P1477 Chevrolet 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 Chevrolet 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.
Code P1477 Chevrolet Description
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.
What are the Possible Causes of the DTC P1477 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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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Information for Specific Chevrolet Models
- P1477 2014 Chevrolet Silverado — Particulate Matter Sensor Temperature Circuit Low Voltage
- P1477 2015 Chevrolet Silverado — Particulate Matter Sensor Temperature Circuit Low Voltage
- P1477 2016 Chevrolet Silverado — Particulate Matter Sensor Temperature Circuit Low Voltage
- P1477 2017 Chevrolet Silverado — Particulate Matter Sensor Temperature Circuit Low Voltage
- P1477 2018 Chevrolet Silverado — Particulate Matter Sensor Temperature Circuit Low Voltage
Frequently Asked Questions about P1477 Chevrolet Code
1. What does the OBDII code P1477 on a Chevrolet indicate?
The code P1477 on a Chevrolet indicates a problem with the Particulate Matter Sensor Temperature Circuit, specifically pointing to a low voltage issue in the circuit.
2. What symptoms might I notice if my Chevrolet has the P1477 code?
Symptoms of the P1477 code may include reduced engine performance, increased exhaust emissions, a check engine light, and possibly a higher engine temperature reading.
3. What are common causes of the P1477 code in Chevrolets?
Common causes for the P1477 code include faulty particulate matter sensors, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.
4. How can I fix the P1477 code on my Chevrolet?
Repairing the P1477 code typically involves inspecting and replacing the particulate matter sensor, repairing any damaged wiring or connectors, and in some cases, updating or replacing the engine control module.
5. Is it safe to drive my Chevrolet with the P1477 code active?
While you might be able to drive with the P1477 code active, it's not recommended as it can lead to further damage to the engine or emission system, potentially causing more serious issues.
6. How is the P1477 code diagnosed in a Chevrolet?
Diagnosing the P1477 code involves using a scan tool to read the fault code and examining the particulate matter sensor and its associated wiring for signs of damage or malfunction. Further diagnostics might include checking the sensor’s voltage with a multimeter.
7. Can a P1477 code affect the fuel economy of my Chevrolet?
Yes, a P1477 code can affect the fuel economy. Since the particulate matter sensor helps in managing the engine's combustion process, any issues with it can lead to inefficient engine operation and increased fuel consumption.
8. What tools are required to diagnose and fix the P1477 code?
Tools needed to diagnose and fix the P1477 code include a diagnostic scan tool, a digital multimeter, and basic hand tools to access and replace components.
9. Could ignoring the P1477 code lead to other problems in my Chevrolet?
Ignoring the P1477 code can lead to more significant problems such as damage to the catalytic converter, poor engine performance, and failed emission tests, which could be costly to repair.
10. How much does it typically cost to repair the P1477 code in a Chevrolet?
The cost to repair the P1477 code can vary widely, depending on the specific cause and the labor rates in your area. Expenses can range from $150 to $400, with sensor replacement being one of the more common and costly fixes.
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