P1478 2017 Chevrolet Silverado Code - Particulate Matter Sensor Temperature 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
- P1478 2017 Chevrolet Silverado indicates Particulate Matter Sensor Temperature 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 P1478 2017 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 P1478 2017 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 P1478 2017 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 P1478 2017 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.
Need more information about the P1478 2017 Chevrolet Silverado code?
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Frequently Asked Questions about P1478 2017 Chevrolet Silverado Code
What does the OBDII code P1478 mean on a 2017 Chevrolet Silverado?
The P1478 code indicates a high voltage issue in the particulate matter sensor temperature circuit, which monitors exhaust gas temperature for proper diesel particulate filter (DPF) operation.
What are the symptoms of code P1478 on a 2017 Chevrolet Silverado?
Common symptoms include the check engine light turning on, reduced engine performance, increased fuel consumption, and potential DPF regeneration issues.
What causes the P1478 code to appear?
The code can be triggered by a faulty particulate matter sensor, damaged wiring or connectors in the sensor circuit, or issues with the vehicle's powertrain control module (PCM).
Can driving with the P1478 code damage my truck?
Continuing to drive with this code can lead to improper DPF function, which may cause excessive soot buildup, reduced engine efficiency, and potential engine or exhaust system damage.
How do I diagnose the P1478 code on my Silverado?
Start by inspecting the particulate matter sensor and its wiring for damage or loose connections. Use a multimeter to test the sensor's voltage and resistance. Scanning the PCM for additional codes may also help identify related issues.
How can I fix the P1478 code on a 2017 Chevrolet Silverado?
Repairs may include replacing the particulate matter sensor, repairing damaged wiring or connectors, or reprogramming/updating the PCM if necessary.
Is the P1478 code specific to diesel engines?
Yes, this code is specific to vehicles with diesel engines, as it relates to the particulate matter sensor used in diesel exhaust systems.
How much does it cost to repair the P1478 code?
Repair costs can vary but typically range from $200 to $600, depending on whether the sensor, wiring, or PCM needs repair or replacement.
Can I clear the P1478 code without fixing the problem?
Clearing the code without addressing the underlying issue will only temporarily turn off the check engine light, and the code is likely to return.
Do I need special tools to fix the P1478 code?
You may need a diagnostic scanner, a multimeter, and basic tools for inspecting and replacing the sensor or repairing wiring. Advanced tools may be required for PCM reprogramming.
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