P142B Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What does the OBDII code P142B mean on a Cadillac?
P142B indicates a high-temperature condition in the particulate matter sensor control module, which monitors the diesel particulate filter (DPF) system.
2. What are the common symptoms of code P142B in a Cadillac?
Symptoms may include the check engine light illuminating, reduced engine performance, poor fuel efficiency, and possible DPF regeneration issues.
3. What causes the P142B code to appear?
Common causes include a faulty particulate matter sensor, damaged wiring or connectors, excessive exhaust temperatures, or a malfunctioning control module.
4. Can I drive my Cadillac with the P142B code active?
Driving with this code is not recommended as it may lead to further damage to the DPF system or increased emissions.
5. How do I diagnose the P142B code on a Cadillac?
Diagnosis typically involves checking the particulate matter sensor for damage, testing the wiring and connectors, and using a scan tool to monitor exhaust temperature readings.
6. How can I fix the P142B code on my Cadillac?
Repairs may include replacing the particulate matter sensor, repairing damaged wiring, or updating the control module software if necessary.
7. Is the P142B code specific to diesel engines in Cadillacs?
Yes, this code is specific to diesel engines because it relates to the diesel particulate filter and its monitoring system.
8. How much does it cost to fix the P142B code on a Cadillac?
Repair costs can vary, ranging from $200 to $600 or more, depending on whether the sensor, wiring, or control module needs replacement.
9. Can a dirty diesel particulate filter cause the P142B code?
While a dirty DPF itself may not directly cause this code, excessive exhaust temperatures from a clogged DPF can trigger it.
10. How can I prevent the P142B code from occurring again?
Regular maintenance of the DPF system, timely sensor inspections, and using high-quality diesel fuel can help prevent this issue.
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