P142B Buick Code - Particulate Matter Sensor Control Module High Temperature
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
- P142B Buick indicates Particulate Matter Sensor Control Module High Temperature.
- 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 P142B 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 P142B 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 P142B 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 P142B 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 P142B Buick Code
What does OBDII code P142B mean on a Buick?
P142B indicates an issue with the Particulate Matter Sensor Control Module detecting excessively high temperatures in the exhaust system.
What are the common symptoms of code P142B?
Symptoms may include the check engine light turning on, poor fuel efficiency, reduced engine performance, or visible smoke from the exhaust.
What causes code P142B on a Buick?
Common causes include a faulty particulate matter sensor, a damaged control module, excessive exhaust temperatures, or wiring issues related to the sensor.
Can driving with code P142B damage my Buick?
Yes, driving with this code active can cause further damage to the exhaust system or engine and may lead to increased emissions.
How is code P142B diagnosed?
A mechanic will use a diagnostic tool to read the code, inspect the particulate matter sensor, check wiring connections, and evaluate exhaust system components.
How do you fix code P142B on a Buick?
Repairs may include replacing the particulate matter sensor, repairing or replacing damaged wiring, or addressing exhaust system issues causing high temperatures.
Is it expensive to fix code P142B?
The cost depends on the specific issue, but replacing the particulate matter sensor or related components can range from moderate to high repair costs.
Can I reset code P142B without fixing the problem?
While you can clear the code temporarily, the issue will likely return unless the underlying problem is resolved.
What should I check first if I get code P142B?
Start by inspecting the particulate matter sensor and its wiring for visible damage or disconnections.
Does code P142B affect emissions?
Yes, this code can result in higher emissions due to improper exhaust system operation.
Discuss the causes and fixes for P142B Buick OBDII Code
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