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AutoCodes - Generic - P147B

P147B Code - Particulate Matter Sensor Shunt Circuit High Current

- Code Popularity: 3,924 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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Code P147B Possible Causes

  • Faulty Exhaust Particulate Matter Sensor
  • Exhaust Particulate Matter Sensor harness is open or shorted
  • Exhaust Particulate Matter Sensor circuit poor electrical connection

How do I Fix the Code P147B?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

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What is the Cost to Diagnose the Code P147B?

Labor: 1.0

The cost of diagnosing the P147B code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

What are Code P147B Possible Symptoms?

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

Code P147B 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 - Particulate Matter Sensor Shunt Circuit High Current -
P147B Code - Particulate Matter Sensor Shunt Circuit High Current

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