AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Cadillac - P147B Cadillac

P147B Cadillac Code - Particulate Matter Sensor Shunt Circuit High Current

- Code Popularity: 232 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P147B Cadillac?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Exhaust Particulate Matter Sensor
  • Exhaust Particulate Matter Sensor harness is open or shorted
  • Exhaust Particulate Matter Sensor circuit poor electrical connection
⚠ Does your Cadillac have Safety Recalls? → Check here

How to Fix the DTC P147B Cadillac?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P147B Cadillac Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P147B Cadillac code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P147B Cadillac Description

The Particulate Matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. The PM sensor is similar to the heated oxygen sensor with a ceramic element but also includes an individually calibrated Sensor Control Unit (SCU). The sensing element includes comb-shaped Interdigital Electrodes (IDE), a heater and a positive temperature coefficient resistor for temperature measurement.
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.

OBDII Code P147B Cadillac - Particulate Matter Sensor Shunt Circuit High Current - AutoCodes.com
P147B Cadillac Code - Particulate Matter Sensor Shunt Circuit High Current

Need More Information on the Code?

Need more information on how to fix the P147B Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P147B Cadillac code diagnosed by a professional: Find a repair shop in your area

Code P147B Cadillac comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P147B Cadillac code? Have you replaced any parts?
Any information is appreciated. Thanks