P147B 2015 GMC Sierra Code - Particulate Matter Sensor Shunt Circuit High Current
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
- P147B 2015 GMC Sierra indicates Particulate Matter Sensor Shunt Circuit High Current.
- 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 P147B 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 P147B 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 P147B 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 P147B 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 P147B 2015 GMC Sierra Code
1. What does the OBDII code P147B mean on a 2015 GMC Sierra?
P147B indicates a "Particulate Matter Sensor Shunt Circuit High Current," meaning the engine control module (ECM) has detected excessive current in the particulate matter (PM) sensor shunt circuit.
2. What are the symptoms of the P147B code on a 2015 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced engine performance, increased fuel consumption, and potential diesel particulate filter (DPF) regeneration issues.
3. What causes the P147B code to appear?
Possible causes include a faulty particulate matter sensor, damaged wiring or connectors in the sensor circuit, excessive soot buildup, or a malfunctioning ECM.
4. Can I drive with the P147B code on my 2015 GMC Sierra?
While the vehicle may still be drivable, ignoring the P147B code can lead to further damage to the DPF system and reduced fuel efficiency. It's best to address the issue promptly.
5. How do I diagnose the P147B code on my 2015 GMC Sierra?
Diagnosis typically involves inspecting the PM sensor and its wiring for damage, checking for soot buildup, and using a multimeter to test circuit continuity and current levels.
6. How can I fix the P147B code on my 2015 GMC Sierra?
Repairs may include replacing the particulate matter sensor, repairing damaged wiring or connectors, cleaning the DPF, or updating/reprogramming the ECM if necessary.
7. How much does it cost to fix the P147B code on a 2015 GMC Sierra?
Repair costs vary but typically range from $200 to $800, depending on whether the PM sensor, wiring, or DPF requires replacement or cleaning.
8. Can a dirty diesel particulate filter cause the P147B code?
Yes, excessive soot buildup in the DPF can lead to abnormal readings from the PM sensor, potentially triggering the P147B code.
9. What tools are needed to troubleshoot the P147B code?
You may need an OBDII scanner, a multimeter, and basic hand tools to inspect and test the PM sensor and its circuit.
10. Will a software update fix the P147B code on my 2015 GMC Sierra?
In some cases, a software update or reprogramming of the ECM may be required to resolve the issue, especially if it’s caused by incorrect sensor calibration.
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