AutoCodes – GMC – P1474 GMC

P1474 GMC Code - Particulate Matter Sensor Electrode Supply Circuit

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: P1474 GMC indicates Particulate Matter Sensor Electrode Supply Circuit.
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 516

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 P1474 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 P1474 GMC - Particulate Matter Sensor Electrode Supply Circuit - AutoCodes.com — P1474 GMC Code - Particulate Matter Sensor Electrode Supply Circuit

What does this mean?

What are the Possible Causes of the DTC P1474 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 P1474 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 P1474 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 P1474 GMC code?

Need more information on how to fix the P1474 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1474 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P1474 2014 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit
P1474 2015 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit
P1474 2016 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit
P1474 2017 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit
P1474 2018 GMC Sierra — Particulate Matter Sensor Electrode Supply Circuit

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 P1474 GMC Code

1. What are common symptoms of OBDII code P1474 GMC?

The common symptoms of OBDII code P1474 GMC include poor engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What does OBDII code P1474 GMC indicate?

OBDII code P1474 GMC indicates an issue with the Particulate Matter Sensor Electrode Supply Circuit.

3. What are possible causes of OBDII code P1474 GMC?

Possible causes of OBDII code P1474 GMC include a faulty particulate matter sensor, damaged wiring or connectors in the electrode supply circuit, or a problem with the powertrain control module.

4. How can I diagnose the Particulate Matter Sensor Electrode Supply Circuit issue?

Diagnosing the Particulate Matter Sensor Electrode Supply Circuit issue involves using an OBDII scanner to retrieve the specific fault code, inspecting the sensor and its connections for damage, and testing the circuit for continuity.

5. Can I drive my vehicle with OBDII code P1474 GMC?

It is not recommended to drive your vehicle with OBDII code P1474 GMC as it can lead to further damage and potential safety issues. It is best to address the underlying problem promptly.

6. How can I repair OBDII code P1474 GMC?

Repairing OBDII code P1474 GMC may involve replacing the faulty particulate matter sensor, repairing or replacing damaged wiring or connectors, or reprogramming the powertrain control module.

7. Will OBDII code P1474 GMC cause emissions issues?

Yes, OBDII code P1474 GMC can cause emissions issues due to improper functioning of the Particulate Matter Sensor Electrode Supply Circuit, which may affect the vehicle's emissions control system.

8. How much does it cost to fix OBDII code P1474 GMC?

The cost to fix OBDII code P1474 GMC can vary depending on the specific cause of the issue, the extent of the repairs needed, and labor costs. It is advisable to consult a professional mechanic for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P1474 GMC?

While some aspects of diagnosing and repairing OBDII code P1474 GMC can be tackled by a DIY enthusiast with the right tools and knowledge, it is recommended to seek assistance from a qualified mechanic for proper diagnosis and repair to ensure the issue is resolved effectively.

10. How can I prevent OBDII code P1474 GMC from recurring?

To prevent OBDII code P1474 GMC from recurring, it is essential to perform regular maintenance on your vehicle, address any warning lights promptly, and follow the manufacturer's recommended service schedule for optimal performance of the particulate matter sensor and related components.