P147B GMC 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 GMC 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 GMC 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 GMC?
- 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 GMC?
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 GMC 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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Information for Specific GMC Models
- P147B 2014 GMC Sierra — Particulate Matter Sensor Shunt Circuit High Current
- P147B 2015 GMC Sierra — Particulate Matter Sensor Shunt Circuit High Current
- P147B 2016 GMC Sierra — Particulate Matter Sensor Shunt Circuit High Current
- P147B 2017 GMC Sierra — Particulate Matter Sensor Shunt Circuit High Current
- P147B 2018 GMC Sierra — Particulate Matter Sensor Shunt Circuit High Current
Frequently Asked Questions about P147B GMC Code
1. What are the common symptoms of OBDII code P147B GMC (Particulate Matter Sensor Shunt Circuit High Current)?
- Common symptoms include illuminated Check Engine Light, decreased fuel efficiency, and potential loss of engine power.
2. What can cause the OBDII code P147B GMC to trigger?
- The code can be triggered by a faulty particulate matter sensor, damaged wiring in the shunt circuit, or a problem with the sensor module.
3. How can I diagnose the OBDII code P147B GMC?
- Diagnosis typically involves using a diagnostic scanner to read the code, inspecting the wiring and connections related to the particulate matter sensor, and testing the sensor itself.
4. Can driving with the OBDII code P147B GMC cause further damage to the vehicle?
- Continuing to drive with this code may lead to reduced engine performance and potentially cause damage to the particulate matter sensor or other related components.
5. What are the repair options for OBDII code P147B GMC?
- Repair options may include replacing the faulty particulate matter sensor, repairing damaged wiring in the shunt circuit, or resetting the code after addressing the underlying issue.
6. Is it safe to drive with the Check Engine Light on due to OBDII code P147B GMC?
- It is generally not recommended to drive with the Check Engine Light on, as it indicates a potential issue that may affect the vehicle's performance and efficiency.
7. How much does it typically cost to repair OBDII code P147B GMC?
- The cost of repairs can vary depending on the extent of the issue, but it may range from a few hundred dollars for sensor replacement to more for complex wiring repairs.
8. Can I reset the OBDII code P147B GMC without fixing the underlying issue?
- While you can reset the code using a diagnostic scanner, it is important to address the root cause to prevent the issue from recurring and potentially causing further damage.
9. How long does it take to repair OBDII code P147B GMC?
- The repair time can vary based on the specific issue and the expertise of the technician, but it may take a few hours to a day to diagnose and fix the problem.
10. Is the OBDII code P147B GMC a common issue in GMC vehicles?
- While it may not be as common as some other codes, issues related to the particulate matter sensor and shunt circuit can occur in GMC vehicles, especially in models equipped with diesel engines.
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