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Engine-Codes – Generic – P1477

P1477 Code - Particulate Matter Sensor Temperature Circuit Low Voltage

Quick Answer

The P1477 diagnostic trouble code (DTC) refers to the Particulate Matter Sensor Temperature Circuit Low Voltage. Common causes include Faulty Particulate Matter Sensor: The sensor itself may be malfunctioning, causing inaccurate temperature readings, Wiring or Connection Issues: Problems with the wiring or connections to the sensor can lead to low voltage in the temperature circuit, Faulty Engine Control Module (ECM): A malfunctioning ECM can also trigger the P1477 code by failing to communicate properly with the sensor. 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 indicates Particulate Matter Sensor Temperature Circuit Low Voltage.
Common causes
Common causes include Faulty Particulate Matter Sensor: The sensor itself may be malfunctioning, causing inaccurate temperature readings, Wiring or Connection Issues: Problems with the wiring or connections to the sensor can lead to low voltage in the temperature circuit, Faulty Engine Control Module (ECM): A malfunctioning ECM can also trigger the P1477 code by failing to communicate properly with the sensor.
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 08, 2024
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Code P1477 Description

The P1477 diagnostic trouble code (DTC) refers to the Particulate Matter Sensor Temperature Circuit Low Voltage. This code indicates that there is a problem with the particulate matter sensor's temperature circuit in the vehicle's exhaust system. The particulate matter sensor is responsible for monitoring the level of particulate matter in the exhaust gases, which are harmful pollutants emitted by the vehicle. The sensor helps the vehicle's engine control module (ECM) adjust the fuel-air mixture to reduce emissions and improve overall engine performance.

OBDII Code P1477 - Particulate Matter Sensor Temperature Circuit Low Voltage
P1477 Code - Particulate Matter Sensor Temperature Circuit Low Voltage

Common Causes of P1477

  1. Faulty Particulate Matter Sensor: The sensor itself may be malfunctioning, causing inaccurate temperature readings.
  2. Wiring or Connection Issues: Problems with the wiring or connections to the sensor can lead to low voltage in the temperature circuit.
  3. Faulty Engine Control Module (ECM): A malfunctioning ECM can also trigger the P1477 code by failing to communicate properly with the sensor.
  4. Exhaust System Leaks: Leaks in the exhaust system can affect the sensor's readings, leading to low voltage in the temperature circuit.
  5. Environmental Factors: Extreme temperatures or environmental conditions can also impact the sensor's performance and trigger the code.

Symptoms of P1477

  1. Check Engine Light: The most common symptom associated with the P1477 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A decrease in fuel efficiency may be noticed due to the incorrect fuel-air mixture adjustments caused by the faulty particulate matter sensor.
  3. Failed Emissions Test: The vehicle may fail emissions tests due to increased emissions output as a result of the sensor issue.
  4. Rough Idling: The engine may experience rough idling or hesitation while driving, indicating a problem with the sensor's readings.
  5. Loss of Power: The vehicle may experience a loss of power or reduced performance due to incorrect fuel-air mixture adjustments.

How to Fix P1477

  1. Diagnostic Scan: Begin by using an OBD-II scanner to retrieve the stored trouble codes and pinpoint the issue causing the P1477 code.
  2. Inspect Sensor and Wiring: Check the particulate matter sensor and its wiring for any visible damage or faults. Replace any damaged components.
  3. Test ECM: Test the engine control module (ECM) to ensure it is functioning correctly and communicating with the sensor accurately.
  4. Repair Exhaust Leaks: Address any leaks in the exhaust system that may be affecting the sensor's readings.
  5. Clear Codes and Test Drive: After completing the repairs, clear the trouble codes from the ECM and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1477

The cost of repairing a P1477 code can vary depending on the specific cause of the issue, the vehicle make and model, and labor rates in the area. Typically, the cost of parts for this repair can range from $100 to $300, while labor costs can range from $80 to $150 per hour. Therefore, the total cost of repairing a P1477 code may fall between $200 and $600, including parts and labor. It is recommended to consult with a professional mechanic for a more accurate estimate based on your vehicle's specific details.

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Code P1477 Information for Specific Makes

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.

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