AutoCodes – Chevrolet – P119C Chevrolet

P119C Chevrolet 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 Chevrolet 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 516

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P119C Chevrolet 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 Chevrolet - NOx Sensor 1 Signal Circuit High Voltage - AutoCodes.com — P119C Chevrolet Code - NOx Sensor 1 Signal Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P119C Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

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Information for Specific Chevrolet Models

P119C 2014 Chevrolet Silverado — NOx Sensor 1 Signal Circuit High Voltage
P119C 2015 Chevrolet Silverado — NOx Sensor 1 Signal Circuit High Voltage
P119C 2016 Chevrolet Silverado — NOx Sensor 1 Signal Circuit High Voltage
P119C 2017 Chevrolet Silverado — NOx Sensor 1 Signal Circuit High Voltage
P119C 2018 Chevrolet Silverado — NOx Sensor 1 Signal Circuit High Voltage

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 Chevrolet Code

1. What are the common symptoms of OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage)?

- Common symptoms include reduced engine performance, rough idling, and increased fuel consumption.

2. What causes the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage) in a Chevrolet?

- The code is often triggered by a faulty NOx sensor, wiring issues, or a problem with the engine control module.

3. How serious is the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage) in a Chevrolet?

- While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the engine or emissions system.

4. Can I drive my Chevrolet with the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage) present?

- It is recommended to avoid driving the vehicle for an extended period with this code present to prevent further damage and ensure proper engine performance.

5. How can I diagnose the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage) in my Chevrolet?

- Diagnosis typically involves using a scan tool to retrieve the code, inspecting the NOx sensor and its wiring, and testing the related components for proper functionality.

6. Is it possible to reset the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage) without repairing the issue?

- While clearing the code may temporarily turn off the check engine light, the underlying problem causing the code will persist until properly repaired.

7. Are there any DIY repair tips for addressing the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage) in a Chevrolet?

- DIY repairs may involve checking and cleaning the sensor connections, inspecting wiring for damage, or replacing the NOx sensor if necessary.

8. How much does it cost to repair the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage) in a Chevrolet?

- Repair costs can vary depending on the cause of the issue, but they may range from $200 to $500 or more, including parts and labor.

9. Can a faulty NOx sensor cause other issues in a Chevrolet besides triggering the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage)?

- Yes, a faulty NOx sensor can impact engine performance, emissions levels, and fuel efficiency, leading to potential drivability issues and increased pollution.

10. How often should the NOx sensor be replaced in a Chevrolet to prevent the recurrence of the OBDII code P119C (NOx Sensor 1 Signal Circuit High Voltage)?

- It is recommended to follow the manufacturer's guidelines for sensor replacement intervals or replace it when symptoms of failure occur to avoid triggering the code again.