AutoCodes – GMC – P119F 2015 GMC Sierra

P119F 2015 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 2015 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.

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Code Popularity 160

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 2015 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 2015 GMC Sierra - NOx Sensor 2 Signal Circuit High Voltage - AutoCodes.com — P119F 2015 GMC Sierra Code - NOx Sensor 2 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119F 2015 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 2015 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 2015 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 2015 GMC Sierra code?

Need more information on how to fix the P119F 2015 GMC Sierra 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 P119F 2015 GMC Sierra Code

1. What does the OBDII code P119F mean on a 2015 GMC Sierra?

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 common symptoms of code P119F on a 2015 GMC Sierra?

Symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, and possibly the vehicle entering limp mode.

3. What causes the P119F code to appear?

Common causes include a faulty NOx Sensor 2, damaged wiring or connectors in the sensor circuit, a failed exhaust system component, or issues with the ECM.

4. Where is NOx Sensor 2 located on a 2015 GMC Sierra?

NOx Sensor 2 is typically located downstream in the exhaust system, near or after the selective catalytic reduction (SCR) system.

5. Can a faulty NOx Sensor 2 cause the P119F code?

Yes, a malfunctioning NOx Sensor 2 is a primary cause of this code, often due to sensor wear or contamination.

6. How is the P119F code diagnosed?

Technicians use a scan tool to confirm the code, inspect the NOx Sensor 2 and its wiring for damage, and test the sensor's voltage and resistance levels.

7. Can I drive with the P119F code on my 2015 GMC Sierra?

While you can drive short distances, prolonged driving may lead to reduced performance, increased emissions, or damage to the exhaust system.

8. How much does it cost to fix the P119F code?

Repair costs vary but typically include $200-$600 for a replacement NOx sensor, plus labor charges if professional diagnosis and installation are required.

9. Can a software update resolve the P119F code?

In some cases, a reprogramming or update to the engine control module (ECM) may resolve the issue if itâ€™s related to software errors.

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

Regular maintenance of the exhaust system, using high-quality fuel, and addressing any related issues promptly can help prevent this code from reappearing.