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P1474 2015 GMC Sierra Code - Particulate Matter Sensor Electrode Supply Circuit

Quick Answer

The P1474 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Particulate Matter Sensor Electrode Supply Circuit. Common causes include Wiring Harness Issues: Damage or corrosion in the wiring harness connecting the particulate matter sensor to the ECM can cause the P1474 code, Faulty Sensor: A malfunctioning particulate matter sensor itself can trigger this code, ECM Malfunction: Problems with the electronic control module (ECM) that controls the sensor could also be a cause. 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
P1474 2015 GMC Sierra indicates Particulate Matter Sensor Electrode Supply Circuit.
Common causes
Common causes include Wiring Harness Issues: Damage or corrosion in the wiring harness connecting the particulate matter sensor to the ECM can cause the P1474 code, Faulty Sensor: A malfunctioning particulate matter sensor itself can trigger this code, ECM Malfunction: Problems with the electronic control module (ECM) that controls the sensor could also be a cause.
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 13, 2024
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Code P1474 2015 GMC Sierra Description

The P1474 diagnostic trouble code (DTC) for a 2015 GMC Sierra relates to the Particulate Matter Sensor Electrode Supply Circuit. This code indicates a problem with the circuit that supplies power to the particulate matter sensor in the vehicle's exhaust system. The particulate matter sensor is responsible for monitoring the amount of soot or particulate matter emitted by the diesel engine. This information is crucial for the vehicle's emissions control system to function properly.

OBDII Code P1474 2015 GMC Sierra - Particulate Matter Sensor Electrode Supply Circuit
P1474 2015 GMC Sierra Code - Particulate Matter Sensor Electrode Supply Circuit

Common Causes of P1474 2015 GMC Sierra

  1. Wiring Harness Issues: Damage or corrosion in the wiring harness connecting the particulate matter sensor to the ECM can cause the P1474 code.
  2. Faulty Sensor: A malfunctioning particulate matter sensor itself can trigger this code.
  3. ECM Malfunction: Problems with the electronic control module (ECM) that controls the sensor could also be a cause.
  4. Poor Electrical Connection: Loose or poor electrical connections related to the sensor circuit can lead to the P1474 code.

Symptoms of P1474 2015 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the P1474 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A faulty particulate matter sensor can lead to decreased fuel efficiency as the engine may not be operating at optimal levels.
  3. Increased Emissions: The vehicle may produce higher levels of harmful emissions if the particulate matter sensor is not functioning correctly.
  4. Engine Performance Issues: In some cases, the vehicle may experience rough idling, hesitation, or a lack of power due to the faulty sensor.

How to Fix P1474 2015 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble code and perform further testing to identify the exact cause of the problem.
  2. Inspect Wiring Harness: Check the wiring harness for any signs of damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test Sensor Functionality: Test the particulate matter sensor to determine if it is functioning correctly. Replace if necessary.
  4. Check ECM: Inspect the electronic control module for any faults or malfunctions. Repair or replace as required.
  5. Clear Codes and Test Drive: After completing the repairs, clear the trouble codes from the vehicle's ECM and test drive to ensure the issue has been resolved.

Cost to Fix P1474 2015 GMC Sierra

The cost of repairing a P1474 code on a 2015 GMC Sierra can vary depending on the exact cause of the issue and the cost of parts and labor in your area. On average, you can expect to pay anywhere from $200 to $500 for parts and labor. However, it's important to note that diagnostic time and labor rates at auto repair shops can vary significantly. It's recommended to obtain quotes from multiple shops to get a more accurate estimate based on your specific location and vehicle. Keep in mind that rates at dealerships or in metropolitan areas may be higher, while independent shops may offer more competitive pricing.

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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 P1474 2015 GMC Sierra Code

1. What does the OBDII code P1474 mean on a 2015 GMC Sierra?

Code P1474 indicates an issue with the Particulate Matter Sensor Electrode Supply Circuit, which monitors the exhaust's particulate matter levels as part of the emissions system.

2. What are the common symptoms of code P1474 in a 2015 GMC Sierra?

Typical symptoms include the check engine light turning on, reduced engine performance, poor fuel efficiency, and, in some cases, visible black smoke from the exhaust.

3. What causes the P1474 code to appear on a 2015 GMC Sierra?

Common causes include a faulty particulate matter sensor, damaged wiring or connectors in the sensor circuit, or issues with the vehicle’s powertrain control module (PCM).

4. Can I drive my 2015 GMC Sierra with a P1474 code?

While it may be possible to drive the vehicle, operating it with this code can lead to increased emissions, potential engine damage over time, and reduced performance. Prompt diagnosis and repair are recommended.

5. How do I diagnose the P1474 code on my 2015 GMC Sierra?

Diagnosis typically involves inspecting the particulate matter sensor, checking for damaged wiring or loose connections, and using a scan tool to monitor sensor data and confirm the fault.

6. How can the P1474 code be fixed on a 2015 GMC Sierra?

Repairs may include replacing the particulate matter sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. What tools do I need to troubleshoot a P1474 code?

You’ll need an OBDII scanner to retrieve and monitor codes, a multimeter to test electrical circuits, and potentially a wiring diagram for your vehicle.

8. Is the P1474 code covered under warranty for a 2015 GMC Sierra?

It may be covered under the emissions system warranty, depending on the mileage and age of the vehicle. Check with your dealership or warranty documentation for specifics.

9. How much does it cost to fix the P1474 code on a 2015 GMC Sierra?

Repair costs can vary but typically range from $200 to $600, depending on whether the sensor or wiring needs replacement and labor costs in your area.

10. Can a dirty particulate matter sensor trigger the P1474 code?

Yes, a contaminated or clogged sensor can cause improper readings, potentially triggering the P1474 code. Cleaning or replacing the sensor may resolve the issue.

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