AutoCodes – Cadillac – P147B Cadillac

P147B Cadillac 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 Cadillac 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 429

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 30, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P147B Cadillac?

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 Cadillac?

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 Cadillac 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.

Need more information about the P147B Cadillac 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

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P147B Cadillac Code

1. What are the common symptoms of OBDII code P147B in a Cadillac related to the Particulate Matter Sensor Shunt Circuit High Current?

The common symptoms include the Check Engine Light coming on, decreased fuel efficiency, and potential issues with the vehicle's emissions system.

2. What could cause the OBDII code P147B in a Cadillac to trigger the Particulate Matter Sensor Shunt Circuit High Current?

Possible causes include a faulty particulate matter sensor, damaged wiring in the shunt circuit, or issues with the sensor's connections and connections.

3. How can I diagnose the OBDII code P147B in my Cadillac for the Particulate Matter Sensor Shunt Circuit High Current issue?

Diagnosis involves using an OBDII scanner to read the code, inspecting the particulate matter sensor and its circuitry for any visible damage, and testing the sensor's functionality.

4. Can I continue driving my Cadillac with the OBDII code P147B related to the Particulate Matter Sensor Shunt Circuit High Current?

It is not recommended to continue driving the vehicle with this code present, as it can lead to decreased performance and potential long-term damage to the emissions system.

5. What are some repair tips for addressing the OBDII code P147B in a Cadillac with the Particulate Matter Sensor Shunt Circuit High Current issue?

Repair tips include checking and repairing any damaged wiring in the shunt circuit, replacing the faulty sensor if necessary, and clearing the code after completing the repairs.

6. How much does it typically cost to fix the OBDII code P147B in a Cadillac related to the Particulate Matter Sensor Shunt Circuit High Current?

The cost of repairs can vary depending on the extent of the issue, but it may involve expenses for replacing the sensor, repairing wiring, or seeking professional diagnostic and repair services.

7. Are there any preventive measures to avoid triggering the OBDII code P147B in a Cadillac due to the Particulate Matter Sensor Shunt Circuit High Current?

Regular maintenance checks, prompt addressing of any warning lights or symptoms, and keeping up with recommended service intervals can help prevent issues leading to this code.

8. Can a DIY enthusiast fix the OBDII code P147B related to the Particulate Matter Sensor Shunt Circuit High Current in a Cadillac?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address this code by following repair guides and tutorials. However, professional assistance is recommended for complex issues.

9. How long does it typically take to repair the OBDII code P147B in a Cadillac caused by the Particulate Matter Sensor Shunt Circuit High Current?

The repair time can vary based on the specific problem, parts availability, and the expertise of the person performing the repairs, but it may range from a few hours to a day.

10. Will resetting the OBDII code P147B in a Cadillac related to the Particulate Matter Sensor Shunt Circuit High Current solve the underlying issue?

Simply resetting the code without addressing the root cause, such as a faulty sensor or damaged wiring, will not solve the problem. It is essential to diagnose and repair the issue to prevent the code from reoccurring.