P1474 2018 Chevrolet Silverado Code - Particulate Matter Sensor Electrode Supply Circuit
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
- P1474 2018 Chevrolet Silverado indicates Particulate Matter Sensor Electrode Supply Circuit.
- 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 P1474 2018 Chevrolet Silverado 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 P1474 2018 Chevrolet Silverado?
- 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 P1474 2018 Chevrolet Silverado?
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 P1474 2018 Chevrolet Silverado 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 P1474 2018 Chevrolet Silverado Code
1. What does the OBDII code P1474 mean on a 2018 Chevrolet Silverado?
P1474 indicates an issue with the Particulate Matter Sensor Electrode Supply Circuit, which monitors soot levels in the exhaust system.
2. What are the common symptoms of code P1474 on a 2018 Silverado?
Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, and possible DPF (Diesel Particulate Filter) regeneration issues.
3. What causes the P1474 code to appear on a 2018 Chevrolet Silverado?
Common causes include a faulty particulate matter sensor, wiring or connector issues in the sensor circuit, or a malfunctioning ECM (Engine Control Module).
4. How do I diagnose the P1474 code on my Silverado?
Start by scanning for additional trouble codes, inspecting the particulate matter sensor and its wiring for damage or disconnections, and testing the sensor circuit for proper voltage.
5. Can I drive my 2018 Chevrolet Silverado with the P1474 code?
Driving with this code is not recommended, as it may lead to further damage to the DPF system and reduced engine efficiency.
6. How do I fix the P1474 code on a 2018 Silverado?
Repairs may include replacing the particulate matter sensor, repairing damaged wiring, or updating the ECM software if needed.
7. How much does it cost to fix the P1474 code on a Chevrolet Silverado?
Costs can vary, but replacing a particulate matter sensor typically ranges from $200 to $500, including parts and labor.
8. Will clearing the code solve the P1474 issue permanently?
Clearing the code without addressing the underlying issue will only temporarily turn off the check engine light, and the code will likely return.
9. What tools are needed to troubleshoot the P1474 code?
You’ll need an OBDII scanner, a multimeter to test electrical connections, and possibly a wiring diagram for your Silverado.
10. Is the P1474 code a serious problem for my Silverado?
Yes, if left unresolved, it can lead to DPF clogging, increased emissions, and potential engine performance issues. Prompt diagnosis and repair are recommended.
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