AutoCodes – GMC – P1476 GMC

P1476 GMC Code - Particulate Matter Sensor Electrode Supply 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: P1476 GMC indicates Particulate Matter Sensor Electrode Supply 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 1,446

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 Sep 30, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1476 GMC 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 P1476 GMC - Particulate Matter Sensor Electrode Supply Circuit High Voltage - AutoCodes.com — P1476 GMC Code - Particulate Matter Sensor Electrode Supply Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1476 GMC?

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 P1476 GMC?

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 P1476 GMC 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 P1476 GMC code?

Need more information on how to fix the P1476 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1476 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P1476 2014 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 2015 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 2016 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 2017 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit High Voltage
P1476 2018 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit High Voltage

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 P1476 GMC Code

1. What are the common symptoms of OBDII code P1476 GMC?

The common symptoms of code P1476 GMC include poor engine performance, rough idling, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What can cause the Particulate Matter Sensor Electrode Supply Circuit High Voltage code?

The P1476 GMC code is typically caused by a faulty particulate matter sensor, damaged wiring or connectors in the electrode supply circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the P1476 GMC trouble code?

Diagnosing the P1476 GMC code involves using an OBDII scanner to retrieve the code, inspecting the particulate matter sensor and its wiring for damage, and testing the electrode supply circuit for proper voltage levels.

4. Can a dirty air filter trigger the P1476 GMC code?

Yes, a clogged or dirty air filter can cause improper air intake, leading to an imbalance in the particulate matter sensor readings and potentially triggering the P1476 GMC code.

5. What are some repair tips for addressing the P1476 GMC code?

Repair tips for resolving the P1476 GMC code include checking and cleaning the air filter, inspecting and repairing any damaged wiring or connectors in the electrode supply circuit, and replacing the particulate matter sensor if necessary.

6. Is it safe to continue driving with the P1476 GMC trouble code present?

It is not recommended to continue driving with the P1476 GMC code active, as it can lead to further engine damage and potential safety hazards. It is best to address the issue promptly.

7. How much does it typically cost to repair the P1476 GMC code?

The cost of repairing the P1476 GMC code can vary depending on the underlying cause. Repairs may range from simple fixes like replacing a sensor or connector to more extensive repairs involving the PCM, with costs ranging from $100 to $500 or more.

8. Can I reset the Check Engine Light on my GMC after fixing the P1476 code?

Yes, once the underlying issue triggering the P1476 code has been repaired, you can reset the Check Engine Light using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

9. Will the P1476 GMC code cause my vehicle to fail an emissions test?

Yes, the P1476 GMC code is related to emissions control systems, and if not addressed, it can cause your vehicle to fail an emissions test due to increased emissions levels.

10. How often does the P1476 GMC code occur in GMC vehicles?

The P1476 GMC trouble code is relatively uncommon but can occur in GMC vehicles equipped with particulate matter sensors and related systems. If you encounter this code, it is essential to address it promptly to maintain optimal vehicle performance.