AutoCodes – Chevrolet – P1193 Chevrolet

P1193 Chevrolet 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 Chevrolet 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 861

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1193 Chevrolet 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 Chevrolet - O2 Low Reference Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P1193 Chevrolet Code - O2 Low Reference Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P1193 Chevrolet?

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 Chevrolet?

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 Chevrolet 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 Chevrolet code?

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

Need Help with the Code?

Get the P1193 Chevrolet code diagnosed by a professional: Find a repair shop in your area

Information for Specific Chevrolet Models

P1193 2014 Chevrolet Silverado — O2 Low Reference Circuit Low Voltage (NOx Sensor 1)
P1193 2015 Chevrolet Silverado — O2 Low Reference Circuit Low Voltage (NOx Sensor 1)
P1193 2016 Chevrolet Silverado — O2 Low Reference Circuit Low Voltage (NOx Sensor 1)
P1193 2017 Chevrolet Silverado — O2 Low Reference Circuit Low Voltage (NOx Sensor 1)
P1193 2018 Chevrolet Silverado — O2 Low Reference Circuit Low Voltage (NOx Sensor 1)

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 Chevrolet Code

1. What are the common symptoms of OBDII code P1193 in a Chevrolet related to the O2 Low Reference Circuit Low Voltage (NOx Sensor 1)?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and potential issues with emissions.

2. What are the possible causes of OBDII code P1193 in a Chevrolet indicating O2 Low Reference Circuit Low Voltage (NOx Sensor 1)?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the O2 sensor circuit, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) issue associated with OBDII code P1193 in a Chevrolet?

- Diagnosis involves using an OBDII scanner to retrieve the specific code, inspecting the NOx sensor and its circuit for any visible damage, and testing the sensor's voltage output.

4. Can driving with an unresolved O2 Low Reference Circuit Low Voltage (NOx Sensor 1) issue, as indicated by OBDII code P1193 in a Chevrolet, cause further damage?

- Continuing to drive with this issue can potentially lead to increased emissions, reduced engine efficiency, and potential damage to other components in the exhaust system.

5. Is it safe to drive my Chevrolet with the OBDII code P1193 related to O2 Low Reference Circuit Low Voltage (NOx Sensor 1) until I can get it repaired?

- While the vehicle may still be operable, it is advisable to address the issue promptly to prevent further damage and ensure optimal engine performance and emissions compliance.

6. How much does it typically cost to repair the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) problem associated with OBDII code P1193 in a Chevrolet?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $500, including parts and labor.

7. Can I attempt to fix the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) issue linked to OBDII code P1193 in my Chevrolet myself?

- DIY repair is possible for those with automotive repair experience and proper tools. However, it is recommended to consult a professional if unsure about the diagnosis or repair process.

8. Will resetting the OBDII system clear the OBDII code P1193 related to the O2 Low Reference Circuit Low Voltage (NOx Sensor 1) in my Chevrolet?

- Resetting the system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear after driving the vehicle for a certain distance.

9. How urgent is it to address the OBDII code P1193 indicating O2 Low Reference Circuit Low Voltage (NOx Sensor 1) in my Chevrolet?

- While the vehicle may still be driveable, it is advisable to address the issue promptly to prevent potential damage to other engine components and ensure proper emissions control.

10. Can a faulty NOx sensor be the sole cause of OBDII code P1193 indicating O2 Low Reference Circuit Low Voltage in a Chevrolet?

- A faulty NOx sensor is a common cause of this code, but it is essential to inspect the entire circuit, including wiring and connectors, to rule out other potential causes.