AutoCodes – Buick – P1477 Buick

P1477 Buick 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 Buick 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 518

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

What does this mean?

What are the Possible Causes of the DTC P1477 Buick?

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 Buick?

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 Buick 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.

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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 P1477 Buick Code

1. What are the common symptoms of OBDII code P1477 in a Buick related to the Particulate Matter Sensor Temperature Circuit Low Voltage?

- Common symptoms may include poor engine performance, decreased fuel efficiency, and an illuminated check engine light.

2. What are the potential causes of OBDII code P1477 in a Buick?

- The code P1477 in a Buick is often caused by issues such as a faulty particulate matter sensor, damaged wiring or connectors, or a malfunctioning engine control module (ECM).

3. How can I diagnose the OBDII code P1477 in my Buick related to the Particulate Matter Sensor Temperature Circuit Low Voltage?

- Diagnosing the code P1477 typically involves using an OBDII scanner to retrieve the code, inspecting the particulate matter sensor and its connections, and testing the sensor's voltage and resistance.

4. What are some repair tips for fixing OBDII code P1477 in a Buick?

- Repair tips may include checking and repairing any damaged wiring or connectors, replacing the faulty particulate matter sensor if necessary, and clearing the code with an OBDII scanner after the repairs.

5. Can I drive my Buick with OBDII code P1477 related to the Particulate Matter Sensor Temperature Circuit Low Voltage?

- It is not recommended to drive your Buick with the code P1477 present, as it can lead to further engine damage and decreased performance. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P1477 in a Buick?

- The cost of repairing the OBDII code P1477 in a Buick can vary depending on the underlying cause of the issue. Costs may include parts replacement, labor fees, and diagnostic charges.

7. Can a DIY enthusiast fix OBDII code P1477 in a Buick themselves?

- While some experienced DIY enthusiasts may be able to diagnose and repair OBDII code P1477 in a Buick, it is recommended to seek professional help to ensure the issue is properly diagnosed and resolved.

8. Are there any preventative measures to avoid OBDII code P1477 in a Buick?

- To prevent OBDII code P1477, regular maintenance of the vehicle, such as checking the sensor connections, ensuring proper wiring integrity, and following the manufacturer's recommended service schedule, can help avoid such issues.

9. Is OBDII code P1477 related to the Particulate Matter Sensor Temperature Circuit Low Voltage a common issue in Buick vehicles?

- While OBDII code P1477 related to the Particulate Matter Sensor Temperature Circuit Low Voltage may not be extremely common in Buick vehicles, it can occur due to various factors affecting the sensor's performance.

10. Can OBDII code P1477 in a Buick cause any long-term damage if left unrepaired?

- Ignoring OBDII code P1477 related to the Particulate Matter Sensor Temperature Circuit Low Voltage can potentially lead to reduced engine efficiency, increased emissions, and possible damage to other engine components over time if left unrepaired.