P142E Buick Code - Particulate Matter Sensor Control Module Temperature Sensor 2 Low Voltage
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
- P142E Buick indicates Particulate Matter Sensor Control Module Temperature Sensor 2 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 P142E Buick 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) when the Particular Matter Sensor Control Unit detects an internal electrical fault or an over-temperature condition on one of the internal temperature sensors.
What are the Possible Causes of the DTC P142E Buick?
- 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 P142E Buick?
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 P142E Buick 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 P142E Buick Code
1. What does the OBDII code P142E mean on a Buick?
P142E indicates that the Particulate Matter Sensor Control Module has detected a low voltage signal from Temperature Sensor 2, which is used to monitor the exhaust system's performance.
2. What are the common symptoms of the P142E code?
Symptoms may include an illuminated check engine light, reduced fuel efficiency, increased emissions, or potential loss of engine power in severe cases.
3. What causes the P142E code to appear?
Common causes include a faulty particulate matter sensor, damaged wiring or connectors, a malfunctioning temperature sensor, or issues within the exhaust system.
4. Can I drive my Buick with the P142E code?
While your car may still be drivable, ignoring this code could lead to reduced performance, higher emissions, and potential damage to other exhaust components.
5. How can I diagnose the P142E code?
Start by using an OBDII scanner to confirm the code, then visually inspect the wiring and connectors around the particulate matter sensor and its temperature sensors for damage or corrosion.
6. What repairs are needed to fix the P142E code?
Repairs might include replacing the temperature sensor, repairing or replacing damaged wiring, cleaning or replacing the particulate matter sensor, or updating the control module's software.
7. How much does it cost to fix a P142E code on a Buick?
The cost can vary, but replacing a temperature sensor typically ranges from $200 to $400, including parts and labor. Wiring repairs might cost less, depending on the extent of the damage.
8. Can a software update fix the P142E code?
In some cases, a software update for the engine control module or particulate matter sensor control module may resolve the issue if it’s related to incorrect calibration or programming.
9. How can I prevent the P142E code from returning?
Regular maintenance of your exhaust system, including inspecting sensors and wiring, can help prevent this code. Using high-quality fuel and keeping the particulate filter clean may also reduce the likelihood of recurrence.
10. Is the P142E code specific to Buicks?
No, the P142E code can appear on other vehicles as well, but the exact diagnostic and repair process may vary depending on the make and model. Always refer to your vehicle's service manual for guidance.
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