Engine-Codes.com
Engine-Codes – GMC – P116A GMC

P116A GMC Code - O2 Signal Circuit (NOx Sensor 1)

Quick Answer

The P116A diagnostic trouble code (DTC) for GMC vehicles refers to an issue with the O2 signal circuit for NOx Sensor 1. Common causes include Faulty NOx sensor, Wiring issues or corrosion in the O2 signal circuit, Poor electrical connections. 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
P116A GMC indicates O2 Signal Circuit (NOx Sensor 1).
Common causes
Common causes include Faulty NOx sensor, Wiring issues or corrosion in the O2 signal circuit, Poor electrical connections.
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 07, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P116A GMC Description

The P116A diagnostic trouble code (DTC) for GMC vehicles refers to an issue with the O2 signal circuit for NOx Sensor 1. This code indicates that there is a problem with the signal being sent by the first NOx (nitrogen oxide) sensor in the vehicle's exhaust system. NOx sensors are responsible for monitoring the levels of nitrogen oxide in the exhaust gases to ensure compliance with emission regulations and to help optimize fuel efficiency. When this sensor fails to provide accurate readings or if there is a fault in the signal circuit, it can lead to a variety of performance issues.

OBDII Code P116A GMC - O2 Signal Circuit (NOx Sensor 1)
P116A GMC Code - O2 Signal Circuit (NOx Sensor 1)

Common Causes of P116A GMC

  1. Faulty NOx sensor.
  2. Wiring issues or corrosion in the O2 signal circuit.
  3. Poor electrical connections.
  4. Exhaust system leaks.
  5. Engine running too rich or too lean.

Symptoms of P116A GMC

  1. Check engine light illuminated on the dashboard.
  2. Decreased fuel efficiency.
  3. Rough idling or stalling.
  4. Reduced engine performance.
  5. Increased emissions.

How to Fix P116A GMC

  1. Begin by diagnosing the specific cause of the issue using a scan tool to read the DTC and pinpoint the problem area.
  2. Inspect the NOx sensor and its wiring for any signs of damage or corrosion. Replace the sensor if necessary.
  3. Check the O2 signal circuit for any loose connections or wiring issues. Repair or replace damaged components as needed.
  4. Clear the DTC from the vehicle's memory using the scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, seek the assistance of a professional mechanic for further diagnosis and repair.

Cost to Fix P116A GMC

The cost of repairing a P116A DTC for GMC vehicles can vary depending on the specific cause of the issue and the necessary repairs. In general, the cost of replacing a NOx sensor can range from $150 to $400, while addressing wiring issues or electrical problems may cost between $100 and $300. Labor costs can add an additional $80 to $150 per hour, with the total repair cost typically ranging from $250 to $800. It is important to consult with a trusted mechanic or auto repair shop to obtain an accurate estimate based on the specific circumstances of your vehicle.

Need more information about the P116A GMC code?

Need more information on how to fix the P116A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P116A GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

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 P116A GMC Code

1. What are common symptoms of OBDII code P116A GMC (O2 Signal Circuit - NOx Sensor 1)?

- Common symptoms include decreased fuel efficiency, rough idling, engine misfires, and the illumination of the Check Engine Light.

2. What causes OBDII code P116A GMC to trigger?

- This code is typically triggered by issues with the NOx sensor 1 signal circuit, such as sensor wiring problems, sensor failure, or issues with the sensor's connection.

3. How can I diagnose the O2 signal circuit issue related to code P116A GMC?

- Diagnosing this issue involves checking the wiring harness for any damage or corrosion, testing the NOx sensor 1 for proper function, and ensuring there are no loose connections.

4. Can a faulty NOx sensor 1 cause code P116A GMC to appear?

- Yes, a faulty NOx sensor 1 can cause code P116A to appear, as it directly impacts the signal circuit related to the oxygen sensor.

5. Are there any DIY repair tips for fixing OBDII code P116A GMC?

- DIY repair tips include checking and repairing any damaged wiring, replacing the NOx sensor 1 if faulty, and clearing the code with an OBDII scanner after making repairs.

6. How critical is it to address OBDII code P116A GMC promptly?

- It is important to address this code promptly to prevent potential issues with the vehicle's emissions system and to ensure optimal engine performance.

7. What role does the NOx sensor 1 play in the vehicle's emissions system?

- The NOx sensor 1 is responsible for monitoring and measuring the level of nitrogen oxide emissions in the exhaust system to help the vehicle meet emissions standards.

8. Can driving with OBDII code P116A GMC cause further damage to the vehicle?

- Continuing to drive with this code may lead to decreased fuel efficiency, potential damage to the catalytic converter, and increased emissions output.

9. Is it safe to reset the Check Engine Light after addressing code P116A GMC?

- Yes, it is safe to reset the Check Engine Light using an OBDII scanner after addressing and repairing the underlying issue causing code P116A.

10. How can a professional mechanic help with diagnosing and repairing OBDII code P116A GMC?

- A professional mechanic can use specialized diagnostic tools to pinpoint the exact cause of the issue, perform thorough inspections, and expertly repair the NOx sensor 1 signal circuit for optimal performance.

Discuss the causes and fixes for P116A GMC OBDII Code

Submit a New Comment

Code P116A GMC comments

No comments found for this page.