Engine-Codes.com
Engine-Codes – GMC – P119D GMC

P119D GMC Code - NOx Sensor 2 Signal Circuit

Quick Answer

The P119D GMC diagnostic trouble code indicates a problem with the NOx (Nitrogen Oxide) Sensor 2 Signal Circuit in the vehicle. Common causes include Faulty NOx Sensor 2: The sensor itself may be malfunctioning, sending incorrect signals to the ECM, Wiring Issues: Damage or corrosion in the wiring connecting the NOx Sensor 2 to the ECM can cause signal problems, Exhaust System Leaks: Any leaks in the exhaust system can affect the accuracy of the NOx sensor readings. 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
P119D GMC indicates NOx Sensor 2 Signal Circuit.
Common causes
Common causes include Faulty NOx Sensor 2: The sensor itself may be malfunctioning, sending incorrect signals to the ECM, Wiring Issues: Damage or corrosion in the wiring connecting the NOx Sensor 2 to the ECM can cause signal problems, Exhaust System Leaks: Any leaks in the exhaust system can affect the accuracy of the NOx sensor readings.
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 08, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P119D GMC Description

The P119D GMC diagnostic trouble code indicates a problem with the NOx (Nitrogen Oxide) Sensor 2 Signal Circuit in the vehicle. The NOx sensor is responsible for monitoring the levels of nitrogen oxide in the exhaust gases to ensure compliance with emissions standards. This specific code relates to the second NOx sensor in the system, which is typically located downstream from the catalytic converter.

OBDII Code P119D GMC - NOx Sensor 2 Signal Circuit
P119D GMC Code - NOx Sensor 2 Signal Circuit

Common Causes of P119D GMC

  1. Faulty NOx Sensor 2: The sensor itself may be malfunctioning, sending incorrect signals to the ECM.
  2. Wiring Issues: Damage or corrosion in the wiring connecting the NOx Sensor 2 to the ECM can cause signal problems.
  3. Exhaust System Leaks: Any leaks in the exhaust system can affect the accuracy of the NOx sensor readings.
  4. ECM Malfunction: A fault in the engine control module may prevent it from properly interpreting the NOx Sensor 2 signals.

Symptoms of P119D GMC

  1. Check Engine Light: The most common symptom associated with the P119D code is the illumination of the Check Engine Light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A faulty NOx Sensor 2 signal can lead to poor fuel combustion, resulting in decreased fuel efficiency.
  3. Failed Emissions Test: If the NOx levels are not being accurately monitored, the vehicle may fail emissions tests due to excessive nitrogen oxide emissions.
  4. Rough Idle: A malfunctioning NOx Sensor 2 can cause the engine to run rough or have irregular idle speeds.

How to Fix P119D GMC

  1. Diagnostic Testing: The first step is to perform a diagnostic scan to confirm the P119D code and pinpoint the exact cause of the issue.
  2. Inspect Wiring: Check the wiring harness for any damage or corrosion and repair or replace as needed.
  3. Test NOx Sensor 2: Test the NOx Sensor 2 using a multimeter to verify its functionality. Replace if necessary.
  4. Clear Codes: Once the issue has been resolved, clear the trouble codes from the ECM to reset the Check Engine Light.
  5. Emissions Test: After repairs have been made, it's advisable to conduct an emissions test to ensure the vehicle is compliant.

Cost to Fix P119D GMC

The cost of repairing a NOx Sensor 2 Signal Circuit issue can vary depending on the specific cause of the problem and the vehicle's make and model. On average, the parts for a NOx sensor replacement can range from $200 to $500, while labor costs can add an additional $100 to $200. Overall, the total repair cost for addressing a P119D GMC code may fall between $300 and $700. However, it's essential to note that prices can vary significantly based on location, the complexity of the repair, and the specific rates of the auto repair shop. It's recommended to obtain quotes from multiple mechanics to get a more accurate estimate for the repair.

Need more information about the P119D GMC code?

Need more information on how to fix the P119D GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P119D GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

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 P119D GMC Code

1. What does the OBDII code P119D mean on a GMC vehicle?

P119D indicates an issue with the NOx Sensor 2 Signal Circuit, typically related to a malfunction in the second nitrogen oxide (NOx) sensor or its wiring.

2. What are the common symptoms of code P119D on a GMC?

Symptoms may include an illuminated check engine light, reduced engine performance, poor fuel efficiency, or difficulty passing emissions tests.

3. What causes the P119D code to appear?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, excessive soot buildup on the sensor, or an issue with the engine control module (ECM).

4. Can a dirty NOx sensor trigger the P119D code?

Yes, excessive soot or contamination on the NOx sensor can impair its readings and trigger the P119D code.

5. How do you diagnose a P119D code?

Diagnosis involves using a scan tool to read live data from the NOx sensor, inspecting the wiring and connectors for damage, and testing the sensor’s resistance and functionality.

6. Can a faulty exhaust system cause the P119D code?

Yes, issues with the exhaust system, such as leaks or excessive soot buildup, can affect the NOx sensor’s performance and trigger the code.

7. Is it safe to drive with a P119D code active?

While the vehicle may still be drivable, ignoring the code can result in reduced performance, increased emissions, and potential damage to the catalytic converter.

8. What is the typical repair for a P119D code?

Repairs may include replacing the faulty NOx sensor, cleaning soot buildup, repairing damaged wiring, or reprogramming the ECM if necessary.

9. How much does it cost to fix a P119D code on a GMC?

Repair costs can vary but typically range from $200 to $600, depending on whether the NOx sensor needs replacement and labor charges.

10. Can clearing the code fix the P119D issue?

Clearing the code without addressing the root cause may temporarily turn off the check engine light, but the issue will likely return until proper repairs are made.

Discuss the causes and fixes for P119D GMC OBDII Code

Submit a New Comment

Code P119D GMC comments

No comments found for this page.