P118B GMC Code - Particulate Matter Sensor Temperature Not Plausible
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
- P118B GMC indicates Particulate Matter Sensor Temperature Not Plausible.
- 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 P118B 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).
What are the Possible Causes of the DTC P118B 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 P118B 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 P118B 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 P118B GMC Code
1. What are the common symptoms of the OBDII code P118B GMC?
The common symptoms of the P118B code include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.
2. What does the OBDII code P118B GMC indicate?
The P118B code indicates that the particulate matter sensor temperature is not plausible, suggesting an issue with the sensor's temperature readings.
3. What are the possible causes of the P118B GMC code?
Possible causes of the P118B code include a faulty particulate matter sensor, wiring issues, sensor calibration problems, or a malfunctioning engine control module.
4. How can I diagnose the P118B code on my GMC vehicle?
Diagnosing the P118B code typically involves using an OBDII scanner to read the code, checking the sensor's wiring and connections, and testing the sensor's temperature readings for accuracy.
5. Can I drive my GMC vehicle with the P118B code?
It is not recommended to drive your vehicle with the P118B code present, as it can lead to further engine damage and decreased performance. It is advisable to address the issue promptly.
6. How can I repair the P118B code on my GMC vehicle?
Repairing the P118B code may involve replacing the particulate matter sensor, repairing faulty wiring connections, recalibrating the sensor, or reprogramming the engine control module.
7. Is it possible to reset the P118B code without fixing the underlying issue?
Resetting the code without addressing the underlying issue may temporarily turn off the check engine light, but the problem will likely reoccur. It is crucial to diagnose and repair the root cause.
8. What should I do if the P118B code keeps coming back after repairs?
If the P118B code keeps coming back after repairs, it is recommended to recheck the sensor, wiring, and connections for any faults, and ensure proper installation and calibration of the sensor.
9. Can a DIY enthusiast fix the P118B code issue?
Depending on the DIY enthusiast's skill level and access to tools, it may be possible to address the P118B code by following repair guides and utilizing the necessary diagnostic equipment.
10. Are there any recalls or technical service bulletins related to the P118B GMC code?
It is advisable to check with GMC dealerships or online resources for any recalls or technical service bulletins related to the P118B code, as there may be known issues and solutions provided by the manufacturer.
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