P1476 2015 GMC Sierra Code - Particulate Matter Sensor Electrode Supply Circuit High 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
- P1476 2015 GMC Sierra indicates Particulate Matter Sensor Electrode Supply Circuit High 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 P1476 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 P1476 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 P1476 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 P1476 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 P1476 2015 GMC Sierra Code
1. What does OBDII code P1476 mean on a 2015 GMC Sierra?
P1476 indicates an issue with the particulate matter sensor electrode supply circuit, specifically detecting a high voltage condition.
2. What are the common symptoms of code P1476 on a 2015 GMC Sierra?
Symptoms may include the check engine light turning on, reduced engine performance, poor fuel economy, or issues with the diesel particulate filter (DPF).
3. What causes code P1476 on a 2015 GMC Sierra?
Common causes include a faulty particulate matter sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning Engine Control Module (ECM).
4. Can a dirty diesel particulate filter trigger code P1476?
No, P1476 is related to the particulate matter sensor's electrode supply circuit and not directly caused by the condition of the DPF itself.
5. How is code P1476 diagnosed on a 2015 GMC Sierra?
A technician will use a scan tool to confirm the code, inspect the wiring and connectors for damage, test the particulate matter sensor, and ensure the ECM is functioning correctly.
6. Can I drive my 2015 GMC Sierra with code P1476 active?
It is not recommended to drive for an extended period, as this code may result in improper DPF operation, leading to further engine or emissions-related issues.
7. How do you fix code P1476 on a 2015 GMC Sierra?
Repairs may include replacing the particulate matter sensor, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.
8. What tools are needed to troubleshoot code P1476?
Tools include an OBDII scanner, multimeter for checking voltage and continuity, and possibly a wiring diagram for the particulate matter sensor circuit.
9. Is code P1476 covered under the emissions warranty for a 2015 GMC Sierra?
This depends on your vehicle’s mileage and local warranty regulations, but emissions-related components like the particulate matter sensor may be covered under extended warranties.
10. What happens if code P1476 is ignored?
Ignoring this code could lead to further engine or emissions system damage, including DPF failure, decreased performance, and potential regulatory fines for excessive emissions.
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