P1477 2016 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 2016 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 2016 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 2016 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 2016 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 2016 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 2016 GMC Sierra Code
1. What does the OBDII code P1477 mean on a 2016 GMC Sierra?
P1477 indicates a problem in the particulate matter (PM) sensor temperature circuit, specifically low voltage being detected.
2. What are the common symptoms of code P1477 in a 2016 GMC Sierra?
Symptoms include an illuminated check engine light, decreased fuel efficiency, possible loss of power, and issues with the diesel particulate filter (DPF) system.
3. What causes the P1477 code to appear on a 2016 GMC Sierra?
Common causes include a faulty PM sensor, damaged wiring or connectors in the sensor circuit, or a failed engine control module (ECM).
4. Can I drive my 2016 GMC Sierra with the P1477 code?
While the vehicle may still be drivable, ignoring the code can lead to further damage to the DPF system and reduced engine performance.
5. How do I diagnose the P1477 code on a 2016 GMC Sierra?
Start by checking the PM sensor wiring and connectors for damage or corrosion, then test the sensor voltage and resistance using a multimeter.
6. How do you fix the P1477 code on a 2016 GMC Sierra?
Repairs may include replacing the particulate matter sensor, repairing damaged wiring, cleaning connectors, or, in rare cases, reprogramming or replacing the ECM.
7. How much does it cost to fix the P1477 code on a 2016 GMC Sierra?
Repair costs vary but typically range from $200 to $600, depending on whether the PM sensor or wiring needs replacement.
8. Can a dirty DPF cause the P1477 code on a 2016 GMC Sierra?
A clogged or malfunctioning DPF can indirectly cause sensor issues, but the code specifically points to an electrical problem with the PM sensor circuit.
9. How can I prevent the P1477 code from recurring on my 2016 GMC Sierra?
Regular maintenance of the DPF system, inspecting wiring for damage, and using quality diesel fuel can help prevent sensor-related issues.
10. Does the P1477 code require a software update for the 2016 GMC Sierra?
In some cases, a software update for the ECM may be necessary if the issue is related to incorrect sensor readings or communication errors.
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