P147B 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 GMC Sierra Code
What does the OBDII code P147B mean on a 2018 GMC Sierra?
Code P147B indicates an issue with the particulate matter sensor's shunt circuit experiencing high current, which monitors the exhaust system's particulate levels.
What are the common symptoms of code P147B on a 2018 GMC Sierra?
Symptoms may include the check engine light turning on, reduced engine performance, increased exhaust emissions, or potentially entering limp mode.
What causes the P147B code to appear on a GMC Sierra?
Common causes include a faulty particulate matter sensor, damaged wiring or connectors, or issues with the sensor circuit experiencing excessive current.
Can I drive my 2018 GMC Sierra with the P147B code?
Driving with this code is not recommended as it may lead to increased emissions, reduced engine efficiency, and potential damage to the exhaust system.
How do I diagnose the P147B code on a 2018 GMC Sierra?
A mechanic will typically inspect the particulate matter sensor, wiring, and connectors for damage, and use a scan tool to confirm sensor readings and circuit behavior.
What repairs are needed for a P147B code?
Repairs may include replacing the particulate matter sensor, repairing or replacing damaged wiring, or addressing any issues with the sensor circuit.
How much does it cost to fix the P147B code on a GMC Sierra?
Repair costs can range from $200 to $600, depending on whether the sensor needs replacement or if wiring repairs are required.
Can a dirty exhaust system cause the P147B code?
Yes, excessive soot or debris in the exhaust system can affect the particulate matter sensor's functionality and lead to this code.
Is the P147B code related to the diesel particulate filter (DPF)?
Yes, the particulate matter sensor monitors exhaust emissions, which are closely tied to the DPF's performance and efficiency.
What tools are needed to troubleshoot the P147B code?
A diagnostic scan tool, multimeter, and basic automotive tools are typically required to test the sensor and inspect the circuit for high current issues.
Discuss the causes and fixes for P147B 2018 GMC Sierra OBDII Code
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