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Engine-Codes – GMC – P1474 2014 GMC Sierra

P1474 2014 GMC Sierra Code - Particulate Matter Sensor Electrode Supply Circuit

Quick Answer

The P1474 diagnostic trouble code (DTC) on a 2014 GMC Sierra relates to the Particulate Matter Sensor Electrode Supply Circuit. Common causes include Faulty Wiring: Damaged or corroded wiring in the electrode supply circuit can disrupt the power flow to the sensor, Loose Connections: Loose or poor connections at the sensor, connectors, or other components can cause intermittent power supply issues, Blown Fuse: A blown fuse in the circuit can prevent power from reaching the sensor. 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 2014 GMC Sierra indicates Particulate Matter Sensor Electrode Supply Circuit.
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring in the electrode supply circuit can disrupt the power flow to the sensor, Loose Connections: Loose or poor connections at the sensor, connectors, or other components can cause intermittent power supply issues, Blown Fuse: A blown fuse in the circuit can prevent power from reaching the sensor.
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 18, 2024
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Code P1474 2014 GMC Sierra Description

The P1474 diagnostic trouble code (DTC) on a 2014 GMC Sierra relates to the Particulate Matter Sensor Electrode Supply Circuit. This code indicates an issue with the circuit responsible for supplying power to the particulate matter sensor in the vehicle's exhaust system. The particulate matter sensor is a crucial component in modern diesel engines, as it helps monitor and control the amount of harmful emissions released into the environment.

OBDII Code P1474 2014 GMC Sierra - Particulate Matter Sensor Electrode Supply Circuit
P1474 2014 GMC Sierra Code - Particulate Matter Sensor Electrode Supply Circuit

Common Causes of P1474 2014 GMC Sierra

  1. Faulty Wiring: Damaged or corroded wiring in the electrode supply circuit can disrupt the power flow to the sensor.
  2. Loose Connections: Loose or poor connections at the sensor, connectors, or other components can cause intermittent power supply issues.
  3. Blown Fuse: A blown fuse in the circuit can prevent power from reaching the sensor.
  4. Sensor Failure: The particulate matter sensor itself may be faulty and require replacement.
  5. ECM/PCM Issues: Problems with the Engine Control Module (ECM) or Powertrain Control Module (PCM) can also trigger the P1474 code.

Symptoms of P1474 2014 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 Engine Performance: Drivers may experience a decrease in engine power, acceleration, or overall performance.
  3. Increased Emissions: The vehicle may produce higher levels of emissions than usual, potentially failing emissions tests.
  4. Poor Fuel Efficiency: A malfunctioning particulate matter sensor can lead to decreased fuel efficiency, resulting in more frequent refueling.
  5. Rough Idling or Stalling: In some cases, the engine may idle roughly or even stall due to the inaccurate sensor readings.

How to Fix P1474 2014 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the trouble codes and pinpoint the exact cause of the problem.
  2. Inspect Wiring and Connections: Check the wiring harness, connectors, and sensor for any damage, corrosion, or loose connections.
  3. Test Fuses and Relays: Verify the integrity of the fuses and relays related to the electrode supply circuit.
  4. Replace Sensor: If the sensor is determined to be faulty, replace it with a new one.
  5. Clear Codes and Test: After completing the repairs, clear the trouble codes from the ECM/PCM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1474 2014 GMC Sierra

The typical repair costs for addressing a P1474 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty particulate matter sensor or repairing wiring/connectors can range from $200 to $500, including parts and labor. However, if additional components need replacement or if extensive diagnostics are required, the cost may increase.

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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 2014 GMC Sierra Code

1. What does the OBDII code P1474 mean for a 2014 GMC Sierra?

P1474 indicates an issue with the Particulate Matter Sensor Electrode Supply Circuit, which monitors emissions by detecting soot levels in the exhaust system.

2. What are the common symptoms of code P1474 in a 2014 GMC Sierra?

Common symptoms include an illuminated check engine light, reduced engine performance, increased exhaust emissions, and possible difficulty passing emissions tests.

3. What causes the P1474 fault code in a GMC Sierra?

Causes can include a faulty particulate matter sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning powertrain control module (PCM).

4. Can driving with code P1474 damage my 2014 GMC Sierra?

Driving with this code may increase emissions and lead to long-term damage to the exhaust system if not addressed, but it typically doesn't cause immediate engine damage.

5. How do I diagnose the P1474 code on a 2014 GMC Sierra?

Diagnosis involves checking the particulate matter sensor, inspecting the wiring and connectors for damage, and using a scan tool to monitor sensor data and pinpoint the issue.

6. How can I fix the P1474 code on my 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. How much does it cost to repair the P1474 code on a 2014 GMC Sierra?

Repair costs vary, but replacing the particulate matter sensor typically ranges from $300 to $600, depending on labor rates and parts pricing.

8. Can a dirty exhaust system cause the P1474 code?

Yes, excessive soot buildup in the exhaust system can affect the accuracy of the particulate matter sensor and trigger the P1474 code.

9. Is the P1474 code covered under warranty for a 2014 GMC Sierra?

It may be covered under the emissions warranty, depending on your vehicle's mileage and specific warranty terms. Contact your dealer to confirm.

10. Can I clear the P1474 code by disconnecting the battery?

Disconnecting the battery may temporarily clear the code, but it won’t fix the underlying issue. The code will likely return until the problem is properly addressed.

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