P24B6 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 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.
Code P24B6 Description
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.
What are the Possible Causes of the DTC P24B6?
- 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?
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 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.
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Information for Specific Makes
- P24B6 Buick — Particulate Matter Sensor Heater Control Circuit High Voltage
- P24B6 Cadillac — Particulate Matter Sensor Heater Control Circuit High Voltage
- P24B6 Chevrolet — Particulate Matter Sensor Heater Control Circuit High Voltage
- P24B6 GMC — Particulate Matter Sensor Heater Control Circuit High Voltage
Frequently Asked Questions about P24B6 Code
1. What are common symptoms of OBDII code P24B6 (Particulate Matter Sensor Heater Control Circuit High Voltage)?
- Common symptoms include the illumination of the check engine light, reduced engine performance, and potential issues with the vehicle's emission system.
2. What typically causes the OBDII code P24B6 to trigger?
- The code P24B6 is usually triggered by a malfunction in the particulate matter sensor heater control circuit, resulting in high voltage being detected.
3. How serious is the OBDII code P24B6 (Particulate Matter Sensor Heater Control Circuit High Voltage)?
- While the code itself may not cause immediate harm to the vehicle, it can lead to increased emissions and potential long-term damage to the emission control system if left unresolved.
4. Can driving with the OBDII code P24B6 active cause further damage to the vehicle?
- Continuing to drive with the code P24B6 active may result in increased emissions, reduced fuel efficiency, and potential damage to the particulate matter sensor and related components.
5. What are some DIY repair tips for addressing the OBDII code P24B6?
- DIY repair tips may include checking the sensor's wiring and connectors for damage, testing the heater circuit for proper voltage, and potentially replacing the particulate matter sensor if needed.
6. Is it safe to reset the check engine light after diagnosing and fixing the OBDII code P24B6?
- It is safe to reset the check engine light after diagnosing and fixing the issue causing the code P24B6. However, it is recommended to ensure that the repair has been successful before doing so.
7. Can a faulty particulate matter sensor cause the OBDII code P24B6 to appear?
- Yes, a faulty particulate matter sensor, particularly in its heater control circuit, can cause the OBDII code P24B6 to appear due to high voltage readings.
8. How can a mechanic diagnose the OBDII code P24B6 accurately?
- A mechanic may use a scan tool to retrieve the code and then perform further testing on the particulate matter sensor, its heater circuit, and related components to pinpoint the exact cause.
9. Are there any recalls or technical service bulletins related to the OBDII code P24B6?
- It is advisable to check with the vehicle manufacturer or authorized service centers for any recalls or technical service bulletins related to the OBDII code P24B6 to ensure proper diagnosis and repair.
10. What is the typical cost of repairing the OBDII code P24B6?
- The cost of repairing the OBDII code P24B6 can vary depending on the extent of the issue, the need for parts replacement, and labor costs. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.
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