P1475 2018 GMC Sierra Code - Particulate Matter Sensor Electrode Supply 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
- P1475 2018 GMC Sierra indicates Particulate Matter Sensor Electrode Supply 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 P1475 2018 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 P1475 2018 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 P1475 2018 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 P1475 2018 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 P1475 2018 GMC Sierra Code
1. What does the OBDII code P1475 mean on a 2018 GMC Sierra?
P1475 indicates a low voltage issue in the particulate matter sensor electrode supply circuit, which is part of the emissions control system.
2. What are the symptoms of code P1475 in a 2018 GMC Sierra?
Common symptoms include the check engine light turning on, decreased fuel efficiency, potential reduction in engine performance, and possible emissions test failure.
3. What causes the P1475 code to appear on a GMC Sierra?
Causes can include damaged wiring or connectors in the particulate matter sensor circuit, a faulty particulate matter sensor, a failing ECM (engine control module), or a low-voltage issue in the sensor supply.
4. How do I diagnose the P1475 code on my 2018 GMC Sierra?
Use an OBDII scanner to confirm the code, visually inspect the sensor and wiring for damage or corrosion, and test the sensor circuit voltage with a multimeter.
5. Can I drive my 2018 GMC Sierra with a P1475 code?
While the truck may still be drivable, prolonged use with this code can lead to increased emissions and potential damage to the emissions system.
6. How do I fix the P1475 code on a GMC Sierra?
Repairs may include replacing damaged wiring or connectors, replacing the particulate matter sensor, or reprogramming or replacing the ECM if necessary.
7. How much does it cost to fix the P1475 code on a 2018 GMC Sierra?
Repair costs can range from $100 for wiring repairs to $500 or more if the particulate matter sensor or ECM needs replacement.
8. Can a dead battery cause the P1475 code?
A severely discharged or failing battery can cause low voltage issues, potentially triggering the P1475 code.
9. Will clearing the code P1475 fix the problem on a GMC Sierra?
Clearing the code may temporarily remove the check engine light, but the underlying issue must be diagnosed and repaired to prevent the code from returning.
10. Is the P1475 code related to the diesel particulate filter (DPF) in a GMC Sierra?
Yes, the particulate matter sensor is part of the DPF system, which monitors soot levels and ensures proper operation of the emissions system.
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