P1478 2016 Chevrolet Silverado Code - Particulate Matter Sensor Temperature Circuit High 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
- P1478 2016 Chevrolet Silverado indicates Particulate Matter Sensor Temperature Circuit High 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 P1478 2016 Chevrolet Silverado 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 a fault in the particulate matter sensor circuitry.
What are the Possible Causes of the DTC P1478 2016 Chevrolet Silverado?
- 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 P1478 2016 Chevrolet Silverado?
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 P1478 2016 Chevrolet Silverado 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 P1478 2016 Chevrolet Silverado Code
1. What does the OBDII code P1478 mean for a 2016 Chevrolet Silverado?
P1478 indicates a "Particulate Matter Sensor Temperature Circuit High Voltage" issue, meaning the ECM has detected an abnormally high voltage signal from the particulate matter sensor's temperature circuit.
2. What are common symptoms of the P1478 code in a 2016 Chevrolet Silverado?
Symptoms may include the check engine light turning on, reduced engine performance, increased emissions, or poor fuel efficiency.
3. What causes the P1478 code to appear in a 2016 Chevrolet Silverado?
Common causes include a faulty particulate matter sensor, damaged wiring or connectors, a short or open circuit, or a malfunctioning ECM.
4. How do I diagnose the P1478 code on my 2016 Chevrolet Silverado?
Start by scanning the vehicle with an OBDII scanner, inspecting the particulate matter sensor and its wiring for damage, and checking the voltage and resistance in the sensor circuit.
5. Can I drive my 2016 Chevrolet Silverado with the P1478 code?
Driving with this code is not recommended, as it may lead to increased emissions, reduced performance, and potential damage to the exhaust system.
6. How do I fix the P1478 code on a 2016 Chevrolet Silverado?
Repairs may involve replacing the particulate matter sensor, repairing or replacing damaged wiring or connectors, or updating/replacing the ECM if necessary.
7. How much does it cost to fix the P1478 code on a 2016 Chevrolet Silverado?
The cost depends on the repair; replacing the particulate matter sensor typically ranges from $200 to $600, while wiring repairs may cost less if no major damage is present.
8. Can a faulty particulate matter sensor cause other issues in my 2016 Chevrolet Silverado?
Yes, a faulty sensor can affect the vehicle’s emissions system, fuel efficiency, and engine performance, potentially causing additional OBDII codes to appear.
9. How can I prevent the P1478 code from reoccurring on my 2016 Chevrolet Silverado?
Regular maintenance, inspecting the exhaust system for damage, and promptly addressing any check engine light issues can help prevent this code from reoccurring.
10. Does the P1478 code require a professional mechanic to fix?
While some basic diagnostics and repairs can be done at home, addressing this code often requires specialized tools and expertise, so consulting a professional mechanic is recommended.
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