AutoCodes – GMC – P119E GMC

P119E GMC Code - NOx Sensor 2 Signal Circuit Low 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: P119E GMC indicates NOx Sensor 2 Signal Circuit Low 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 366

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P119E 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 P119E GMC - NOx Sensor 2 Signal Circuit Low Voltage - AutoCodes.com — P119E GMC Code - NOx Sensor 2 Signal Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P119E 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 P119E 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 P119E 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 P119E GMC code?

Need more information on how to fix the P119E GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P119E 2014 GMC Sierra — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2015 GMC Sierra — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2016 GMC Sierra — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2017 GMC Sierra — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2018 GMC Sierra — NOx Sensor 2 Signal Circuit Low 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 P119E GMC Code

1. What are common symptoms of OBDII code P119E GMC (NOx Sensor 2 Signal Circuit Low Voltage)?

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

2. What can cause the OBDII code P119E GMC to trigger?

- The code P119E GMC is triggered when the NOx Sensor 2 signal circuit detects a low voltage condition, which can be caused by issues such as wiring faults, sensor malfunction, or a faulty NOx sensor.

3. How can I diagnose the cause of OBDII code P119E GMC?

- Diagnosing the cause of P119E GMC involves inspecting the wiring harness for damage, testing the NOx sensor's voltage output, and checking for any corrosion or loose connections.

4. Can I continue driving my vehicle with OBDII code P119E GMC?

- It is not recommended to drive the vehicle with an active P119E GMC code, as it can lead to further damage and potential safety hazards. It is best to address the issue promptly.

5. What are the repair options for OBDII code P119E GMC?

- Repair options include replacing the NOx sensor, repairing any damaged wiring, resetting the fault code, and ensuring proper connections to resolve the low voltage signal issue.

6. How much does it typically cost to repair OBDII code P119E GMC?

- The cost of repairing P119E GMC can vary depending on the extent of the issue, the need for parts replacement, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.

7. Can a DIY enthusiast fix OBDII code P119E GMC at home?

- While some DIY enthusiasts may be able to diagnose and address simple wiring issues related to P119E GMC, it is recommended to seek professional help for accurate diagnosis and repair of NOx sensor-related problems.

8. Are there any preventative measures to avoid OBDII code P119E GMC in the future?

- Regular vehicle maintenance, including checking and cleaning sensor connections, inspecting wiring harnesses, and using quality fuel, can help prevent issues that may trigger the P119E GMC code.

9. How urgent is it to address OBDII code P119E GMC?

- It is recommended to address the P119E GMC code promptly to avoid potential damage to the vehicle's emissions system, engine performance, and overall drivability.

10. Can a faulty NOx sensor cause other problems besides triggering OBDII code P119E GMC?

- Yes, a faulty NOx sensor can lead to issues such as increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter if left unresolved.