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P1193 2017 GMC Sierra Code - O2 Low Reference Circuit Low Voltage (NOx Sensor 1)

Quick Answer

The P1193 code on a 2017 GMC Sierra indicates a problem with the O2 Low Reference Circuit Low Voltage, specifically related to the NOx Sensor 1. Common causes include Faulty NOx Sensor: The sensor itself may be malfunctioning, leading to inaccurate readings and triggering the P1193 code, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the O2 low reference circuit can disrupt the sensor's operation, ECM Malfunction: Problems with the engine control module (ECM) can affect the sensor's ability to function properly. 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 GMC Sierra indicates O2 Low Reference Circuit Low Voltage (NOx Sensor 1).
Common causes
Common causes include Faulty NOx Sensor: The sensor itself may be malfunctioning, leading to inaccurate readings and triggering the P1193 code, Wiring or Connector Issues: Damaged or corroded wiring or connectors in the O2 low reference circuit can disrupt the sensor's operation, ECM Malfunction: Problems with the engine control module (ECM) can affect the sensor's ability to function properly.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P1193 2017 GMC Sierra Description

The P1193 code on a 2017 GMC Sierra indicates a problem with the O2 Low Reference Circuit Low Voltage, specifically related to the NOx Sensor 1. This sensor plays a crucial role in monitoring the level of nitrogen oxide emissions in the vehicle's exhaust system. When the O2 low reference circuit voltage drops below a specified threshold, it triggers the P1193 code, signaling an issue with the sensor's ability to accurately measure the NOx levels.

OBDII Code P1193 2017 GMC Sierra - O2 Low Reference Circuit Low Voltage (NOx Sensor 1)
P1193 2017 GMC Sierra Code - O2 Low Reference Circuit Low Voltage (NOx Sensor 1)

Common Causes of P1193 2017 GMC Sierra

  1. Faulty NOx Sensor: The sensor itself may be malfunctioning, leading to inaccurate readings and triggering the P1193 code.
  2. Wiring or Connector Issues: Damaged or corroded wiring or connectors in the O2 low reference circuit can disrupt the sensor's operation.
  3. ECM Malfunction: Problems with the engine control module (ECM) can affect the sensor's ability to function properly.
  4. Exhaust System Leaks: Leaks in the exhaust system can impact the NOx sensor's readings and trigger the P1193 code.
  5. Fuel Quality: Poor quality fuel or contaminated fuel can also affect the sensor's performance and trigger the code.

Symptoms of P1193 2017 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the P1193 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning NOx sensor can lead to decreased fuel efficiency as the engine may not be running optimally.
  3. Rough Idle: The engine may experience rough idling or hesitation when the sensor is not functioning correctly.
  4. Increased Emissions: Higher levels of nitrogen oxide emissions may be detected, leading to environmental concerns and potential legal issues.

How to Fix P1193 2017 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the P1193 code and perform further testing to pinpoint the exact cause of the problem.
  2. Inspect Wiring and Connectors: Check the wiring and connectors in the O2 low reference circuit for any damage or corrosion, and repair or replace as needed.
  3. Test NOx Sensor: Test the NOx sensor to determine if it is functioning correctly or needs to be replaced.
  4. Check ECM: Verify the engine control module (ECM) for any malfunctions or errors that could be affecting the sensor's operation.
  5. Clear Codes and Test Drive: After repairing or replacing any faulty components, clear the trouble codes, and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1193 2017 GMC Sierra

The cost estimate for repairing the P1193 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue and the required repairs. On average, the cost of parts for replacing a faulty NOx sensor or repairing wiring and connectors can range from $200 to $500. Labor costs at auto repair shops typically range from $80 to $150 per hour, with the total repair cost likely falling between $300 and $800. It's important to note that prices can vary based on location, vehicle make and model, and the extent of the repairs needed. It's recommended to obtain quotes from local auto repair shops for a more accurate cost estimate.

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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 GMC Sierra Code

1. What does the OBDII code P1193 mean on a 2017 GMC Sierra?

The P1193 code indicates a low voltage issue in the O2 low reference circuit for NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.

2. What are the common symptoms of P1193 on a 2017 GMC Sierra?

Symptoms may include the check engine light turning on, reduced fuel efficiency, decreased engine performance, or the vehicle entering limp mode.

3. What causes the P1193 code on a 2017 GMC Sierra?

Common causes include a faulty NOx sensor, damaged or corroded wiring or connectors, or issues with the vehicle's powertrain control module (PCM).

4. Can I drive my 2017 GMC Sierra with the P1193 code?

Driving with this code is not recommended as it may lead to reduced performance, increased emissions, and potential damage to the exhaust system.

5. How do I diagnose the P1193 code on a 2017 GMC Sierra?

Start by inspecting the NOx sensor and its wiring for damage or corrosion. Use a multimeter to check voltage levels and scan the PCM for related codes.

6. How do I fix the P1193 code on a 2017 GMC Sierra?

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

7. How much does it cost to fix the P1193 code on a 2017 GMC Sierra?

Costs can vary, but replacing a NOx sensor typically ranges from $300 to $700, while wiring repairs or PCM replacement may cost more.

8. Can a bad NOx sensor cause the P1193 code?

Yes, a malfunctioning NOx sensor is a common cause of the P1193 code and should be tested as part of the diagnostic process.

9. Will clearing the P1193 code fix the problem on a 2017 GMC Sierra?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.

10. Is the P1193 code related to emissions on a 2017 GMC Sierra?

Yes, this code is related to the vehicle's emissions system, as the NOx sensor plays a key role in monitoring and reducing harmful exhaust emissions.

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