AutoCodes – Generic – P119E

P119E 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 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 1,815

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

What does this mean?

What are the Possible Causes of the DTC P119E?

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?

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 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 code?

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

Need Help with the Code?

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Information for Specific Makes

P119E Buick — NOx Sensor 2 Signal Circuit Low Voltage
P119E Cadillac — NOx Sensor 2 Signal Circuit Low Voltage
P119E Chevrolet — NOx Sensor 2 Signal Circuit Low Voltage
P119E GMC — 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 Code

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

The common symptoms of P119E may include poor engine performance, reduced fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P119E?

Potential causes of P119E include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, issues with the engine control module (ECM), or a problem with the exhaust system.

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

Diagnosing P119E typically involves inspecting the NOx sensor and its wiring for damage, checking the sensor's voltage readings, and using a scan tool to analyze the sensor data and ECM communication.

4. Can I continue driving with OBDII code P119E present?

It is not recommended to continue driving with P119E as it can lead to further damage to the vehicle and may result in failing emissions tests. It is best to address the issue promptly.

5. How can I repair OBDII code P119E (NOx Sensor 2 Signal Circuit Low Voltage)?

Repairing P119E may involve replacing the faulty NOx sensor, repairing damaged wiring or connectors, resetting the ECM, or addressing any exhaust system issues contributing to the fault code.

6. Are there any DIY tips for fixing OBDII code P119E?

While diagnosing and repairing P119E may require advanced tools and technical knowledge, you can start by checking the sensor connections and wiring for any visible damage before seeking professional help.

7. How much does it cost to fix OBDII code P119E?

The cost of fixing P119E can vary depending on the root cause of the issue, the extent of the repairs needed, and the labor rates of the repair shop. It is advisable to obtain quotes from different mechanics.

8. Can a faulty NOx sensor cause other issues in the vehicle?

A faulty NOx sensor can potentially affect the vehicle's emission levels, fuel efficiency, and overall engine performance if left unresolved. It is essential to address the issue promptly.

9. Is it possible to prevent OBDII code P119E from occurring?

Regular maintenance, timely repairs of any sensor-related issues, and using quality fuel can help prevent the occurrence of P119E and other related fault codes in the vehicle.

10. Will resetting the check engine light make OBDII code P119E disappear?

Resetting the check engine light may temporarily turn off the warning indicator, but if the underlying issue causing P119E is not addressed, the fault code is likely to reappear during subsequent driving cycles.