P1479 2015 GMC Sierra Code - Particulate Matter Sensor Sensitivity Factor Performance
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
- P1479 2015 GMC Sierra indicates Particulate Matter Sensor Sensitivity Factor Performance.
- 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 P1479 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 P1479 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 P1479 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 P1479 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 P1479 2015 GMC Sierra Code
1. What does the OBDII code P1479 mean on a 2015 GMC Sierra?
P1479 indicates an issue with the sensitivity factor performance of the particulate matter sensor, which monitors soot levels in the exhaust system.
2. What are the common symptoms of code P1479 on a 2015 GMC Sierra?
Symptoms may include reduced engine performance, increased exhaust emissions, a check engine light, or issues with the diesel particulate filter (DPF) regeneration process.
3. What causes OBDII code P1479 in a GMC Sierra?
Common causes include a faulty particulate matter sensor, sensor wiring issues, exhaust leaks, or excessive soot accumulation in the exhaust system.
4. Can a dirty particulate matter sensor cause code P1479?
Yes, a dirty or clogged particulate matter sensor can cause inaccurate readings, leading to the P1479 code.
5. How do I diagnose code P1479 on a 2015 GMC Sierra?
Diagnosis involves using a scan tool to confirm the code, inspecting the particulate matter sensor and its wiring, and checking for soot buildup or exhaust leaks.
6. Is it safe to drive with the P1479 code on a GMC Sierra?
Driving with this code is not recommended, as it may indicate issues with the DPF system, potentially leading to engine damage or increased emissions.
7. How do I fix OBDII code P1479 on my 2015 GMC Sierra?
Repairs may include cleaning or replacing the particulate matter sensor, repairing wiring or connector issues, and addressing any soot buildup or exhaust leaks.
8. How much does it cost to fix code P1479 on a GMC Sierra?
The cost depends on the specific issue but typically ranges from $200 to $600, including diagnosing and replacing the particulate matter sensor if needed.
9. Can I clear code P1479 without fixing the problem?
Clearing the code without addressing the underlying issue will only result in the code returning and potentially worsening the problem.
10. Is the P1479 code related to the DPF system?
Yes, the particulate matter sensor plays a critical role in the DPF system by monitoring soot levels to trigger regeneration cycles.
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