AutoCodes – GMC – P119F GMC

P119F GMC 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 GMC 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 524

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

What does this mean?

What are the Possible Causes of the DTC P119F GMC?

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 GMC?

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 GMC 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 GMC code?

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

Need Help with the Code?

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

Information for Specific GMC Models

P119F 2014 GMC Sierra — NOx Sensor 2 Signal Circuit High Voltage
P119F 2015 GMC Sierra — NOx Sensor 2 Signal Circuit High Voltage
P119F 2016 GMC Sierra — NOx Sensor 2 Signal Circuit High Voltage
P119F 2017 GMC Sierra — NOx Sensor 2 Signal Circuit High Voltage
P119F 2018 GMC Sierra — 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 GMC Code

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

- Common symptoms include poor engine performance, reduced fuel efficiency, illuminated Check Engine Light, and potential difficulty passing emissions tests.

2. What are the possible causes of OBDII code P119F GMC related to NOx Sensor 2 Signal Circuit High Voltage?

- Possible causes include a faulty NOx sensor, wiring issues in the sensor circuit, exhaust leaks, or problems with the engine control module.

3. How can I diagnose the OBDII code P119F GMC for NOx Sensor 2 Signal Circuit High Voltage?

- Diagnosing the code typically involves using an OBDII scanner to retrieve the fault code, inspecting the NOx sensor and its wiring, and performing voltage tests to identify the issue.

4. Can I continue driving my vehicle with OBDII code P119F GMC triggered for NOx Sensor 2 Signal Circuit High Voltage?

- It is generally not recommended to continue driving with this code as it can lead to further damage to the vehicle and may cause it to fail emissions tests.

5. How can I repair OBDII code P119F GMC for NOx Sensor 2 Signal Circuit High Voltage?

- Repair options may include replacing the NOx sensor, repairing or replacing damaged wiring, fixing exhaust leaks, or reprogramming the engine control module.

6. Are there any DIY tips for addressing OBDII code P119F GMC related to NOx Sensor 2 Signal Circuit High Voltage?

- DIY tips include checking for visible damage to wiring, ensuring the sensor is securely connected, and using a multimeter to test the sensor's voltage output.

7. Will resetting the Check Engine Light resolve OBDII code P119F GMC for NOx Sensor 2 Signal Circuit High Voltage?

- Resetting the light may temporarily turn it off, but the underlying issue causing the code will still need to be diagnosed and repaired to prevent the light from coming back on.

8. How much does it typically cost to fix OBDII code P119F GMC for NOx Sensor 2 Signal Circuit High Voltage?

- The cost can vary depending on the specific cause of the code, but repairs for this issue may range from $200 to $500 or more, including parts and labor.

9. Is OBDII code P119F GMC related to NOx Sensor 2 Signal Circuit High Voltage a common issue in GMC vehicles?

- While not as common as some other codes, issues with NOx sensors and their circuits can occur in GMC vehicles, especially in models equipped with emissions control systems.

10. Can a malfunctioning NOx sensor impact the overall performance and emissions of my vehicle?

- Yes, a malfunctioning NOx sensor can lead to decreased engine performance, increased emissions output, and potential failure to meet emissions standards set by regulatory authorities.