AutoCodes – GMC – P24B6 GMC

P24B6 GMC Code - Particulate Matter Sensor Heater Control Circuit High 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: P24B6 GMC indicates Particulate Matter Sensor Heater Control Circuit High 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 330

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 P24B6 GMC 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 P24B6 GMC - Particulate Matter Sensor Heater Control Circuit High Voltage - AutoCodes.com — P24B6 GMC Code - Particulate Matter Sensor Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P24B6 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 P24B6 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 P24B6 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.

Need more information about the P24B6 GMC code?

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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 P24B6 GMC Code

1. What are common symptoms of OBDII code P24B6 GMC?

The common symptoms of OBDII code P24B6 GMC, Particulate Matter Sensor Heater Control Circuit High Voltage, may include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What causes OBDII code P24B6 GMC to trigger?

OBDII code P24B6 GMC is triggered when the particulate matter sensor heater control circuit detects a high voltage condition. This can be caused by a faulty sensor, damaged wiring, or a problem with the sensor heater control module.

3. How serious is OBDII code P24B6 GMC?

While OBDII code P24B6 GMC may not cause immediate drivability issues, it is important to address it promptly to prevent potential damage to the particulate matter sensor and ensure optimal engine performance and emissions control.

4. How can I diagnose OBDII code P24B6 GMC?

Diagnosing OBDII code P24B6 GMC typically involves using a diagnostic scanner to retrieve the fault code, conducting a visual inspection of the sensor and its wiring, and performing tests on the sensor heater control circuit to identify the root cause of the high voltage condition.

5. Can I drive with OBDII code P24B6 GMC?

It is generally not recommended to drive with OBDII code P24B6 GMC present, as it can lead to poor engine performance and potential damage to emissions control components. It is best to address the issue as soon as possible.

6. How can OBDII code P24B6 GMC be repaired?

Repairing OBDII code P24B6 GMC may involve replacing the particulate matter sensor, repairing or replacing damaged wiring, or addressing issues with the sensor heater control module. It is recommended to follow manufacturer-specific repair procedures.

7. Are there any DIY tips for fixing OBDII code P24B6 GMC?

While some DIY enthusiasts may attempt to diagnose and fix OBDII code P24B6 GMC themselves, it is recommended to have a professional mechanic perform the repairs due to the complexity of the emissions control system and the need for specialized tools and knowledge.

8. How much does it cost to repair OBDII code P24B6 GMC?

The cost of repairing OBDII code P24B6 GMC can vary depending on the root cause of the issue, the labor rates in your area, and whether any parts need to be replaced. It is advisable to obtain quotes from local repair shops for an accurate estimate.

9. Can a faulty particulate matter sensor cause OBDII code P24B6 GMC?

Yes, a faulty particulate matter sensor can cause OBDII code P24B6 GMC to trigger, especially if the sensor is not functioning properly or the heater control circuit is detecting high voltage.

10. How can I prevent OBDII code P24B6 GMC from recurring?

To prevent OBDII code P24B6 GMC from recurring, it is essential to address any underlying issues promptly, perform regular maintenance on your vehicle, and follow the manufacturer's recommended service intervals for emissions system components.