Engine-Codes.com
Engine-Codes – GMC – P1478 2016 GMC Sierra

P1478 2016 GMC Sierra Code - Particulate Matter Sensor Temperature Circuit High Voltage

Quick Answer

The P1478 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Particulate Matter Sensor Temperature Circuit High Voltage. Common causes include Faulty particulate matter sensor, Wiring issues or shorts in the temperature circuit, Malfunctioning engine control module (ECM). 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 GMC Sierra indicates Particulate Matter Sensor Temperature Circuit High Voltage.
Common causes
Common causes include Faulty particulate matter sensor, Wiring issues or shorts in the temperature circuit, Malfunctioning engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1478 2016 GMC Sierra Description

The P1478 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates a problem with the Particulate Matter Sensor Temperature Circuit High Voltage. This sensor is a crucial component of the vehicle's emissions control system, specifically designed to monitor the temperature of the particulate matter sensor. The particulate matter sensor is responsible for detecting the level of soot or particulate matter in the exhaust gases emitted by the vehicle.

OBDII Code P1478 2016 GMC Sierra - Particulate Matter Sensor Temperature Circuit High Voltage
P1478 2016 GMC Sierra Code - Particulate Matter Sensor Temperature Circuit High Voltage

Common Causes of P1478 2016 GMC Sierra

  1. Faulty particulate matter sensor
  2. Wiring issues or shorts in the temperature circuit
  3. Malfunctioning engine control module (ECM)
  4. Exhaust system leaks
  5. High engine operating temperatures

Symptoms of P1478 2016 GMC Sierra

  1. Check engine light illuminated
  2. Decreased fuel efficiency
  3. Rough idling or engine misfires
  4. Reduced engine power
  5. Increased emissions

How to Fix P1478 2016 GMC Sierra

  1. Begin by using a diagnostic scanner to retrieve the trouble codes and confirm that P1478 is the specific issue.
  2. Inspect the wiring and connections related to the particulate matter sensor temperature circuit for any damage or corrosion. Repair or replace as needed.
  3. Test the particulate matter sensor using a multimeter to check for proper voltage and resistance readings. Replace the sensor if it is faulty.
  4. Clear the trouble codes from the vehicle's ECM using the diagnostic scanner and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to pinpoint the exact cause, such as testing the ECM or exhaust system components.

Cost to Fix P1478 2016 GMC Sierra

The typical repair costs for addressing a P1478 code on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a new particulate matter sensor and potential wiring repairs can range from $200 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair bill likely falling between $300 and $800. However, it's important to note that prices can fluctuate based on location, the specific make and model of the vehicle, and the rates charged by individual repair facilities. It's recommended to obtain quotes from local shops to get a more accurate estimate for this repair.

Need more information about the P1478 2016 GMC Sierra code?

Need more information on how to fix the P1478 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1478 2016 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2016 GMC Sierra Code

1. What does the OBDII code P1478 mean on a 2016 GMC Sierra?

P1478 indicates a "Particulate Matter Sensor Temperature Circuit High Voltage," meaning the engine control module (ECM) has detected a high voltage signal from the particulate matter sensor temperature circuit.

2. What are the symptoms of code P1478 in a 2016 GMC Sierra?

Common symptoms include an illuminated check engine light, reduced engine performance, poor fuel efficiency, and potential issues with the diesel particulate filter (DPF) regeneration process.

3. What causes the P1478 code to appear on a 2016 GMC Sierra?

Possible causes include a faulty particulate matter sensor, damaged wiring or connectors in the temperature circuit, a short to voltage, or a malfunctioning ECM.

4. Can I still drive my 2016 GMC Sierra with the P1478 code active?

While the vehicle may still be drivable, continuing to operate it with this code can lead to further damage to the emissions system or reduced performance. It's best to address the issue promptly.

5. How is the P1478 code diagnosed?

A mechanic will use a scan tool to confirm the code, visually inspect the wiring and connectors, test the particulate matter sensor, and check for continuity or voltage issues in the circuit.

6. What repairs can fix the P1478 code in a 2016 GMC Sierra?

Repairs may include replacing the particulate matter sensor, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to repair the P1478 code in a 2016 GMC Sierra?

Repair costs vary but typically range from $200 to $600, depending on whether the particulate matter sensor, wiring, or ECM needs to be repaired or replaced.

8. Can a faulty particulate matter sensor cause other issues in the 2016 GMC Sierra?

Yes, a faulty sensor can disrupt the DPF regeneration process, leading to excessive soot buildup and potential damage to the emissions system.

9. Is the P1478 code covered under warranty for a 2016 GMC Sierra?

If your vehicle is still under the emissions warranty, the repair may be covered. Check with your dealership for details.

10. How can I prevent the P1478 code from occurring again?

Regular maintenance, inspecting wiring for damage, and addressing check engine light issues promptly can help prevent this code from recurring.

Discuss the causes and fixes for P1478 2016 GMC Sierra OBDII Code

Submit a New Comment

Code P1478 2016 GMC Sierra comments

No comments found for this page.