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P119F 2015 Chevrolet Silverado Code - NOx Sensor 2 Signal Circuit High Voltage

Quick Answer

The P119F diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem with the NOx (nitrogen oxide) sensor 2 signal circuit showing high voltage. Common causes include Faulty NOx Sensor: The NOx sensor itself may be defective and sending incorrect voltage readings to the ECM, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can cause high voltage signals to be sent to the ECM, ECM Malfunction: A problem with the engine control module can also result in erroneous readings from the NOx sensor. 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 2015 Chevrolet Silverado indicates NOx Sensor 2 Signal Circuit High Voltage.
Common causes
Common causes include Faulty NOx Sensor: The NOx sensor itself may be defective and sending incorrect voltage readings to the ECM, Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can cause high voltage signals to be sent to the ECM, ECM Malfunction: A problem with the engine control module can also result in erroneous readings from the NOx sensor.
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 Sep 05, 2024
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Code P119F 2015 Chevrolet Silverado Description

The P119F diagnostic trouble code (DTC) for a 2015 Chevrolet Silverado indicates a problem with the NOx (nitrogen oxide) sensor 2 signal circuit showing high voltage. The NOx sensor is responsible for monitoring the levels of nitrogen oxides in the exhaust gases, and the signal circuit communicates this information to the engine control module (ECM). When the voltage on the signal circuit is too high, it can affect the vehicle's emissions control system and engine performance.

OBDII Code P119F 2015 Chevrolet Silverado - NOx Sensor 2 Signal Circuit High Voltage
P119F 2015 Chevrolet Silverado Code - NOx Sensor 2 Signal Circuit High Voltage

Common Causes of P119F 2015 Chevrolet Silverado

  1. Faulty NOx Sensor: The NOx sensor itself may be defective and sending incorrect voltage readings to the ECM.
  2. Wiring Issues: Corrosion, damage, or poor connections in the wiring harness can cause high voltage signals to be sent to the ECM.
  3. ECM Malfunction: A problem with the engine control module can also result in erroneous readings from the NOx sensor.
  4. Exhaust System Leaks: Leaks in the exhaust system can lead to false readings from the sensor, triggering the high voltage signal.

Symptoms of P119F 2015 Chevrolet Silverado

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning NOx sensor can lead to decreased fuel efficiency as the engine may not be operating optimally.
  3. Poor Performance: The vehicle may experience rough idling, hesitation, or a lack of power due to incorrect sensor readings.
  4. Failed Emissions Test: If the NOx levels are not within acceptable limits, the vehicle may fail an emissions test.

How to Fix P119F 2015 Chevrolet Silverado

  1. Diagnose: Use a scan tool to retrieve the DTC and perform a visual inspection of the NOx sensor and wiring.
  2. Replace NOx Sensor: If the sensor is faulty, replace it with a new one following manufacturer's guidelines.
  3. Check Wiring: Inspect the wiring harness for any damage or corrosion and repair or replace as needed.
  4. Reset ECM: Clear the DTC from the ECM memory and reset the system to see if the issue persists.
  5. Retest: After repairs are made, drive the vehicle to ensure the check engine light does not reappear and monitor for any related symptoms.

Cost to Fix P119F 2015 Chevrolet Silverado

The cost of repairing a NOx sensor 2 signal circuit high voltage issue on a 2015 Chevrolet Silverado can vary depending on the specific cause of the problem. In general, the cost of a new NOx sensor can range from $200 to $500, and labor costs can add an additional $100 to $200. Overall, the total repair cost could be anywhere from $300 to $700. It's important to note that labor rates and parts prices can vary significantly based on location, the repair shop chosen, and the complexity of the repair. It's advisable to obtain quotes from multiple shops to ensure a competitive price.

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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 2015 Chevrolet Silverado Code

1. What does the OBDII code P119F mean on a 2015 Chevrolet Silverado?

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 common symptoms of a P119F code in a 2015 Silverado?

Symptoms may include the check engine light turning on, reduced engine power, poor fuel economy, and the vehicle possibly entering limp mode.

3. What causes the P119F code to appear in a Chevy Silverado?

Common causes include a faulty NOx Sensor 2, damaged wiring or connectors in the sensor circuit, or issues with the engine control module (ECM).

4. Can I drive my 2015 Silverado with a P119F code?

It’s not recommended to drive for extended periods, as the issue may impact emissions performance and cause further engine or exhaust system damage.

5. How is the P119F code diagnosed?

A mechanic will use a scan tool to confirm the code, inspect the NOx sensor’s wiring and connectors, and test the sensor’s voltage and signal output.

6. How do I fix the P119F code on a 2015 Chevrolet Silverado?

Repairs may involve replacing the NOx Sensor 2, repairing or replacing damaged wiring, or reprogramming the ECM if necessary.

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

The cost varies but typically ranges between $300 and $800, depending on whether the NOx sensor, wiring, or ECM needs repair or replacement.

8. Can a dirty exhaust system cause the P119F code?

While a dirty exhaust system isn’t a direct cause, excessive soot or buildup can damage or impair the NOx sensor’s function.

9. Is a P119F code covered under warranty for a 2015 Silverado?

This depends on your warranty terms, but emissions-related components like the NOx sensor may be covered under the federal emissions warranty.

10. How can I prevent the P119F code from occurring again?

Regular maintenance, using high-quality fuel, and promptly addressing exhaust system issues can help prevent future NOx sensor problems.

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