AutoCodes – Chevrolet – P119E 2017 Chevrolet Silverado

P119E 2017 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 2017 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.

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Code Popularity 246

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 2017 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 2017 Chevrolet Silverado - NOx Sensor 2 Signal Circuit Low Voltage - AutoCodes.com — P119E 2017 Chevrolet Silverado Code - NOx Sensor 2 Signal Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P119E 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P119E 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

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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 P119E 2017 Chevrolet Silverado Code

What does the OBDII code P119E mean on a 2017 Chevrolet Silverado?

P119E indicates a low voltage issue in the signal circuit of NOx Sensor 2, which monitors nitrogen oxide emissions to ensure proper exhaust system function.

What are the common symptoms of P119E in a 2017 Chevrolet Silverado?

Symptoms may include the check engine light turning on, reduced engine performance, increased emissions, or poor fuel economy.

What causes the P119E code to appear?

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

Can a bad NOx Sensor 2 cause drivability issues?

Yes, a failing NOx Sensor 2 can lead to reduced engine performance, poor acceleration, or even limp mode in some cases.

How do I diagnose the P119E code on my Silverado?

Diagnosis involves inspecting the NOx Sensor 2 wiring and connectors for damage, testing the sensor for proper operation, and checking for ECM-related issues.

Is it safe to drive with the P119E code active?

Driving with this code is not recommended, as it may lead to increased emissions, reduced fuel efficiency, or further damage to the emissions system.

How much does it cost to repair the P119E code?

Repair costs vary but typically range from $300 to $800, depending on whether the NOx Sensor 2 or related wiring needs replacement.

Can the P119E code reset itself?

The code may clear temporarily if the issue is intermittent, but the underlying problem will likely cause it to reappear.

How can I prevent the P119E code from occurring again?

Regular maintenance, including checking wiring and ensuring the exhaust system is in good condition, can help prevent this code from recurring.

Do I need to replace the NOx Sensor 2 to fix the P119E code?

In most cases, replacing NOx Sensor 2 resolves the issue, but always perform a thorough diagnosis to rule out wiring or ECM problems before replacing parts.