AutoCodes – Chevrolet – P119F Chevrolet

P119F Chevrolet Code - NOx Sensor 2 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 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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: P119F Chevrolet indicates NOx Sensor 2 Signal Circuit High Voltage.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 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 853

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

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 P119F Chevrolet 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 P119F Chevrolet - NOx Sensor 2 Signal Circuit High Voltage - AutoCodes.com — P119F Chevrolet Code - NOx Sensor 2 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119F Chevrolet?

Faulty Nitrogen Oxides (NOx) Sensor 2
Nitrogen Oxides Sensor 2 harness is open or shorted
Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P119F Chevrolet?

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 P119F Chevrolet 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 P119F Chevrolet code?

Need more information on how to fix the P119F Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P119F Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P119F 2014 Chevrolet Silverado — NOx Sensor 2 Signal Circuit High Voltage
P119F 2015 Chevrolet Silverado — NOx Sensor 2 Signal Circuit High Voltage
P119F 2016 Chevrolet Silverado — NOx Sensor 2 Signal Circuit High Voltage
P119F 2017 Chevrolet Silverado — NOx Sensor 2 Signal Circuit High Voltage
P119F 2018 Chevrolet Silverado — NOx Sensor 2 Signal Circuit High Voltage

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 P119F Chevrolet Code

1. What are the common symptoms of OBDII code P119F related to NOx Sensor 2 Signal Circuit High Voltage?

The common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P119F in a Chevrolet vehicle?

The code P119F could be triggered by issues such as a faulty NOx sensor, wiring or connector problems, exhaust system leaks, or a malfunctioning engine control module (ECM).

3. How can I diagnose the NOx Sensor 2 Signal Circuit High Voltage issue in my Chevrolet?

To diagnose the problem, you can perform a visual inspection of the sensor and its wiring, use an OBDII scanner to retrieve the specific fault code, and conduct voltage and resistance tests on the sensor and related components.

4. What are the potential risks of driving with OBDII code P119F active in my Chevrolet?

Continuing to drive with the code P119F present can lead to increased emissions, potential damage to the catalytic converter, and ultimately affect the overall performance of the vehicle.

5. Can I repair OBDII code P119F related to NOx Sensor 2 Signal Circuit High Voltage myself?

While some DIY enthusiasts may attempt to address this issue, it is recommended to seek professional help due to the complexity of diagnosing and repairing NOx sensor and circuit problems.

6. How much does it typically cost to repair OBDII code P119F in a Chevrolet?

The cost of repairing OBDII code P119F can vary depending on the exact cause of the issue, but it may range from $200 to $600 including parts and labor.

7. Is it necessary to replace the NOx sensor when dealing with code P119F?

In many cases, replacing the NOx sensor is the most effective solution to resolve code P119F, especially if the sensor is found to be faulty or damaged during diagnosis.

8. Can a faulty NOx sensor cause other issues in a Chevrolet vehicle?

Yes, a faulty NOx sensor can lead to poor engine performance, failed emissions tests, increased fuel consumption, and potential damage to other emission control components.

9. Are there any maintenance tips to prevent OBDII code P119F from recurring in my Chevrolet?

Regularly inspecting and maintaining the exhaust system, ensuring proper fuel quality, and addressing any engine performance issues promptly can help prevent the recurrence of code P119F.

10. How long does it typically take to repair OBDII code P119F related to NOx Sensor 2 Signal Circuit High Voltage?

The repair process for code P119F can usually be completed within a few hours, but the exact duration may vary based on the specific diagnostic and repair steps required.