AutoCodes – Chevrolet – P119C 2016 Chevrolet Silverado

P119C 2016 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 2016 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 650

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 P119C 2016 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 2016 Chevrolet Silverado - NOx Sensor 1 Signal Circuit High Voltage - AutoCodes.com — P119C 2016 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119C 2016 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 2016 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 2016 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 2016 Chevrolet Silverado code?

Need more information on how to fix the P119C 2016 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 P119C 2016 Chevrolet Silverado Code

1. What does the OBDII code P119C mean on a 2016 Chevrolet Silverado?

P119C indicates a problem with the NOx Sensor 1 signal circuit, specifically that itâ€™s detecting high voltage, which may affect emissions system performance.

2. What are the common symptoms of a P119C code?

Symptoms can include the check engine light turning on, decreased fuel efficiency, reduced engine performance, and potential difficulty passing emissions tests.

3. What causes the P119C code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the NOx sensor circuit, or a malfunction in the engine control module (ECM).

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

While not a direct cause, issues like excessive soot buildup can impact the NOx sensor's readings and contribute to the code being triggered.

5. How is the P119C code diagnosed?

Technicians will typically use a diagnostic scanner to confirm the code, inspect the NOx sensor circuit for damage, and test the sensorâ€™s voltage output to identify abnormalities.

6. Can I drive my 2016 Chevrolet Silverado with a P119C code?

While the truck may still run, driving with this code can lead to increased emissions and potential long-term damage to the emissions system. Itâ€™s best to address the issue promptly.

7. How do you fix a P119C code on a 2016 Chevrolet Silverado?

Repairs may involve replacing the faulty NOx sensor, repairing damaged wiring or connectors, or reprogramming/updating the ECM if needed.

8. How much does it cost to fix the P119C code?

The cost can vary, but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor. Wiring repairs or ECM updates may add to the cost.

9. Can a software update fix the P119C code?

In some cases, a software update for the engine control module (ECM) may resolve the issue if the problem is related to incorrect sensor calibration or programming.

10. How can I prevent the P119C code from occurring again?

Regular maintenance, using high-quality fuel, and ensuring the exhaust system stays clean can help prevent NOx sensor issues and the P119C code from reappearing.