AutoCodes – GMC – P1192 GMC

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

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: P1192 GMC indicates O2 Low Reference Circuit (NOx Sensor 1).
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 925

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P1192 GMC 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 P1192 GMC - O2 Low Reference Circuit (NOx Sensor 1) - AutoCodes.com — P1192 GMC Code - O2 Low Reference Circuit (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P1192 GMC?

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 P1192 GMC?

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 P1192 GMC 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 P1192 GMC code?

Need more information on how to fix the P1192 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P1192 2014 GMC Sierra — O2 Low Reference Circuit (NOx Sensor 1)
P1192 2015 GMC Sierra — O2 Low Reference Circuit (NOx Sensor 1)
P1192 2016 GMC Sierra — O2 Low Reference Circuit (NOx Sensor 1)
P1192 2017 GMC Sierra — O2 Low Reference Circuit (NOx Sensor 1)
P1192 2018 GMC Sierra — O2 Low Reference Circuit (NOx Sensor 1)

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.