AutoCodes – Chevrolet – P1478 2014 Chevrolet Silverado

P1478 2014 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 2014 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.

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Code Popularity 288

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1478 2014 Chevrolet Silverado Description

The Particulate Matter (PM) sensor monitors the amount of the particulates (soot) in the diesel exhaust gas exiting the tailpipe. The PM sensor is similar to the heated oxygen sensor with a ceramic element but also includes an individually calibrated Sensor Control Unit (SCU). The sensing element includes comb-shaped Interdigital Electrodes (IDE), a heater and a positive temperature coefficient resistor for temperature measurement.
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.

OBDII Code P1478 2014 Chevrolet Silverado - Particulate Matter Sensor Temperature Circuit High Voltage - AutoCodes.com — P1478 2014 Chevrolet Silverado Code - Particulate Matter Sensor Temperature Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1478 2014 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 2014 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 2014 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.

Need more information about the P1478 2014 Chevrolet Silverado code?

Need more information on how to fix the P1478 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1478 2014 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P1478 on a 2014 Chevrolet Silverado?

The common symptoms of OBDII code P1478 on a 2014 Chevrolet Silverado include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What does the OBDII code P1478 "Particulate Matter Sensor Temperature Circuit High Voltage" mean on a 2014 Chevrolet Silverado?

The OBDII code P1478 on a 2014 Chevrolet Silverado indicates that there is a high voltage condition detected in the particulate matter sensor temperature circuit.

3. What are the possible causes of OBDII code P1478 on a 2014 Chevrolet Silverado?

Possible causes of OBDII code P1478 on a 2014 Chevrolet Silverado include a faulty particulate matter sensor, wiring issues in the sensor circuit, or a problem with the sensor temperature circuit.

4. How can I diagnose the OBDII code P1478 on my 2014 Chevrolet Silverado?

Diagnosing OBDII code P1478 on a 2014 Chevrolet Silverado involves using an OBDII scanner to retrieve the code, inspecting the particulate matter sensor and its wiring, and testing the sensor temperature circuit for proper voltage.

5. Can I still drive my 2014 Chevrolet Silverado with OBDII code P1478 present?

It is not recommended to drive your 2014 Chevrolet Silverado with OBDII code P1478 present, as it can lead to further damage to the particulate matter sensor and potentially affect the vehicle's performance.

6. How can I repair OBDII code P1478 on my 2014 Chevrolet Silverado?

Repairing OBDII code P1478 on a 2014 Chevrolet Silverado may involve replacing the faulty particulate matter sensor, repairing any damaged wiring in the sensor circuit, or addressing issues with the sensor temperature circuit.

7. Is it safe to ignore OBDII code P1478 on my 2014 Chevrolet Silverado?

Ignoring OBDII code P1478 on your 2014 Chevrolet Silverado is not recommended, as it can lead to increased emissions, reduced fuel efficiency, and potential engine performance issues.

8. How much does it cost to fix OBDII code P1478 on a 2014 Chevrolet Silverado?

The cost to fix OBDII code P1478 on a 2014 Chevrolet Silverado can vary depending on the exact cause of the issue, but it may range from around $200 to $500 or more, including parts and labor.

9. Can a DIY enthusiast repair OBDII code P1478 on a 2014 Chevrolet Silverado?

While some DIY enthusiasts may be able to diagnose and repair OBDII code P1478 on a 2014 Chevrolet Silverado, it is recommended to seek professional help, especially when dealing with sensor and wiring issues.

10. How can I prevent OBDII code P1478 from appearing on my 2014 Chevrolet Silverado?

To prevent OBDII code P1478 on your 2014 Chevrolet Silverado, it is essential to perform regular vehicle maintenance, address any warning signs promptly, and ensure the proper functioning of the particulate matter sensor and its related components.