AutoCodes – Chevrolet – P119E Chevrolet

P119E Chevrolet 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 Chevrolet 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 538

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

What does this mean?

What are the Possible Causes of the DTC P119E Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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Information for Specific Chevrolet Models

P119E 2014 Chevrolet Silverado — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2015 Chevrolet Silverado — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2016 Chevrolet Silverado — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2017 Chevrolet Silverado — NOx Sensor 2 Signal Circuit Low Voltage
P119E 2018 Chevrolet Silverado — 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 Chevrolet Code

1. What does the OBDII code P119E mean on a Chevrolet?

P119E indicates a "NOx Sensor 2 Signal Circuit Low Voltage," which means the second nitrogen oxide (NOx) sensor is detecting a lower-than-expected voltage signal.

2. What are the symptoms of a P119E code on a Chevrolet?

Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, and potential issues with emissions compliance.

3. What causes the P119E code to appear on a Chevrolet?

Common causes include a faulty NOx sensor, damaged sensor wiring or connectors, excessive soot buildup on the sensor, or a malfunctioning engine control module (ECM).

4. Can I drive my Chevrolet with a P119E code?

While the vehicle may still be drivable, it is not recommended as it may lead to increased emissions, reduced performance, and potential damage to the catalytic converter over time.

5. How do I diagnose the P119E code on my Chevrolet?

Begin by inspecting the NOx sensor and its wiring for damage or corrosion, checking for loose connections, and using a scan tool to monitor live sensor data for irregular readings.

6. How do I fix the P119E code on a Chevrolet?

Possible fixes include replacing the faulty NOx sensor, repairing or replacing damaged wiring or connectors, cleaning soot buildup, or reprogramming/updating the ECM.

7. How much does it cost to repair the P119E code on a Chevrolet?

Repair costs vary but typically range from $200 to $600, depending on whether the NOx sensor needs replacement or if wiring repairs are required.

8. Can a bad NOx sensor cause other problems in my Chevrolet?

Yes, a faulty NOx sensor can lead to poor engine performance, increased emissions, and potential damage to the exhaust system, including the catalytic converter.

9. How often should a NOx sensor be replaced on a Chevrolet?

NOx sensors generally last 50,000 to 100,000 miles, but early failures can occur due to soot buildup or electrical issues.

10. Is a P119E code covered under warranty for my Chevrolet?

Depending on your vehicle's age and mileage, the NOx sensor may be covered under the emissions warranty. Check with your Chevrolet dealer for specific warranty coverage.