AutoCodes – Chevrolet – P1193 2018 Chevrolet Silverado

P1193 2018 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 2018 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 237

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 2018 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 2018 Chevrolet Silverado - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P1193 2018 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 2018 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 2018 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 2018 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P1193 2018 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 2018 Chevrolet Silverado Code

What does the OBDII code P1193 mean on a 2018 Chevrolet Silverado?

1. P1193 indicates an issue with the O2 Low Reference Circuit Low Voltage, specifically related to NOx Sensor 1. 2.

What are the common symptoms of the P1193 code on a 2018 Silverado?

Symptoms may include the check engine light turning on, reduced fuel efficiency, poor engine performance, and increased emissions. 3.

What causes the P1193 code in a 2018 Chevrolet Silverado?

Possible causes include a damaged NOx sensor, wiring issues like short circuits or loose connections, or a problem with the vehicleâ€™s ECM. 4.

Can a dirty NOx sensor trigger the P1193 code?

Yes, a dirty or contaminated NOx sensor can affect its performance and lead to the P1193 code. 5.

How can I diagnose the P1193 code on my 2018 Chevrolet Silverado?

Start by inspecting the NOx sensor and its wiring for damage or corrosion. Use an OBDII scanner to confirm the code and monitor sensor voltage readings. 6.

Is it safe to drive a 2018 Silverado with the P1193 code?

While the vehicle may still run, driving with this code can reduce performance, harm fuel economy, and potentially damage the catalytic converter over time. 7.

How do I fix the P1193 code in my Chevrolet Silverado?

Repairs may include replacing the NOx sensor, repairing damaged wiring, or reprogramming the ECM if necessary. 8.

How much does it cost to repair the P1193 code on a 2018 Silverado?

The cost varies, but replacing a NOx sensor typically ranges from $300 to $700, including parts and labor. 9.

Can a software update resolve the P1193 code issue?

In some cases, a software update for the ECM might resolve the issue, but this depends on the specific circumstances and should be diagnosed by a professional. 10.

What tools do I need to troubleshoot the P1193 code?

Youâ€™ll need an OBDII scanner, a multimeter to check circuit voltage, and possibly a repair manual for wiring diagrams specific to the 2018 Silverado.