P1477 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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.
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Frequently Asked Questions about P1477 2014 GMC Sierra Code
What does the OBDII code P1477 mean on a 2014 GMC Sierra?
P1477 indicates a problem with the particulate matter (PM) sensor temperature circuit, specifically a low voltage signal being detected.
What are common symptoms of code P1477 in a 2014 GMC Sierra?
Symptoms may include a check engine light, reduced fuel efficiency, decreased engine performance, and possible DPF (diesel particulate filter) regeneration issues.
What causes the P1477 code to appear?
Common causes include a faulty PM sensor, damaged wiring or connectors in the temperature circuit, a failed control module, or excessive soot buildup affecting the sensor.
Can I drive my 2014 GMC Sierra with the P1477 code?
While the truck may still be drivable, ignoring the code can lead to further damage to the DPF system, reduced efficiency, and higher repair costs.
How do I diagnose the P1477 code on my 2014 GMC Sierra?
Start by inspecting the PM sensor and its wiring for damage or disconnections. Use a multimeter to check for proper voltage and continuity in the circuit.
What tools are needed to diagnose and repair the P1477 code?
You’ll need an OBDII scanner, a multimeter, and possibly a service manual for your 2014 GMC Sierra to trace the wiring and sensor locations.
How do I fix the P1477 code on my 2014 GMC Sierra?
Repairs may include replacing the PM sensor, repairing damaged wiring, cleaning soot buildup, or reprogramming the control module if needed.
How much does it cost to repair code P1477?
Repair costs vary but can range from $200 to $600 or more, depending on whether the PM sensor needs replacement or additional repairs are required.
Can a dirty particulate matter sensor cause the P1477 code?
Yes, excessive soot or debris on the PM sensor can interfere with its operation and trigger a low voltage reading.
How can I prevent the P1477 code from recurring?
Regular maintenance of the DPF system, using high-quality fuel, and addressing check engine light codes promptly can help prevent this issue.
Discuss the causes and fixes for P1477 2014 GMC Sierra OBDII Code
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