AutoCodes – Chevrolet – P119B 2014 Chevrolet Silverado

P119B 2014 Chevrolet Silverado Code - NOx Sensor 1 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, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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: P119B 2014 Chevrolet Silverado indicates NOx Sensor 1 Signal Circuit Low Voltage.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides Sensor 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 227

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
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Code P119B 2014 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 P119B 2014 Chevrolet Silverado - NOx Sensor 1 Signal Circuit Low Voltage - AutoCodes.com — P119B 2014 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P119B 2014 Chevrolet Silverado?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P119B 2014 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 P119B 2014 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 P119B 2014 Chevrolet Silverado code?

Need more information on how to fix the P119B 2014 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P119B 2014 Chevrolet Silverado Code

What does OBDII code P119B mean for a 2014 Chevrolet Silverado?

Code P119B indicates a low voltage issue in the signal circuit of NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.

What are the common symptoms of code P119B in a 2014 Chevrolet Silverado?

Symptoms may include reduced engine performance, poor fuel economy, illuminated check engine light, and possible emissions test failure.

What causes the P119B code to appear on a 2014 Chevrolet Silverado?

The code is typically caused by a faulty NOx sensor, damaged wiring or connectors, or issues with the sensorâ€™s signal circuit.

Can I continue driving with code P119B on my 2014 Chevrolet Silverado?

While the truck may still be drivable, ignoring the code can lead to increased emissions and potential damage to the exhaust system over time.

How do I diagnose the P119B code on a 2014 Chevrolet Silverado?

Check the wiring and connectors for damage, test the NOx sensor for proper operation, and ensure the signal voltage is within the manufacturerâ€™s specifications.

What repairs can fix code P119B in a 2014 Chevrolet Silverado?

Repairs may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, or addressing any signal circuit issues.

How much does it cost to replace a NOx sensor for a 2014 Chevrolet Silverado?

The cost for a new NOx sensor can range from $300 to $500, plus labor charges, depending on the sensor and location.

Can a software update resolve the P119B code?

In some cases, a software update to the vehicleâ€™s ECM may be required, but this is less common compared to hardware-related repairs.

Do I need specialized tools to fix code P119B in a 2014 Chevrolet Silverado?

Yes, an OBDII scanner and multimeter are typically needed to diagnose and fix issues related to the NOx sensor circuit.

What happens if the P119B code is left unresolved?

If ignored, the vehicle may produce excessive emissions, and prolonged issues could damage the catalytic converter or other exhaust system components.