AutoCodes – Chevrolet – P119C 2017 Chevrolet Silverado

P119C 2017 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 2017 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 190

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P119C 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 P119C 2017 Chevrolet Silverado - NOx Sensor 1 Signal Circuit High Voltage - AutoCodes.com — P119C 2017 Chevrolet Silverado Code - NOx Sensor 1 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119C 2017 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 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 P119C 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 P119C 2017 Chevrolet Silverado code?

Need more information on how to fix the P119C 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P119C 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area

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 2017 Chevrolet Silverado Code

1. What does the OBDII code P119C mean on a 2017 Chevrolet Silverado?

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

2. What are common symptoms of the P119C code?

Symptoms may include a Check Engine Light, reduced fuel efficiency, decreased engine performance, or the vehicle entering limp mode.

3. What causes the P119C code to appear on a 2017 Chevrolet Silverado?

Common causes include a faulty NOx Sensor 1, damaged wiring or connectors in the sensor circuit, or issues with the Engine Control Module (ECM).

4. How do I diagnose the P119C code?

Start by using an OBDII scanner to confirm the code, inspect the NOx sensor and its wiring for damage, and check for proper voltage signals in the circuit.

5. Can a bad NOx sensor trigger the P119C code?

Yes, a malfunctioning NOx Sensor 1 is one of the primary reasons for this code, as it may fail to send accurate signals to the ECM.

6. Can I drive my 2017 Chevrolet Silverado with the P119C code active?

Itâ€™s not recommended, as the issue can lead to reduced engine performance, higher emissions, and potential long-term damage.

7. What tools are needed to fix a P119C code?

You may need an OBDII scanner, a multimeter for checking voltage, and basic hand tools to replace or repair the NOx sensor or its wiring.

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

Replacing a NOx sensor typically costs between $300 and $700, depending on labor rates and parts pricing.

9. Can the P119C code be caused by software issues in the ECM?

Yes, a software glitch or outdated ECM programming can sometimes cause the code, though this is less common than physical sensor or wiring issues.

10. How can I prevent the P119C code from reoccurring?

Regularly inspect and maintain the exhaust system, ensure wiring and connectors are in good condition, and promptly address any Check Engine Light warnings.