AutoCodes.com
Login with Google
AutoCodes – GMC – P119F 2016 GMC Sierra

P119F 2016 GMC Sierra 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 2016 GMC Sierra 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.
Save to My Repairs My Repairs
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 154
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P119F 2016 GMC Sierra 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 2016 GMC Sierra - NOx Sensor 2 Signal Circuit High Voltage - AutoCodes.com
P119F 2016 GMC Sierra Code - NOx Sensor 2 Signal Circuit High Voltage
What does this mean?

What are the Possible Causes of the DTC P119F 2016 GMC Sierra?

  • 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 2016 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 P119F 2016 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.

Need more information about the P119F 2016 GMC Sierra code?

Need more information on how to fix the P119F 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P119F 2016 GMC Sierra 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 2016 GMC Sierra Code

1. What does the OBDII code P119F mean on a 2016 GMC Sierra?

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

2. What are the common symptoms of code P119F in a 2016 GMC Sierra?

Common symptoms include the Check Engine Light turning on, reduced fuel efficiency, poor engine performance, and possible activation of limp mode.

3. What causes the P119F code to appear on a 2016 GMC Sierra?

This code can be triggered by a faulty NOx Sensor 2, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

4. Can I drive my 2016 GMC Sierra with code P119F?

It is not recommended to drive for extended periods with this code active, as it may lead to increased emissions, poor performance, and potential damage to the exhaust system.

5. How do I diagnose the P119F code on a 2016 GMC Sierra?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the wiring and connectors for damage, and testing the NOx Sensor 2 for proper operation.

6. What are the repair options for code P119F on a 2016 GMC Sierra?

Repairs may include replacing the NOx Sensor 2, repairing damaged wiring or connectors, and updating or reprogramming the ECM if necessary.

7. How much does it cost to fix the P119F code on a 2016 GMC Sierra?

Repair costs can vary but typically range from $300 to $800, depending on whether the NOx sensor or wiring needs replacement.

8. Can a bad NOx Sensor 2 cause other problems in my 2016 GMC Sierra?

Yes, a faulty NOx Sensor 2 can lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time.

9. How often should NOx sensors be replaced on a 2016 GMC Sierra?

NOx sensors typically last 80,000 to 100,000 miles, but premature failure can occur due to contamination or electrical issues.

10. Will clearing the code reset the P119F issue on a 2016 GMC Sierra?

Clearing the code may temporarily turn off the Check Engine Light, but if the underlying issue isn’t fixed, the code will return.

Discuss the causes and fixes for P119F 2016 GMC Sierra OBDII Code

Submit a New Comment

Code P119F 2016 GMC Sierra comments

No comments found for this page.

AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play