P147B 2015 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado?
- 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 Chevrolet Silverado?
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 Chevrolet Silverado 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 Chevrolet Silverado Code
1. What does the OBDII code P147B mean on a 2015 Chevrolet Silverado?
Code P147B indicates a "Particulate Matter Sensor Shunt Circuit High Current," meaning the sensor circuit is detecting excessive current, potentially due to a fault in the sensor or wiring.
2. What are the symptoms of a P147B code on my Silverado?
Symptoms may include the check engine light turning on, reduced fuel efficiency, loss of engine power, or the vehicle entering limp mode.
3. What causes the P147B code to appear in a 2015 Chevy Silverado?
Common causes include a faulty particulate matter sensor, damaged or shorted wiring, connector issues, or a malfunctioning engine control module (ECM).
4. Can I drive my Silverado with a P147B code?
While the vehicle may still be drivable, prolonged use with this code can lead to increased emissions or potential damage to the exhaust system. It’s best to address the issue promptly.
5. How is the P147B code diagnosed?
A mechanic will typically inspect the particulate matter sensor, check the wiring and connectors for damage or corrosion, and use a scan tool to monitor sensor data and confirm high current readings.
6. How do I fix the P147B code on my Silverado?
Repairs may include replacing the particulate matter sensor, repairing or replacing damaged wiring, cleaning corroded connections, or, in rare cases, reprogramming or replacing the ECM.
7. How much does it cost to fix a P147B code on a 2015 Chevrolet Silverado?
Repair costs can vary but typically range from $200 to $600, depending on whether the sensor, wiring, or ECM requires replacement.
8. Can a dirty particulate filter cause the P147B code?
A clogged diesel particulate filter (DPF) itself doesn’t directly cause this code, but it can contribute to sensor issues if excessive soot buildup impacts the sensor.
9. Will clearing the P147B code with a scan tool fix the problem?
Clearing the code will turn off the check engine light temporarily, but if the underlying issue isn’t resolved, the code will likely reappear.
10. Is the P147B code covered under warranty for my 2015 Silverado?
Depending on your vehicle's mileage and warranty terms, emissions-related components like the particulate matter sensor may be covered under a federal emissions warranty. Check with your dealer for specifics.
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