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P119F 2017 Chevrolet Silverado Code - NOx Sensor 2 Signal Circuit High Voltage

Quick Answer

The P119F code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the NOx (Nitrogen Oxide) sensor 2, which is typically located in the exhaust system of the vehicle. Common causes include Faulty NOx Sensor: The sensor itself may be defective or malfunctioning due to age or exposure to harsh conditions, Wiring Issues: Damaged or corroded wiring and connectors can lead to high voltage readings, Exhaust Leaks: Leaks in the exhaust system can affect the sensor's readings and performance. 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
P119F 2017 Chevrolet Silverado indicates NOx Sensor 2 Signal Circuit High Voltage.
Common causes
Common causes include Faulty NOx Sensor: The sensor itself may be defective or malfunctioning due to age or exposure to harsh conditions, Wiring Issues: Damaged or corroded wiring and connectors can lead to high voltage readings, Exhaust Leaks: Leaks in the exhaust system can affect the sensor's readings and performance.
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.
What is this?
Table of contents Created and updated by William Orellana on Oct 17, 2024
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Code P119F 2017 Chevrolet Silverado Description

The P119F code indicates that the Engine Control Module (ECM) has detected a high voltage signal from the NOx (Nitrogen Oxide) sensor 2, which is typically located in the exhaust system of the vehicle. The NOx sensor plays a critical role in monitoring the levels of nitrogen oxides produced during combustion, which is essential for meeting emissions standards. When the ECM receives a signal that is higher than the expected range, it triggers this diagnostic trouble code (DTC).

OBDII Code P119F 2017 Chevrolet Silverado - NOx Sensor 2 Signal Circuit High Voltage
P119F 2017 Chevrolet Silverado Code - NOx Sensor 2 Signal Circuit High Voltage

Common Causes of P119F 2017 Chevrolet Silverado

  1. Faulty NOx Sensor: The sensor itself may be defective or malfunctioning due to age or exposure to harsh conditions.
  2. Wiring Issues: Damaged or corroded wiring and connectors can lead to high voltage readings.
  3. Exhaust Leaks: Leaks in the exhaust system can affect the sensor's readings and performance.
  4. ECM Malfunction: A failure in the engine control module could misinterpret sensor data, triggering the code.
  5. Contaminants: Build-up of soot or other contaminants on the sensor can impede its function and lead to erroneous readings.

Symptoms of P119F 2017 Chevrolet Silverado

  1. Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  2. Poor Fuel Economy: Drivers may notice a decrease in fuel efficiency due to improper air-fuel mixture adjustments.
  3. Increased Emissions: The vehicle may produce higher levels of nitrogen oxides, potentially leading to failing an emissions test.
  4. Engine Performance Issues: Symptoms such as rough idling, hesitation during acceleration, or a decrease in overall power may occur.
  5. Limp Mode Activation: The vehicle may enter a reduced power mode to protect the engine, limiting speed and performance.

How to Fix P119F 2017 Chevrolet Silverado

  1. Diagnostic Scan: Begin by using an OBD-II scanner to confirm the P119F code and check for any related codes that may provide additional context.
  2. Visual Inspection: Inspect the NOx sensor and its wiring for any visible damage, corrosion, or loose connections.
  3. Sensor Replacement: If the sensor is found to be faulty, replace it with a new one, ensuring all connections are secure and free of contaminants.
  4. Repair Wiring: If wiring issues are detected, repair or replace damaged wires and connectors to ensure proper signal transmission.
  5. Clear Codes and Test Drive: After repairs, clear the diagnostic codes and perform a test drive to ensure the issue is resolved and the check engine light does not reappear.

Cost to Fix P119F 2017 Chevrolet Silverado

The typical cost for diagnosing and repairing a P119F code can range from $200 to $600, depending on the specific repairs needed. This estimate includes parts and labor, with the NOx sensor itself costing between $100 and $300. Labor costs can vary significantly based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates may be higher in metropolitan areas or at dealerships, while independent shops often charge less. It is advisable to check local rates for a more precise estimate and to obtain multiple quotes to ensure a fair price for the necessary repairs.

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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 P119F 2017 Chevrolet Silverado Code

1. What does the OBDII code P119F mean on a 2017 Chevrolet Silverado?

Code P119F indicates a high voltage issue in the signal circuit of NOx Sensor 2, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of code P119F in a 2017 Chevrolet Silverado?

Common symptoms include the check engine light being illuminated, reduced fuel efficiency, poor engine performance, and possibly a derate mode in severe cases.

3. What causes the P119F code to appear?

The code can be triggered by a faulty NOx Sensor 2, damaged wiring or connectors, excessive nitrogen oxide emissions, or an issue with the engine control module (ECM).

4. Can I drive my 2017 Chevrolet Silverado with the P119F code?

It is possible to drive with this code, but it’s not recommended as it may lead to reduced performance, higher emissions, and potential damage to the emissions system.

5. How do I diagnose the P119F code on my Silverado?

Start by inspecting the wiring and connectors for NOx Sensor 2, then use a scan tool to monitor sensor data. If necessary, test the sensor for proper voltage and resistance.

6. How do I fix the P119F code on a 2017 Chevrolet Silverado?

Common fixes include repairing or replacing damaged wiring, cleaning or replacing the NOx Sensor 2, and updating or reprogramming the ECM if required.

7. How much does it cost to repair the P119F code?

Repair costs can range from $200 to $700 depending on whether the issue involves wiring repairs, sensor replacement, or ECM updates.

8. Where is NOx Sensor 2 located on a 2017 Chevrolet Silverado?

NOx Sensor 2 is typically located downstream in the exhaust system, after the catalytic converter.

9. How can I prevent the P119F code from recurring?

Regular maintenance, including inspecting the exhaust system and sensors, and using high-quality fuel can help prevent this code from reappearing.

10. Will a faulty NOx Sensor 2 affect emissions testing?

Yes, a malfunctioning NOx Sensor 2 may cause your vehicle to fail emissions testing due to inaccurate monitoring of nitrogen oxide levels.

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