P1477 2017 GMC Sierra 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 2017 GMC Sierra 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 2017 GMC Sierra 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 2017 GMC Sierra?
- 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 2017 GMC Sierra?
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 2017 GMC Sierra 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 P1477 2017 GMC Sierra code?
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Frequently Asked Questions about P1477 2017 GMC Sierra Code
What does the OBDII code P1477 mean on a 2017 GMC Sierra?
P1477 indicates an issue with the particulate matter (PM) sensor temperature circuit, specifically detecting low voltage input.
What are the symptoms of code P1477 on a 2017 GMC Sierra?
Common symptoms include the check engine light turning on, potential reduction in engine performance, and possible issues with the diesel particulate filter (DPF) regeneration process.
What causes the P1477 code to appear?
This code is often caused by a faulty PM sensor, damaged wiring, poor electrical connections, or a malfunctioning engine control module (ECM).
Can I drive my 2017 GMC Sierra with the P1477 code?
Driving with this code may be possible, but it is not recommended as it can lead to further damage to the emissions system or affect engine performance over time.
How do I diagnose the P1477 code?
Diagnosis involves checking the PM sensor and its wiring for damage, using a multimeter to test voltage levels, and inspecting the ECM for faults.
What tools are needed to fix the P1477 code?
Basic tools include an OBDII scanner, a multimeter for voltage testing, and possibly replacement parts like a new PM sensor or wiring harness.
How much does it cost to fix the P1477 code on a 2017 GMC Sierra?
Repair costs vary but typically range from $150 to $500, depending on whether the issue is with the sensor, wiring, or ECM.
Can a faulty PM sensor cause other issues?
Yes, a malfunctioning PM sensor can prevent proper DPF regeneration, leading to soot buildup and reduced engine efficiency.
How do I prevent the P1477 code from reoccurring?
Regular maintenance, inspecting wiring for damage, and promptly addressing any issues with the emissions system can help prevent this code from returning.
Does the P1477 code affect emissions testing?
Yes, this code can cause your vehicle to fail emissions testing due to improper monitoring of particulate matter emissions.
Discuss the causes and fixes for P1477 2017 GMC Sierra OBDII Code
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