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Engine-Codes – GMC – P116B GMC

P116B GMC Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)

Quick Answer

The P116B GMC code indicates a problem with the O2 signal circuit low voltage specifically related to the NOx sensor 1. Common causes include Faulty NOx sensor, Damaged wiring or connectors, Corrosion in the sensor circuit. 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
P116B GMC indicates O2 Signal Circuit Low Voltage (NOx Sensor 1).
Common causes
Common causes include Faulty NOx sensor, Damaged wiring or connectors, Corrosion in the sensor circuit.
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 10, 2024
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Code P116B GMC Description

The P116B GMC code indicates a problem with the O2 signal circuit low voltage specifically related to the NOx sensor 1. The NOx sensor is responsible for monitoring the levels of nitrogen oxide in the exhaust gases of the vehicle. When the O2 signal circuit voltage is low, it means that the sensor is not sending the proper signals to the engine control module (ECM), which can impact the engine's performance and emissions.

OBDII Code P116B GMC - O2 Signal Circuit Low Voltage (NOx Sensor 1)
P116B GMC Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)

Common Causes of P116B GMC

  1. Faulty NOx sensor
  2. Damaged wiring or connectors
  3. Corrosion in the sensor circuit
  4. Issues with the ECM
  5. Exhaust leaks

Symptoms of P116B GMC

  1. Decreased fuel efficiency
  2. Rough idling
  3. Poor acceleration
  4. Failure to pass emissions tests
  5. Check engine light illuminated

How to Fix P116B GMC

  1. Begin by diagnosing the specific cause of the low voltage in the O2 signal circuit related to the NOx sensor 1.
  2. Inspect the NOx sensor and its wiring for any visible damage or corrosion. Replace any damaged components.
  3. Check the connectors for proper connection and corrosion. Clean or replace connectors as needed.
  4. Test the ECM to ensure it is functioning correctly and communicate with the sensor properly.
  5. Clear the diagnostic trouble codes and test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P116B GMC

The cost of repairing a P116B GMC code can vary depending on the specific cause of the issue. On average, the cost of parts for replacing a NOx sensor can range from $200 to $500, while the cost of labor may be around $100 to $200 per hour. Overall, the total repair cost for this issue could range from $300 to $800, excluding any additional diagnostic fees. It is recommended to consult with a certified mechanic to get an accurate estimate based on your vehicle's make and model.

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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 P116B GMC Code

1. What are the common symptoms of OBDII code P116B GMC related to the O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and possible stalling.

2. What are the typical causes of OBDII code P116B GMC indicating O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- The code can be triggered by issues such as a faulty NOx sensor, damaged wiring or connectors, a failing PCM, or a malfunctioning O2 sensor.

3. How can I diagnose the O2 Signal Circuit Low Voltage issue associated with OBDII code P116B GMC?

- Diagnosis typically involves checking the NOx sensor for proper operation, inspecting wiring for damage or corrosion, and assessing the connections and the PCM for any faults.

4. Can a dirty or contaminated NOx sensor cause O2 Signal Circuit Low Voltage and trigger code P116B GMC?

- Yes, a dirty or contaminated NOx sensor can lead to inaccurate readings, causing the O2 Signal Circuit Low Voltage issue and triggering code P116B.

5. What are some repair tips for resolving O2 Signal Circuit Low Voltage with code P116B GMC?

- Repair options may include cleaning or replacing the NOx sensor, repairing damaged wiring, cleaning connectors, or resetting the PCM to clear the code.

6. Is it safe to continue driving with OBDII code P116B GMC related to O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- It is not recommended to drive with this code active, as it can lead to further engine problems and potential emissions issues.

7. Can a DIY enthusiast fix O2 Signal Circuit Low Voltage issue causing OBDII code P116B GMC?

- Depending on your skill level and access to tools, some repairs related to this code, such as sensor cleaning or basic wiring checks, may be possible for a DIY enthusiast.

8. How important is it to address O2 Signal Circuit Low Voltage with code P116B GMC promptly?

- It is crucial to address this issue promptly to ensure optimal engine performance, fuel efficiency, and compliance with emission regulations.

9. Are there any recalls or service bulletins related to OBDII code P116B GMC and the O2 Signal Circuit Low Voltage issue?

- It is advisable to check with the manufacturer or a certified dealership for any relevant recalls or service bulletins that may pertain to this specific problem.

10. What is the typical cost of repairing O2 Signal Circuit Low Voltage causing OBDII code P116B GMC?

- The cost of repair can vary depending on the specific issue, but it may involve expenses for parts, labor, and diagnostic services, ranging from a few hundred to over a thousand dollars.

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