Speed Sensor Circuit Low

Quick Answer

The C0047 GMC code indicates a problem with the left rear wheel speed sensor circuit being lower than expected. Common causes include Faulty left rear wheel speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris affecting sensor readings. 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
C0047 GMC indicates Left Rear Wheel Speed Sensor Circuit Low.
Common causes
Common causes include Faulty left rear wheel speed sensor, Damaged wiring or connectors in the sensor circuit, Corrosion or debris affecting sensor readings.
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 12, 2024
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Code C0047 GMC Description

The C0047 GMC code indicates a problem with the left rear wheel speed sensor circuit being lower than expected. This sensor plays a crucial role in the vehicle's anti-lock braking system (ABS) and traction control system. The wheel speed sensor measures the rotational speed of the wheel and sends this information to the vehicle's electronic control module (ECM). If the sensor detects a low signal or no signal at all, it can lead to issues with the ABS and traction control systems, affecting the vehicle's ability to brake effectively and maintain traction on the road.

OBDII Code C0047 GMC - Left Rear Wheel Speed Sensor Circuit Low
C0047 GMC Code - Left Rear Wheel Speed Sensor Circuit Low

Common Causes of C0047 GMC

  1. Faulty left rear wheel speed sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Corrosion or debris affecting sensor readings
  4. ECM malfunction or software issue
  5. Physical damage to the sensor or wheel bearing

Symptoms of C0047 GMC

  1. Illumination of the ABS warning light on the dashboard
  2. Traction control system engaging unexpectedly or not functioning properly
  3. Increased stopping distance when applying brakes
  4. Vehicle pulling to one side while braking
  5. Grinding or clicking noise coming from the wheel area

How to Fix C0047 GMC

  1. Begin by diagnosing the issue using a diagnostic scanner to retrieve the specific fault codes and pinpoint the problem with the left rear wheel speed sensor circuit.
  2. Inspect the sensor, wiring, and connectors for any visible damage, corrosion, or loose connections. Replace any damaged components as needed.
  3. Test the sensor's resistance and output voltage to ensure it is functioning within specifications. Replace the sensor if it fails the tests.
  4. Clear the fault codes from the ECM and perform a road test to verify that the ABS and traction control systems are operating correctly.
  5. If the issue persists, further troubleshooting may be required to identify any underlying issues with the ECM or other related components.

Cost to Fix C0047 GMC

The typical repair costs for addressing a C0047 GMC code related to the left rear wheel speed sensor circuit low can range from $100 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to check local rates for a more accurate estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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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 C0047 GMC Code

1. What are the common symptoms of OBDII code C0047 GMC (Left Rear Wheel Speed Sensor Circuit Low)?

The common symptoms include the ABS light coming on, traction control system malfunction, and potential loss of stability control.

2. What are the possible causes of the C0047 GMC code?

Possible causes may include a faulty left rear wheel speed sensor, damaged sensor wiring or connectors, wheel speed sensor ring damage, or issues with the ABS module.

3. How can I diagnose the cause of the C0047 GMC code?

Diagnosis typically involves visually inspecting the sensor and wiring for damage, checking the sensor's resistance with a multimeter, and performing a scan tool test to monitor wheel speed sensor data.

4. What are some repair tips for resolving the C0047 GMC code?

Repair tips may include cleaning the sensor mounting surface, repairing or replacing damaged wiring or connectors, replacing the faulty wheel speed sensor, and ensuring proper installation and calibration.

5. Can I drive my vehicle with the C0047 GMC code present?

It is not recommended to drive with this code present, as it may affect the proper functioning of the ABS and stability control systems, potentially compromising vehicle safety.

6. How do I reset the C0047 GMC code after making repairs?

After addressing the underlying issue, you can reset the code using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the stored fault codes.

7. Will the C0047 GMC code cause any damage to my vehicle if left unresolved?

Leaving the code unresolved may lead to further issues with the ABS and stability control systems, potentially affecting the vehicle's braking performance and overall safety.

8. Is it possible for the C0047 GMC code to reappear after repairs have been made?

If the root cause of the code was not properly addressed, or if there are underlying issues with the ABS system, the code may reappear even after repairs.

9. Do I need specialized tools to fix the C0047 GMC code myself?

While basic tools like a multimeter and OBDII scanner can be helpful for diagnosis and resetting the code, specialized tools may be required for more in-depth troubleshooting and repairs.

10. How can I prevent the C0047 GMC code from recurring in the future?

Regularly inspecting and maintaining the wheel speed sensors, sensor wiring, and ABS system components can help prevent the recurrence of the C0047 code.

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