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AutoCodes – Chevrolet – P119F 2017 Chevrolet Silverado

P119F 2017 Chevrolet Silverado 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 2017 Chevrolet Silverado 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 202
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P119F 2017 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 P119F 2017 Chevrolet Silverado - NOx Sensor 2 Signal Circuit High Voltage - AutoCodes.com
P119F 2017 Chevrolet Silverado Code - NOx Sensor 2 Signal Circuit High Voltage
What does this mean?

What are the Possible Causes of the DTC P119F 2017 Chevrolet Silverado?

  • 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 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 P119F 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 P119F 2017 Chevrolet Silverado code?

Need more information on how to fix the P119F 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P119F 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2017 Chevrolet Silverado Code

1. What does the OBDII code P119F mean on a 2017 Chevrolet Silverado?

Code P119F indicates a high voltage issue in the signal circuit of NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of code P119F in a 2017 Chevrolet Silverado?

Common symptoms include the check engine light being illuminated, reduced fuel efficiency, poor engine performance, and possibly a derate mode in severe cases.

3. What causes the P119F code to appear?

The code can be triggered by a faulty NOx Sensor 2, damaged wiring or connectors, excessive nitrogen oxide emissions, or an issue with the engine control module (ECM).

4. Can I drive my 2017 Chevrolet Silverado with the P119F code?

It is possible to drive with this code, but it’s not recommended as it may lead to reduced performance, higher emissions, and potential damage to the emissions system.

5. How do I diagnose the P119F code on my Silverado?

Start by inspecting the wiring and connectors for NOx Sensor 2, then use a scan tool to monitor sensor data. If necessary, test the sensor for proper voltage and resistance.

6. How do I fix the P119F code on a 2017 Chevrolet Silverado?

Common fixes include repairing or replacing damaged wiring, cleaning or replacing the NOx Sensor 2, and updating or reprogramming the ECM if required.

7. How much does it cost to repair the P119F code?

Repair costs can range from $200 to $700 depending on whether the issue involves wiring repairs, sensor replacement, or ECM updates.

8. Where is NOx Sensor 2 located on a 2017 Chevrolet Silverado?

NOx Sensor 2 is typically located downstream in the exhaust system, after the catalytic converter.

9. How can I prevent the P119F code from recurring?

Regular maintenance, including inspecting the exhaust system and sensors, and using high-quality fuel can help prevent this code from reappearing.

10. Will a faulty NOx Sensor 2 affect emissions testing?

Yes, a malfunctioning NOx Sensor 2 may cause your vehicle to fail emissions testing due to inaccurate monitoring of nitrogen oxide levels.

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