AutoCodes – Generic – P24B5

P24B5 Code - Particulate Matter Sensor Heater Control Circuit Low Voltage

Quick Answer

The Particulate Matter (PM) sensor monitors the amount of 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: P24B5 indicates Particulate Matter Sensor Heater Control Circuit Low Voltage.
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.

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Code Popularity 9,229

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 Jul 29, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P24B5 Description

The Particulate Matter (PM) sensor monitors the amount of 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 an internal fault of the sensor, fault of the sensor circuitry, or low voltage on the sensor supply circuit.

OBDII Code P24B5 - Particulate Matter Sensor Heater Control Circuit Low Voltage - AutoCodes.com — P24B5 Code - Particulate Matter Sensor Heater Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P24B5?

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 P24B5?

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 P24B5 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 P24B5 code?

Need more information on how to fix the P24B5 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P24B5 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P24B5 Buick — Particulate Matter Sensor Heater Control Circuit Low Voltage
P24B5 Cadillac — Particulate Matter Sensor Heater Control Circuit Low Voltage
P24B5 Chevrolet — Particulate Matter Sensor Heater Control Circuit Low Voltage
P24B5 GMC — Particulate Matter Sensor Heater Control Circuit Low Voltage

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 P24B5 Code

1. What are the common symptoms of OBDII code P24B5?

The common symptoms of OBDII code P24B5, Particulate Matter Sensor Heater Control Circuit Low Voltage, may include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What can cause OBDII code P24B5 to trigger?

OBDII code P24B5 can be triggered by issues such as a faulty particulate matter sensor, a damaged sensor heater, a wiring issue in the sensor circuit, or a failed sensor heater control module.

3. How can I diagnose the cause of OBDII code P24B5?

To diagnose the cause of OBDII code P24B5, a technician can use a diagnostic scan tool to read the code, perform a visual inspection of the sensor and its wiring, test the sensor heater circuit for continuity, and check for any loose connections or corrosion.

4. Can I continue driving with OBDII code P24B5 present?

It is not recommended to continue driving with OBDII code P24B5 present, as it can lead to potential issues with engine performance and emissions. It is best to address the underlying problem promptly.

5. How can OBDII code P24B5 be repaired?

Repairing OBDII code P24B5 typically involves replacing the faulty particulate matter sensor, repairing or replacing damaged wiring in the sensor circuit, testing and replacing the sensor heater if necessary, or addressing any issues with the sensor heater control module.

6. Is it possible to reset OBDII code P24B5 without repairs?

While clearing the code using a diagnostic scan tool may temporarily turn off the check engine light, the underlying issue causing OBDII code P24B5 will remain unresolved. It is essential to address the root cause to prevent future problems.

7. How much does it cost to repair OBDII code P24B5?

The cost of repairing OBDII code P24B5 can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of parts needed for the repair. It is recommended to consult with a professional technician for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P24B5 at home?

While some DIY enthusiasts may be able to diagnose and repair OBDII code P24B5 at home, it is a complex issue that may require specialized tools and knowledge. It is advisable to seek professional help if you are unsure about how to proceed.

9. Will OBDII code P24B5 cause my vehicle to fail an emissions test?

OBDII code P24B5, indicating an issue with the particulate matter sensor heater control circuit, can cause your vehicle to fail an emissions test due to increased emissions and potential non-compliance with emission standards. It is essential to address the problem before undergoing an emissions test.

10. How long does it take to repair OBDII code P24B5?

The time required to repair OBDII code P24B5 can vary depending on the cause of the issue, the availability of parts, and the expertise of the technician. In some cases, the repair can be completed within a few hours, while more complex issues may take longer to resolve.