AutoCodes – GMC – P119D 2014 GMC Sierra

P119D 2014 GMC Sierra Code - NOx Sensor 2 Signal Circuit

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: P119D 2014 GMC Sierra indicates NOx Sensor 2 Signal Circuit.
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 174

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 P119D 2014 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 P119D 2014 GMC Sierra - NOx Sensor 2 Signal Circuit - AutoCodes.com — P119D 2014 GMC Sierra Code - NOx Sensor 2 Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P119D 2014 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 P119D 2014 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 P119D 2014 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 P119D 2014 GMC Sierra 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 P119D 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P119D in a 2014 GMC Sierra related to the NOx Sensor 2 Signal Circuit?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P119D in a 2014 GMC Sierra indicating an issue with NOx Sensor 2 Signal Circuit?

- Possible causes include a faulty NOx sensor, wiring issues, a failed sensor heater, or a problem with the engine control module (ECM).

3. How can I diagnose the NOx Sensor 2 Signal Circuit issue causing OBDII code P119D in my 2014 GMC Sierra?

- Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the sensor and its wiring for damage, and testing the sensor's functionality.

4. Is it safe to continue driving my 2014 GMC Sierra with OBDII code P119D related to the NOx Sensor 2 Signal Circuit issue?

- It is not recommended to drive the vehicle with this code as it can lead to poor engine performance and potentially cause further damage.

5. Can I reset the check engine light after repairing the NOx Sensor 2 Signal Circuit issue in my 2014 GMC Sierra?

- Yes, once the issue is resolved, you can reset the check engine light with an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

6. What are some repair tips for fixing OBDII code P119D in a 2014 GMC Sierra associated with NOx Sensor 2 Signal Circuit malfunction?

- Repair tips may include checking for loose or damaged wiring, replacing the NOx sensor if necessary, and ensuring proper connections and sensor operation.

7. How much does it cost to repair the NOx Sensor 2 Signal Circuit issue causing OBDII code P119D in a 2014 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve replacing the sensor, repairing wiring, or addressing ECM problems.

8. Can a DIY enthusiast fix the NOx Sensor 2 Signal Circuit problem triggering OBDII code P119D in a 2014 GMC Sierra?

- While some DIYers may be able to address simpler issues like checking wiring connections, diagnosing and repairing NOx sensor problems may require professional expertise.

9. How often should the NOx sensor be replaced in a 2014 GMC Sierra to prevent OBDII code P119D related to the NOx Sensor 2 Signal Circuit?

- The NOx sensor typically has a long lifespan, but if issues arise, it should be replaced promptly to avoid triggering the OBDII code and potential engine performance issues.

10. Is it necessary to visit a dealership for repairs related to OBDII code P119D in a 2014 GMC Sierra linked to the NOx Sensor 2 Signal Circuit?

- While a dealership may have specialized knowledge and equipment, qualified independent mechanics can also effectively diagnose and repair NOx sensor circuit issues in a 2014 GMC Sierra.