P1474 2014 GMC Sierra 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 2014 GMC Sierra 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 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 P1474 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 P1474 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 P1474 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 P1474 2014 GMC Sierra Code
1. What does the OBDII code P1474 mean for a 2014 GMC Sierra?
P1474 indicates an issue with the Particulate Matter Sensor Electrode Supply Circuit, which monitors emissions by detecting soot levels in the exhaust system.
2. What are the common symptoms of code P1474 in a 2014 GMC Sierra?
Common symptoms include an illuminated check engine light, reduced engine performance, increased exhaust emissions, and possible difficulty passing emissions tests.
3. What causes the P1474 fault code in a GMC Sierra?
Causes can include a faulty particulate matter sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning powertrain control module (PCM).
4. Can driving with code P1474 damage my 2014 GMC Sierra?
Driving with this code may increase emissions and lead to long-term damage to the exhaust system if not addressed, but it typically doesn't cause immediate engine damage.
5. How do I diagnose the P1474 code on a 2014 GMC Sierra?
Diagnosis involves checking the particulate matter sensor, inspecting the wiring and connectors for damage, and using a scan tool to monitor sensor data and pinpoint the issue.
6. How can I fix the P1474 code on my GMC Sierra?
Repairs may include replacing the particulate matter sensor, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
7. How much does it cost to repair the P1474 code on a 2014 GMC Sierra?
Repair costs vary, but replacing the particulate matter sensor typically ranges from $300 to $600, depending on labor rates and parts pricing.
8. Can a dirty exhaust system cause the P1474 code?
Yes, excessive soot buildup in the exhaust system can affect the accuracy of the particulate matter sensor and trigger the P1474 code.
9. Is the P1474 code covered under warranty for a 2014 GMC Sierra?
It may be covered under the emissions warranty, depending on your vehicle's mileage and specific warranty terms. Contact your dealer to confirm.
10. Can I clear the P1474 code by disconnecting the battery?
Disconnecting the battery may temporarily clear the code, but it won’t fix the underlying issue. The code will likely return until the problem is properly addressed.
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