P24B5 GMC 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 GMC 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.
Code P24B5 GMC 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 P24B5 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 P24B5 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 P24B5 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.
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Frequently Asked Questions about P24B5 GMC Code
1. What does the OBDII code P24B5 mean for a GMC vehicle?
P24B5 indicates a low voltage issue in the Particulate Matter (PM) Sensor Heater Control Circuit, which is responsible for heating the PM sensor to ensure accurate emissions readings.
2. What are the common symptoms of code P24B5 in a GMC?
Symptoms may include the check engine light turning on, reduced fuel efficiency, increased emissions, or the vehicle entering limp mode in severe cases.
3. What causes the P24B5 code to appear in GMC vehicles?
Common causes include a faulty particulate matter sensor, wiring issues like corrosion or damage, a blown fuse, or a malfunctioning sensor heater control module.
4. How can I diagnose the P24B5 code on a GMC?
Diagnose this code by checking the PM sensor heater circuit for continuity, inspecting wires and connectors for damage, and testing the heater control module with a multimeter.
5. Can I drive my GMC with the P24B5 code?
Driving with this code is not recommended, as it may lead to increased emissions and potential damage to the exhaust or emissions systems over time.
6. How do you fix the P24B5 code on a GMC?
Repairs may involve replacing the particulate matter sensor, repairing damaged wiring, replacing a blown fuse, or addressing a faulty control module.
7. How much does it cost to fix the P24B5 code on a GMC?
The repair cost varies but typically ranges from $200 to $600, depending on whether the issue is with the sensor, wiring, or control module.
8. Can a dirty particulate matter sensor cause the P24B5 code?
A dirty PM sensor is unlikely to cause this specific code, as it relates to the sensor’s heater control circuit rather than the sensor’s ability to detect particulates.
9. What tools are needed to troubleshoot the P24B5 code on a GMC?
You’ll need an OBDII scanner, a multimeter to test for voltage and continuity, and possibly wiring diagrams for your GMC model.
10. Will clearing the P24B5 code with an OBDII scanner fix the problem?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P24B5 GMC OBDII Code
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