AutoCodes.com
Login with Google
AutoCodes – Chevrolet – P119E 2018 Chevrolet Silverado

P119E 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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.
Save to My Repairs My Repairs
AI answers can be wrong. Verify repairs with testing. Open full chat
Code Popularity 238
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
💬 Need more help? Ask Coddy for instant answers — it's free!

Code P119E 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - NOx Sensor 2 Signal Circuit Low Voltage - AutoCodes.com
P119E 2018 Chevrolet Silverado Code - NOx Sensor 2 Signal Circuit Low Voltage
What does this mean?

What are the Possible Causes of the DTC P119E 2018 Chevrolet Silverado?

  • 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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P119E 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P119E 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2018 Chevrolet Silverado Code

1. What does the OBDII code P119E mean on a 2018 Chevrolet Silverado?

The P119E code indicates a "NOx Sensor 2 Signal Circuit Low Voltage," meaning the second NOx sensor is detecting a voltage lower than expected in its signal circuit.

2. What are the common symptoms of a P119E code on a 2018 Silverado?

Common symptoms include the check engine light turning on, decreased engine performance, increased emissions, and possible issues with fuel efficiency.

3. What causes the P119E code to appear on a 2018 Chevrolet Silverado?

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

4. Can I drive my 2018 Silverado with a P119E code?

While the vehicle may still be drivable, ignoring the P119E code can lead to reduced fuel efficiency, higher emissions, and potential damage to the emissions system.

5. How do I diagnose a P119E code on a 2018 Chevrolet Silverado?

Diagnosis includes checking the NOx sensor 2 for proper operation, inspecting the wiring and connectors for damage or corrosion, and using a scan tool to monitor voltage readings from the sensor.

6. How can I fix the P119E code on my 2018 Chevrolet Silverado?

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

7. How much does it cost to fix a P119E code on a 2018 Silverado?

The cost depends on the root cause, but replacing a NOx sensor typically ranges from $300 to $500, including parts and labor.

8. Can a bad NOx sensor cause other problems in my 2018 Chevrolet Silverado?

Yes, a malfunctioning NOx sensor can impact emissions control, reduce fuel efficiency, and potentially cause damage to the catalytic converter over time.

9. How can I prevent a P119E code from occurring again?

Regular maintenance, keeping the emissions system in good condition, and addressing wiring or connector issues promptly can help prevent this code from reoccurring.

10. Do I need to reset the ECM after fixing the P119E code on my 2018 Silverado?

Yes, after repairing the issue, use an OBDII scanner to clear the code and reset the ECM to ensure the system operates correctly.

Discuss the causes and fixes for P119E 2018 Chevrolet Silverado OBDII Code

Submit a New Comment

Code P119E 2018 Chevrolet Silverado comments

No comments found for this page.

AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play