AutoCodes – GMC – P1192 2015 GMC Sierra

P1192 2015 GMC Sierra 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 2015 GMC Sierra 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 188

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1192 2015 GMC Sierra 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 2015 GMC Sierra - O2 Low Reference Circuit (NOx Sensor 1) - AutoCodes.com — P1192 2015 GMC Sierra Code - O2 Low Reference Circuit (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P1192 2015 GMC Sierra?

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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra code?

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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 P1192 2015 GMC Sierra Code

What does OBDII code P1192 mean on a 2015 GMC Sierra?

Code P1192 indicates an issue with the O2 low reference circuit for NOx Sensor 1, typically involving a fault in the sensor or its wiring.

What are the common symptoms of code P1192 in a 2015 GMC Sierra?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, or a failed emissions test.

What causes code P1192 on a 2015 GMC Sierra?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the O2 low reference circuit, or issues with the sensorâ€™s power supply.

Can I drive my 2015 GMC Sierra with code P1192?

Driving with code P1192 is not recommended, as it can lead to poor engine performance, increased emissions, and potential damage to other components.

How do I diagnose code P1192 on a 2015 GMC Sierra?

Start by inspecting the NOx sensor, its wiring, and connectors for damage. Use a multimeter to check for proper voltage and continuity in the circuit.

How do you fix code P1192 in a 2015 GMC Sierra?

Repairs may involve replacing the NOx sensor, repairing damaged wiring, or cleaning and reconnecting corroded connectors.

How much does it cost to fix code P1192 on a 2015 GMC Sierra?

The cost can vary but typically ranges from $200 to $600, depending on whether the NOx sensor needs replacement or if wiring repairs are required.

Can a faulty NOx sensor cause other problems in a 2015 GMC Sierra?

Yes, a faulty NOx sensor can lead to increased emissions, reduced fuel efficiency, and potentially damage the catalytic converter over time.

What tools are needed to diagnose and repair code P1192 on a 2015 GMC Sierra?

Youâ€™ll need an OBDII scanner, multimeter, and basic tools for inspecting and repairing wiring or replacing the NOx sensor.

Is code P1192 covered under warranty for a 2015 GMC Sierra?

It depends on your vehicle's warranty coverage, but emissions-related components like the NOx sensor are often covered under extended emissions warranties.