AutoCodes – GMC – P1193 2016 GMC Sierra

P1193 2016 GMC Sierra Code - O2 Low Reference Circuit Low Voltage (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: P1193 2016 GMC Sierra indicates O2 Low Reference Circuit Low Voltage (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 190

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 P1193 2016 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 P1193 2016 GMC Sierra - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P1193 2016 GMC Sierra Code - O2 Low Reference Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P1193 2016 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 P1193 2016 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 P1193 2016 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 P1193 2016 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 P1193 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P1193 on a 2016 GMC Sierra?

- Common symptoms include poor engine performance, reduced fuel efficiency, and the illumination of the Check Engine light.

2. What does the OBDII code P1193 "O2 Low Reference Circuit Low Voltage (NOx Sensor 1)" indicate for a 2016 GMC Sierra?

- This code indicates a low voltage condition in the oxygen sensor's reference circuit, specifically related to NOx sensor 1.

3. What are the possible causes of OBDII code P1193 on a 2016 GMC Sierra?

- Potential causes include a faulty NOx sensor, damaged wiring or connectors in the sensor circuit, or issues with the vehicle's powertrain control module.

4. How can I diagnose the O2 Low Reference Circuit Low Voltage issue on my 2016 GMC Sierra?

- Diagnose by checking the NOx sensor's wiring for damage, inspecting the connectors for corrosion, and testing the sensor's voltage output using a multimeter.

5. Can driving with OBDII code P1193 on a 2016 GMC Sierra cause further damage?

- Continuing to drive with this code may lead to increased emissions, reduced engine performance, and potential damage to the catalytic converter over time.

6. How can I repair OBDII code P1193 on a 2016 GMC Sierra?

- Repair options include replacing the faulty NOx sensor, repairing damaged wiring or connectors, or resetting the code using a diagnostic scanner after addressing the issue.

7. Are there any DIY tips for addressing O2 Low Reference Circuit Low Voltage on a 2016 GMC Sierra?

- DIY tips include checking for loose connections, ensuring proper sensor installation, and consulting the vehicle's service manual for specific troubleshooting steps.

8. Is it safe to continue driving my 2016 GMC Sierra with the Check Engine light illuminated due to code P1193?

- While the vehicle may still be operable, it is recommended to address the underlying issue promptly to prevent potential long-term damage and ensure optimal engine performance.

9. Can a mechanic reset the OBDII code P1193 on a 2016 GMC Sierra without performing any repairs?

- While a mechanic can reset the code temporarily, it is crucial to diagnose and address the root cause to prevent the code from reappearing and causing further issues.

10. How much does it typically cost to repair OBDII code P1193 "O2 Low Reference Circuit Low Voltage (NOx Sensor 1)" on a 2016 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may involve sensor replacement, wiring repairs, or module reprogramming, with total costs ranging from $200 to $500 or more.