AutoCodes – GMC – P119F 2017 GMC Sierra

P119F 2017 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 2017 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 152

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 2017 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 2017 GMC Sierra - NOx Sensor 2 Signal Circuit High Voltage - AutoCodes.com — P119F 2017 GMC Sierra Code - NOx Sensor 2 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119F 2017 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 2017 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 2017 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 2017 GMC Sierra code?

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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 2017 GMC Sierra Code

1. What does the OBDII code P119F mean on a 2017 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 a P119F code on a 2017 GMC Sierra?

Symptoms may include the check engine light turning on, reduced fuel efficiency, increased emissions, or the vehicle entering limp mode.

3. What causes the P119F code on a 2017 GMC Sierra?

Common causes include a faulty NOx Sensor 2, damaged wiring or connectors in the sensor circuit, or issues with the vehicle's ECM (engine control module).

4. Can I drive my 2017 GMC Sierra with a P119F code?

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

5. How do you diagnose the P119F code on a 2017 GMC Sierra?

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

6. How do you fix the P119F code on a 2017 GMC Sierra?

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

7. What is NOx Sensor 2 on a 2017 GMC Sierra?

NOx Sensor 2 is a part of the emissions control system that measures nitrogen oxide levels downstream in the exhaust system to help regulate emissions.

8. How much does it cost to repair a P119F code on a 2017 GMC Sierra?

Repair costs can vary, but replacing a NOx sensor typically ranges from $300 to $600, including parts and labor. Wiring repairs may cost less.

9. Can a dirty or clogged exhaust system cause the P119F code?

While less common, excessive soot or buildup in the exhaust system can contribute to sensor issues and trigger this code.

10. Does the P119F code require reprogramming the ECM on a 2017 GMC Sierra?

Reprogramming the ECM may be required if the issue is related to outdated software or incorrect parameter settings. A professional diagnosis is recommended.