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Engine-Codes – GMC – P1192 GMC

P1192 GMC Code - O2 Low Reference Circuit (NOx Sensor 1)

Quick Answer

The P1192 GMC code indicates a problem with the O2 low reference circuit for the NOx (Nitrogen Oxide) sensor 1 in the vehicle's exhaust system. Common causes include Faulty Wiring: Damaged or corroded wiring in the O2 low reference circuit can disrupt the voltage supply to the NOx sensor, triggering the P1192 code, Malfunctioning NOx Sensor: A defective NOx sensor itself can cause the low reference circuit to malfunction, leading to the code being triggered, Damaged O2 Sensor: If the O2 sensor in the exhaust system is damaged or not functioning correctly, it can affect the NOx sensor's operation and trigger the code. 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
P1192 GMC indicates O2 Low Reference Circuit (NOx Sensor 1).
Common causes
Common causes include Faulty Wiring: Damaged or corroded wiring in the O2 low reference circuit can disrupt the voltage supply to the NOx sensor, triggering the P1192 code, Malfunctioning NOx Sensor: A defective NOx sensor itself can cause the low reference circuit to malfunction, leading to the code being triggered, Damaged O2 Sensor: If the O2 sensor in the exhaust system is damaged or not functioning correctly, it can affect the NOx sensor's operation and trigger the code.
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 10, 2024
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Code P1192 GMC Description

The P1192 GMC code indicates a problem with the O2 low reference circuit for the NOx (Nitrogen Oxide) sensor 1 in the vehicle's exhaust system. The NOx sensor is responsible for monitoring and measuring the level of nitrogen oxides in the exhaust gases to ensure compliance with emissions regulations. The low reference circuit is an essential part of the sensor's operation, providing a stable electrical voltage for accurate readings.

OBDII Code P1192 GMC - O2 Low Reference Circuit (NOx Sensor 1)
P1192 GMC Code - O2 Low Reference Circuit (NOx Sensor 1)

Common Causes of P1192 GMC

  1. Faulty Wiring: Damaged or corroded wiring in the O2 low reference circuit can disrupt the voltage supply to the NOx sensor, triggering the P1192 code.
  2. Malfunctioning NOx Sensor: A defective NOx sensor itself can cause the low reference circuit to malfunction, leading to the code being triggered.
  3. Damaged O2 Sensor: If the O2 sensor in the exhaust system is damaged or not functioning correctly, it can affect the NOx sensor's operation and trigger the code.
  4. ECM Issues: Problems with the engine control module (ECM), such as software glitches or hardware malfunctions, can also result in the P1192 code.

Symptoms of P1192 GMC

  1. Check Engine Light: The most common symptom associated with the P1192 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning NOx sensor can lead to decreased fuel efficiency as the engine may not be operating at optimal levels.
  3. Failed Emissions Test: If the NOx sensor is not providing accurate readings, the vehicle may fail emissions tests due to high nitrogen oxide emissions.
  4. Rough Idling or Poor Performance: A faulty NOx sensor can also cause rough idling or poor engine performance as the ECM may not be able to adjust fuel levels accurately.

How to Fix P1192 GMC

  1. Diagnose the Issue: Use a scan tool to retrieve the OBD-II code and conduct a thorough inspection of the NOx sensor, wiring, and related components to identify the root cause of the problem.
  2. Replace the NOx Sensor: If the NOx sensor is found to be faulty, replace it with a new, OEM-quality sensor to ensure accurate readings and proper operation.
  3. Repair Wiring: Repair or replace any damaged wiring in the O2 low reference circuit to ensure a stable voltage supply to the NOx sensor.
  4. Reset the Error Code: Clear the error code using the scan tool and perform a test drive to ensure the issue has been resolved and the check engine light does not reappear.
  5. Perform Emissions Test: After the repair, it is advisable to conduct an emissions test to verify that the vehicle meets emissions standards and the NOx sensor is functioning correctly.

Cost to Fix P1192 GMC

The typical repair costs for addressing the P1192 GMC code can vary depending on the specific cause of the issue and the vehicle's make and model. In general, the cost of replacing a NOx sensor can range from $200 to $500, including parts and labor. However, if additional repairs or wiring replacements are needed, the total cost may increase.

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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 P1192 GMC Code

1. What are the common symptoms of OBDII code P1192 GMC?

The common symptoms of OBDII code P1192 GMC include poor engine performance, decreased fuel efficiency, and the illumination of the Check Engine Light.

2. What does the O2 Low Reference Circuit (NOx Sensor 1) error code P1192 GMC indicate?

The P1192 code indicates that there is a low reference voltage in the O2 sensor circuit for NOx Sensor 1 in the vehicle's exhaust system.

3. What are the possible causes of OBDII code P1192 GMC?

Potential causes of code P1192 GMC include a faulty NOx sensor, damaged wiring or connectors in the O2 sensor circuit, or an issue with the engine control module (ECM).

4. How can I diagnose the O2 Low Reference Circuit (NOx Sensor 1) error code P1192 GMC?

Diagnosing code P1192 GMC typically involves using an OBDII scanner to retrieve the code, inspecting the NOx sensor and related wiring, and testing the voltage in the O2 sensor circuit.

5. Can I continue driving my vehicle with OBDII code P1192 GMC?

It is not recommended to continue driving with the P1192 code present, as it can lead to further damage to the vehicle's engine and emission control system. It is best to address the issue promptly.

6. How do I repair OBDII code P1192 GMC?

Repairing code P1192 GMC may involve replacing the faulty NOx sensor, repairing or replacing damaged wiring or connectors, or addressing any issues with the engine control module (ECM).

7. Is it possible to reset the Check Engine Light after fixing OBDII code P1192 GMC?

Yes, after repairing the underlying issue causing the P1192 code, the Check Engine Light can be reset using an OBDII scanner to clear the error code from the vehicle's ECM.

8. Are there any DIY tips for addressing O2 Low Reference Circuit (NOx Sensor 1) error code P1192 GMC?

While some basic diagnostics can be done at home, resolving P1192 GMC may require specialized tools and expertise. It is generally recommended to seek assistance from a qualified mechanic.

9. How much does it typically cost to repair OBDII code P1192 GMC?

The cost of repairing code P1192 GMC can vary depending on the specific issue causing the code, the labor rates in your area, and the cost of any replacement parts needed. It is advisable to obtain quotes from local mechanics for an accurate estimate.

10. Can prolonged exposure to code P1192 GMC cause damage to other vehicle components?

Continued driving with code P1192 GMC may lead to decreased fuel efficiency, increased emissions, and potential damage to the vehicle's catalytic converter or other emission control components. It is important to address the issue promptly to prevent further damage.

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