AutoCodes – Chevrolet – P119C 2018 Chevrolet Silverado

P119C 2018 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit High Voltage

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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: P119C 2018 Chevrolet Silverado indicates NOx Sensor 1 Signal Circuit High Voltage.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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.

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Code Popularity 225

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P119C 2018 Chevrolet Silverado Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P119C 2018 Chevrolet Silverado - NOx Sensor 1 Signal Circuit High Voltage - AutoCodes.com — P119C 2018 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119C 2018 Chevrolet Silverado?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P119C 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 P119C 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.

Need more information about the P119C 2018 Chevrolet Silverado code?

Need more information on how to fix the P119C 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P119C 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P119C in a 2018 Chevrolet Silverado related to the NOx Sensor 1 Signal Circuit High Voltage?

The common symptoms include the check engine light illuminating, reduced engine performance, and potentially increased fuel consumption.

2. What are the possible causes of the NOx Sensor 1 Signal Circuit High Voltage fault code (P119C) in a 2018 Chevrolet Silverado?

Potential causes include a faulty NOx sensor, wiring issues in the sensor circuit, a defective sensor heater, or issues with the powertrain control module (PCM).

3. How serious is the OBDII code P119C NOx Sensor 1 Signal Circuit High Voltage in a 2018 Chevrolet Silverado?

While the vehicle may still be operable with this fault, it is essential to address the issue promptly to prevent potential damage to the catalytic converter or other emission control components.

4. Can driving with the P119C code present cause further damage to the vehicle?

Continued driving with the fault code may lead to decreased fuel efficiency, increased emissions, and potential long-term damage to the vehicle's emission control system.

5. How can I diagnose and repair the NOx Sensor 1 Signal Circuit High Voltage issue in my 2018 Chevrolet Silverado?

Diagnosis typically involves checking the NOx sensor, inspecting the sensor circuit for any wiring faults, testing the sensor heater, and scanning the PCM for related error codes. Repair may involve replacing the sensor, repairing wiring, or addressing PCM issues.

6. Is it possible to reset the P119C code in a 2018 Chevrolet Silverado without addressing the underlying problem?

While clearing the code may temporarily turn off the check engine light, the issue causing the fault code will persist and may trigger the code again in the future.

7. Can a DIY enthusiast fix the NOx Sensor 1 Signal Circuit High Voltage problem in a 2018 Chevrolet Silverado?

Depending on your mechanical skills and access to tools, replacing the NOx sensor or addressing wiring issues may be doable for some DIY enthusiasts. However, diagnosing the precise cause may require professional equipment and expertise.

8. Are there any recalls or technical service bulletins related to the P119C code in a 2018 Chevrolet Silverado?

It's advisable to check with a Chevrolet dealership or online resources to see if there are any recalls or technical service bulletins related to the NOx Sensor 1 Signal Circuit High Voltage fault code in your specific vehicle.

9. How can regular maintenance help prevent the occurrence of the NOx Sensor 1 Signal Circuit High Voltage fault code in a 2018 Chevrolet Silverado?

Regular maintenance, including scheduled inspections and following the manufacturer's recommended service intervals, can help identify and address potential issues before they escalate into more significant problems like the P119C fault code.

10. Will fixing the NOx Sensor 1 Signal Circuit High Voltage fault code improve the overall performance and efficiency of a 2018 Chevrolet Silverado?

Addressing the underlying issue causing the fault code can lead to improved engine performance, better fuel efficiency, and reduced emissions, contributing to the overall health and efficiency of your vehicle.