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P1193 2015 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 2015 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 171
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P1193 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 P1193 2015 GMC Sierra - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com
P1193 2015 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 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 P1193 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 P1193 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 P1193 2015 GMC Sierra code?

Need more information on how to fix the P1193 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 2015 GMC Sierra Code

1. What does the OBDII code P1193 mean on a 2015 GMC Sierra?

P1193 indicates an issue with the O2 low reference circuit, specifically low voltage detected in the NOx Sensor 1.

2. What are common symptoms of a P1193 code in a 2015 GMC Sierra?

Symptoms may include reduced fuel efficiency, illuminated check engine light, poor engine performance, or increased emissions.

3. What causes the P1193 code in a GMC Sierra?

Common causes include a faulty NOx sensor, damaged wiring or connectors in the low reference circuit, or a failing engine control module (ECM).

4. Can a dirty or clogged NOx sensor trigger the P1193 code?

Yes, a dirty or malfunctioning NOx sensor can cause incorrect readings, leading to this code being set.

5. How do I diagnose the P1193 code in my 2015 GMC Sierra?

Start by inspecting the wiring and connectors for damage, check the NOx sensor for proper operation, and test the voltage in the low reference circuit.

6. Can I drive with a P1193 code on my 2015 GMC Sierra?

It’s not recommended to drive for an extended period with this code, as it may lead to reduced performance and potential damage to the emission system.

7. How is the P1193 code typically fixed?

Repairs often involve replacing the faulty NOx sensor, repairing damaged wiring, or reprogramming the ECM if necessary.

8. How much does it cost to fix the P1193 code on a GMC Sierra?

Costs vary, but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor. Wiring repairs may cost less.

9. Can a weak battery cause the P1193 code to appear?

A weak battery is unlikely to cause this specific code, but voltage issues in the circuit could contribute to the problem.

10. Is the P1193 code covered under warranty for a 2015 GMC Sierra?

It may be covered under the emissions warranty, depending on the vehicle's age and mileage. Consult your warranty documentation for details.

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