P1476 2014 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 2014 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 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 P1476 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 P1476 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 P1476 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 P1476 2014 GMC Sierra Code
1. What does the OBDII code P1476 mean on a 2014 GMC Sierra?
The code P1476 indicates a high voltage issue in the particulate matter sensor's electrode supply circuit, which monitors the diesel particulate filter (DPF) system.
2. What are the common symptoms of code P1476 in a 2014 GMC Sierra?
Symptoms may include an illuminated check engine light, reduced engine performance, increased fuel consumption, and possible DPF regeneration issues.
3. What causes the P1476 code to appear on a 2014 GMC Sierra?
Common causes include a faulty particulate matter sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).
4. Can I drive my 2014 GMC Sierra with a P1476 code?
While the vehicle may still be drivable, prolonged operation with this code can lead to further damage to the DPF system and reduced engine performance.
5. How is the P1476 code diagnosed on a 2014 GMC Sierra?
A mechanic will use a scan tool to confirm the code, inspect the particulate matter sensor and its wiring, and test the sensor’s voltage levels to pinpoint the issue.
6. How do I fix the P1476 code on my 2014 GMC Sierra?
Repairs may involve replacing the particulate matter sensor, repairing damaged wiring or connectors, or updating/reprogramming the ECM if necessary.
7. How much does it cost to fix a P1476 code on a 2014 GMC Sierra?
Repair costs vary but typically range from $200 to $600, depending on whether the sensor, wiring, or ECM needs replacement or repair.
8. Can a dirty diesel particulate filter cause the P1476 code?
While a clogged DPF may not directly trigger this code, it can lead to related problems that affect the particulate matter sensor’s performance.
9. How can I prevent the P1476 code from occurring on my 2014 GMC Sierra?
Regular maintenance, timely DPF cleaning or regeneration, and ensuring the particulate matter sensor and wiring are in good condition can help prevent this code.
10. Will clearing the P1476 code fix the problem on my 2014 GMC Sierra?
Clearing the code may turn off the check engine light temporarily, but the underlying issue must be resolved to prevent the code from returning.
Discuss the causes and fixes for P1476 2014 GMC Sierra OBDII Code
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