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P1193 2014 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 2014 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 261
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 2014 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 2014 Chevrolet Silverado - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com
P1193 2014 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 2014 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 2014 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 2014 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 2014 Chevrolet Silverado code?

Need more information on how to fix the P1193 2014 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 2014 Chevrolet Silverado Code

1. What does the OBDII code P1193 mean on a 2014 Chevrolet Silverado?

P1193 indicates an issue with the O2 Low Reference Circuit Low Voltage for NOx Sensor 1, meaning the sensor is detecting abnormal voltage levels in the circuit.

2. What are the common symptoms of a P1193 code in a 2014 Chevrolet Silverado?

Symptoms may include a check engine light, reduced fuel efficiency, rough idling, poor engine performance, and possibly entering limp mode.

3. What causes the P1193 code on a 2014 Chevrolet Silverado?

Possible causes include a faulty NOx sensor, damaged wiring or connectors, corrosion in the circuit, or a malfunctioning engine control module (ECM).

4. Can I drive my 2014 Chevrolet Silverado with a P1193 code?

Driving with this code is not recommended as it can lead to increased emissions, reduced fuel economy, and potential damage to other engine components.

5. How do I diagnose the P1193 code on my 2014 Chevrolet Silverado?

Start by checking the NOx sensor wiring and connectors for damage or corrosion, measure the circuit voltage, and use a scan tool to monitor the sensor's readings.

6. How do I fix a P1193 code on a 2014 Chevrolet Silverado?

Repairs may involve replacing the NOx sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming the ECM if needed.

7. How much does it cost to fix a P1193 code on a 2014 Chevrolet Silverado?

The repair cost depends on the issue, but replacing a NOx sensor typically costs $200–$600, while wiring repairs may cost less.

8. Can a bad NOx sensor cause a P1193 code on my 2014 Chevrolet Silverado?

Yes, a faulty NOx sensor is one of the primary causes of this code and should be inspected during diagnosis.

9. What tools are needed to fix the P1193 code on a 2014 Chevrolet Silverado?

You may need a multimeter, a scan tool capable of reading live data, and basic hand tools for sensor or wiring repairs.

10. Does the P1193 code affect emissions testing for a 2014 Chevrolet Silverado?

Yes, this code can cause increased emissions and may lead to a failed emissions test until the issue is resolved.

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