P1477 2015 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 2015 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 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code
1. What does the OBDII code P1477 mean on a 2015 GMC Sierra?
P1477 indicates a low voltage issue in the particulate matter (PM) sensor temperature circuit, which monitors the temperature of the PM sensor in the exhaust system.
2. What are the common symptoms of P1477 on a 2015 GMC Sierra?
Symptoms may include the check engine light turning on, reduced fuel efficiency, abnormal exhaust readings, or issues with the vehicle's emissions system.
3. What causes the P1477 code on a 2015 GMC Sierra?
Common causes include a faulty PM sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).
4. Can I drive my 2015 GMC Sierra with the P1477 code?
Driving with this code is possible but not recommended, as it could lead to further damage to the emissions system or reduced performance over time.
5. How can I diagnose the P1477 code on a 2015 GMC Sierra?
Start by inspecting the PM sensor, wiring, and connectors for damage or corrosion. Use a multimeter to check for proper voltage in the circuit and verify sensor functionality.
6. How do I fix the P1477 code on a 2015 GMC Sierra?
Repairs may involve replacing the PM sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ECM if necessary.
7. How much does it cost to repair the P1477 code on a 2015 GMC Sierra?
The repair cost varies depending on the issue, but replacing the PM sensor can range from $200 to $500, while wiring repairs may be less expensive.
8. Can the P1477 code cause emissions test failure on a 2015 GMC Sierra?
Yes, this code can lead to emissions system malfunction and cause your vehicle to fail an emissions test.
9. Is the PM sensor part of the diesel particulate filter system on the 2015 GMC Sierra?
Yes, the PM sensor works alongside the diesel particulate filter system to monitor and manage exhaust emissions.
10. Do I need professional help to fix the P1477 code on a 2015 GMC Sierra?
While some issues like checking wiring can be done by DIY enthusiasts, sensor replacement or ECM reprogramming may require assistance from a professional mechanic.
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