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P1193 2015 Chevrolet Silverado 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 Chevrolet Silverado 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 307
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Mar 24, 2024
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Code P1193 2015 Chevrolet Silverado 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 Chevrolet Silverado - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com
P1193 2015 Chevrolet Silverado Code - O2 Low Reference Circuit Low Voltage (NOx Sensor 1)
What does this mean?

What are the Possible Causes of the DTC P1193 2015 Chevrolet Silverado?

  • 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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado code?

Need more information on how to fix the P1193 2015 Chevrolet Silverado 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 Chevrolet Silverado Code

1. What does the OBDII code P1193 mean on a 2015 Chevrolet Silverado?

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

2. What are the common symptoms of the P1193 code?

Symptoms may include an illuminated Check Engine Light, reduced fuel efficiency, poor engine performance, and possibly increased emissions.

3. What causes the P1193 code in a 2015 Chevrolet Silverado?

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

4. Can a dirty NOx sensor cause the P1193 code?

Yes, contamination or buildup on the NOx sensor can lead to inaccurate readings, potentially triggering the P1193 code.

5. How can I diagnose the P1193 code?

Start by inspecting the wiring and connectors for damage or corrosion. Use a scan tool to monitor sensor voltage and compare it to manufacturer specifications.

6. How do I fix the P1193 code on my Silverado?

Repairs may involve replacing the NOx sensor, repairing damaged wiring or connectors, or reprogramming/updating the ECM if necessary.

7. Is it safe to drive with the P1193 code?

Driving with this code may lead to decreased performance and higher emissions. Prolonged driving without repair could harm the catalytic converter or other engine components.

8. How much does it cost to fix the P1193 code?

Repair costs vary depending on the issue. Replacing the NOx sensor can cost $200–$500, while wiring repairs may be less expensive.

9. Can a bad ECM cause the P1193 code?

While rare, a malfunctioning ECM could incorrectly interpret sensor signals or fail to communicate with the NOx sensor, causing the code.

10. How do I prevent the P1193 code from reoccurring?

Regular maintenance, including checking and cleaning the NOx sensor and inspecting wiring for damage, can help prevent this code from reappearing.

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