P1477 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado 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 2014 Chevrolet Silverado?
- 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 2014 Chevrolet Silverado?
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 2014 Chevrolet Silverado 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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Frequently Asked Questions about P1477 2014 Chevrolet Silverado Code
1. What does OBDII code P1477 mean for a 2014 Chevrolet Silverado?
P1477 indicates a "Particulate Matter Sensor Temperature Circuit Low Voltage," meaning the PM sensor's temperature circuit is detecting voltage lower than the expected range.
2. What are the common symptoms of code P1477 in a 2014 Silverado?
Symptoms can include an illuminated check engine light, reduced fuel efficiency, poor engine performance, and possibly entering limp mode.
3. What causes the P1477 code to appear?
Common causes include a faulty particulate matter sensor, damaged wiring or connectors in the temperature circuit, or a malfunctioning Engine Control Module (ECM).
4. Can I drive my 2014 Silverado with the P1477 code?
While the truck may still be drivable, it is not recommended as it can reduce engine performance and lead to further damage to the emissions system.
5. How do I diagnose the P1477 code?
Start by inspecting the particulate matter sensor and its wiring for damage or loose connections. Use a multimeter to check for proper voltage at the circuit. Scanning with an advanced diagnostic tool can provide additional details.
6. How can I fix the P1477 code on my 2014 Silverado?
Repairs may involve replacing the particulate matter sensor, repairing damaged wiring or connectors, or updating the ECM software if necessary.
7. How much does it cost to repair the P1477 code on a 2014 Silverado?
Costs can vary, but replacing a particulate matter sensor typically ranges from $300 to $600, including parts and labor.
8. Can a dirty diesel particulate filter (DPF) cause the P1477 code?
A clogged DPF can indirectly cause issues by stressing the PM sensor, but the code specifically relates to the temperature circuit voltage, so the sensor or wiring is more likely the problem.
9. What tools are needed to troubleshoot the P1477 code?
You’ll need an OBDII scanner, a multimeter for voltage testing, and possibly a service manual for the Silverado to locate the circuit and sensor.
10. Is the P1477 code covered under warranty for a 2014 Silverado?
Depending on your vehicle's mileage and emissions warranty, the repair might be covered. Check with your dealership for specific warranty details.
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