P147B 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code
What does the OBDII code P147B mean on a 2014 GMC Sierra?
The P147B code indicates a problem with the Particulate Matter Sensor Shunt Circuit, specifically detecting high current in the circuit.
What are the common symptoms of code P147B?
Symptoms may include an illuminated check engine light, reduced fuel efficiency, decreased engine performance, or the vehicle entering limp mode.
What causes the P147B code to appear?
The code is typically caused by a short circuit, damaged wiring, a faulty particulate matter sensor, or issues with the vehicle’s powertrain control module (PCM).
Can I drive my GMC Sierra with the P147B code?
It is not recommended to drive for extended periods with this code, as it can lead to further damage to the exhaust or emissions system.
How can I diagnose the P147B code?
Diagnosis involves checking the particulate matter sensor, inspecting the wiring and connectors for damage or corrosion, and using a scan tool to monitor sensor readings and circuit performance.
What tools are needed to fix the P147B code?
A multimeter, an OBDII scan tool, and basic tools for inspecting and repairing wiring are typically needed to troubleshoot and repair the issue.
How do I fix the P147B code?
Repairs may include replacing the particulate matter sensor, repairing damaged wiring or connectors, or reprogramming the PCM if necessary.
How much does it cost to repair the P147B code?
Repair costs vary depending on the issue, but replacing a particulate matter sensor can cost $300–$600, plus labor fees.
Can a bad particulate matter sensor cause other issues?
Yes, a faulty particulate matter sensor can lead to increased emissions, reduced fuel efficiency, and potential damage to the diesel particulate filter (DPF).
How can I prevent the P147B code from recurring?
Regular maintenance of the exhaust and emissions system, including inspecting wiring and keeping the DPF clean, can help prevent this code from returning.
Discuss the causes and fixes for P147B 2014 GMC Sierra OBDII Code
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