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AutoCodes – Chevrolet – P119C 2014 Chevrolet Silverado

P119C 2014 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit High 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
P119C 2014 Chevrolet Silverado indicates NOx Sensor 1 Signal Circuit High 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 298
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P119C 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 P119C 2014 Chevrolet Silverado - NOx Sensor 1 Signal Circuit High Voltage - AutoCodes.com
P119C 2014 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit High Voltage
What does this mean?

What are the Possible Causes of the DTC P119C 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 P119C 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 P119C 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 P119C 2014 Chevrolet Silverado code?

Need more information on how to fix the P119C 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 P119C 2014 Chevrolet Silverado Code

1. What does the OBDII code P119C mean on a 2014 Chevrolet Silverado?

P119C indicates a high voltage issue in the signal circuit of NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of code P119C on a 2014 Chevrolet Silverado?

Common symptoms include a check engine light, reduced fuel efficiency, poor engine performance, and potential activation of limp mode.

3. What causes the P119C code to appear on a 2014 Chevrolet Silverado?

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

4. Can a dirty exhaust system trigger the P119C code?

While a dirty exhaust system itself may not directly trigger the code, excessive soot or deposits can impair NOx sensor function, leading to high voltage readings.

5. How do you diagnose a P119C code on a 2014 Chevrolet Silverado?

Diagnosis involves scanning the vehicle with an OBDII tool, checking the NOx sensor and related wiring for damage, and testing the sensor's voltage output with a multimeter.

6. Is it safe to drive with the P119C code active on my Silverado?

Driving with this code is generally not recommended, as it can lead to reduced engine performance and potential damage to the emissions system over time.

7. How can you fix the P119C code on a 2014 Chevrolet Silverado?

Fixes include replacing the faulty NOx sensor, repairing damaged wiring or connectors, and updating or reprogramming the ECM if necessary.

8. How much does it cost to repair a P119C code on a Silverado?

The cost can range from $200 to $600, depending on whether you need to replace the NOx sensor or perform additional repairs on the wiring or ECM.

9. Can a software update resolve the P119C code on my Silverado?

In some cases, a software update for the ECM can resolve communication or calibration issues related to the NOx sensor.

10. How often do NOx sensors fail on a 2014 Chevrolet Silverado?

NOx sensors typically last 80,000–100,000 miles, but factors like poor fuel quality or excessive exhaust soot can shorten their lifespan.

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