AutoCodes – Chevrolet – P119B 2015 Chevrolet Silverado

P119B 2015 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 2015 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 184

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 2015 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 2015 Chevrolet Silverado - NOx Sensor 1 Signal Circuit Low Voltage - AutoCodes.com — P119B 2015 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P119B 2015 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 2015 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 2015 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 2015 Chevrolet Silverado code?

Need more information on how to fix the P119B 2015 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 P119B 2015 Chevrolet Silverado Code

What does the OBDII code P119B mean for a 2015 Chevrolet Silverado?

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 2015 Chevrolet Silverado?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, or the vehicle entering limp mode.

What causes code P119B in a 2015 Chevrolet Silverado?

Common causes include a faulty NOx Sensor 1, wiring issues such as damaged or corroded connections, or a malfunctioning engine control module (ECM).

Can a bad NOx Sensor 1 cause damage to my 2015 Chevrolet Silverado?

If left unaddressed, a faulty NOx sensor can lead to improper emissions control, potential damage to the catalytic converter, and reduced engine performance.

How do I diagnose code P119B in a 2015 Chevrolet Silverado?

Start by using an OBDII scanner to confirm the code, then inspect the NOx sensor wiring and connections for damage, and test the sensor itself for proper function.

How can I fix code P119B in my 2015 Chevrolet Silverado?

Repairs may include replacing the NOx Sensor 1, repairing or replacing damaged wiring, or reprogramming/updating the ECM if necessary.

Can I drive my 2015 Chevrolet Silverado with code P119B?

While the vehicle may still be drivable, itâ€™s not advisable to ignore the issue as it can lead to increased emissions, reduced performance, and potential damage to other components.

What tools are needed to fix code P119B in a 2015 Chevrolet Silverado?

You may need an OBDII scanner, a multimeter for testing electrical connections, and basic hand tools to replace the NOx sensor or repair wiring.

How much does it cost to fix code P119B on a 2015 Chevrolet Silverado?

The cost will vary depending on the specific issue, but replacing the NOx sensor can range from $300 to $600, including parts and labor.

Is it possible to avoid code P119B in a 2015 Chevrolet Silverado?

Regular maintenance, including checking for wiring damage and ensuring the emissions system is in good condition, can help prevent this code from appearing.