P1474 2015 GMC Sierra Code - Particulate Matter Sensor Electrode Supply Circuit
Quick Answer
The Particulate Matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. Common causes include Faulty Exhaust Particulate Matter Sensor, Exhaust Particulate Matter Sensor harness is open or shorted, Exhaust Particulate Matter Sensor circuit poor electrical 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
- P1474 2015 GMC Sierra indicates Particulate Matter Sensor Electrode Supply Circuit.
- Common causes
- Common causes include Faulty Exhaust Particulate Matter Sensor, Exhaust Particulate Matter Sensor harness is open or shorted, Exhaust Particulate Matter Sensor circuit poor electrical 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.
Code P1474 2015 GMC Sierra Description
The operation of the PM Sensor is based on the electrical conductivity characteristic of the diesel particulate. As the exhaust gas flows over the sensing element, soot is absorbed in the combs between the electrodes, eventually creating a conductive path. When the path is formed, it generates a current based on the voltage being applied to the element. The measurement process continues until a preset current value is reached. To avoid misleading readings, the sensor performs a regeneration where the soot is cleaned off by heating up the element before the measurement phase begins. The amount of regenerations is based on vehicle strategy; when the calibrated number of regenerations is reached, the cumulative current readings are used to determine the amount of soot concentration in the exhaust gas which in turn determines the collection efficiency of the Diesel Particulate Filter (DPF).
The Diagnostic Trouble Code (DTC) will be set when the particular matter sensor control unit detects a fault in the particulate matter sensor circuitry.
What are the Possible Causes of the DTC P1474 2015 GMC Sierra?
- Faulty Exhaust Particulate Matter Sensor
- Exhaust Particulate Matter Sensor harness is open or shorted
- Exhaust Particulate Matter Sensor circuit poor electrical connection
How to Fix the DTC P1474 2015 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1474 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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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