AutoCodes – GMC – P1477 GMC

P1477 GMC Code - Particulate Matter Sensor Temperature Circuit Low 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: P1477 GMC indicates Particulate Matter Sensor Temperature Circuit Low 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 1,017

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 P1477 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 P1477 GMC - Particulate Matter Sensor Temperature Circuit Low Voltage - AutoCodes.com — P1477 GMC Code - Particulate Matter Sensor Temperature Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1477 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 P1477 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 P1477 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 P1477 GMC code?

Need more information on how to fix the P1477 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1477 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P1477 2014 GMC Sierra — Particulate Matter Sensor Temperature Circuit Low Voltage
P1477 2015 GMC Sierra — Particulate Matter Sensor Temperature Circuit Low Voltage
P1477 2016 GMC Sierra — Particulate Matter Sensor Temperature Circuit Low Voltage
P1477 2017 GMC Sierra — Particulate Matter Sensor Temperature Circuit Low Voltage
P1477 2018 GMC Sierra — Particulate Matter Sensor Temperature Circuit Low 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 P1477 GMC Code

1. What are the common symptoms of OBDII code P1477 GMC?

The common symptoms of code P1477 GMC include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine Light.

2. What can cause the Particulate Matter Sensor Temperature Circuit Low Voltage code?

This code is typically triggered by a malfunction in the particulate matter sensor, damaged wiring or connectors in the sensor circuit, or a faulty sensor temperature circuit.

3. How can I diagnose the cause of OBDII code P1477 GMC?

To diagnose the cause of P1477 GMC, you can use a diagnostic scanner to retrieve the fault codes, visually inspect the sensor and its wiring for any visible damage, and perform circuit tests to check for continuity and proper voltage.

4. Is it safe to continue driving with OBDII code P1477 GMC?

It is not recommended to continue driving with code P1477 GMC present, as it can lead to further damage to the engine and emissions system. It is best to address the issue promptly.

5. Can I repair OBDII code P1477 GMC on my own?

While some DIY enthusiasts may attempt to repair this code themselves, it is recommended to seek professional help to accurately diagnose and fix the underlying issue causing P1477 GMC.

6. What are the potential repair options for OBDII code P1477 GMC?

Repair options for code P1477 GMC may include replacing the particulate matter sensor, repairing or replacing damaged wiring or connectors, or addressing any issues with the sensor temperature circuit.

7. How much does it typically cost to fix OBDII code P1477 GMC?

The cost to fix code P1477 GMC can vary depending on the underlying cause of the issue, the extent of the repairs needed, and labor costs. It is advisable to get a few quotes from reputable mechanics for an accurate estimate.

8. Will resetting the Check Engine Light resolve OBDII code P1477 GMC?

Simply resetting the Check Engine Light may temporarily turn it off, but it will not fix the underlying issue causing code P1477 GMC. The problem should be diagnosed and repaired to prevent further issues.

9. Can extreme weather conditions affect OBDII code P1477 GMC?

Yes, extreme weather conditions such as very low temperatures can potentially impact the performance of the particulate matter sensor and its temperature circuit, leading to the triggering of code P1477 GMC.

10. How important is it to address OBDII code P1477 GMC promptly?

It is important to address code P1477 GMC promptly to prevent any potential damage to the engine, emissions system, and to ensure optimal vehicle performance and fuel efficiency.