AutoCodes – Chevrolet – P1193 2017 Chevrolet Silverado

P1193 2017 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 2017 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 219

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 2017 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 2017 Chevrolet Silverado - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P1193 2017 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 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?

Need more information on how to fix the P1193 2017 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 2017 Chevrolet Silverado Code

1. What does OBDII code P1193 mean on a 2017 Chevrolet Silverado?

P1193 indicates an issue with the O2 low reference circuit, specifically low voltage detected in NOx Sensor 1, which is part of the emissions system.

2. What are the symptoms of code P1193 in a 2017 Chevrolet Silverado?

Common symptoms include the check engine light turning on, reduced fuel efficiency, poor engine performance, or difficulty passing emissions tests.

3. What causes code P1193 in a 2017 Chevrolet Silverado?

The main causes include a faulty NOx sensor, damaged wiring or connectors in the O2 low reference circuit, or a malfunctioning electronic control module (ECM).

4. Can I drive my Silverado with code P1193 active?

Driving with code P1193 is not recommended as it can lead to increased emissions, reduced performance, and potential damage to the catalytic converter over time.

5. How is code P1193 diagnosed in a 2017 Chevrolet Silverado?

A mechanic will typically use a scan tool to confirm the code, inspect the wiring and connectors for damage, and test the NOx sensor and ECM functionality.

6. How do you fix code P1193 on a 2017 Chevrolet Silverado?

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

7. What is the NOx sensor, and why is it important for code P1193?

The NOx sensor measures nitrogen oxide levels in the exhaust to help the ECM optimize emissions control. A malfunction can disrupt this process and trigger P1193.

8. How much does it cost to fix code P1193 on a Silverado?

Repair costs vary but typically range from $200 to $600 depending on whether the issue is with the NOx sensor, wiring, or ECM.

9. Can a P1193 code be caused by a bad battery or alternator?

While unlikely, electrical issues such as a weak battery or alternator can cause voltage irregularities that might contribute to triggering this code.

10. How can I prevent code P1193 from recurring in my 2017 Silverado?

Regular maintenance, including inspecting the exhaust system, keeping wiring connections secure, and promptly addressing check engine light issues, can help prevent this code.