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Engine-Codes – GMC – P116A 2016 GMC Sierra

P116A 2016 GMC Sierra Code - O2 Signal Circuit (NOx Sensor 1)

Quick Answer

The P116A diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the O2 signal circuit for NOx Sensor 1. Common causes include Faulty NOx sensor, Wiring or connector issues in the O2 signal circuit, ECM malfunction. 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 2016 GMC Sierra indicates O2 Signal Circuit (NOx Sensor 1).
Common causes
Common causes include Faulty NOx sensor, Wiring or connector issues in the O2 signal circuit, ECM malfunction.
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 16, 2024
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Code P116A 2016 GMC Sierra Description

The P116A diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the O2 signal circuit for NOx Sensor 1. This code indicates that there is a malfunction in the oxygen sensor circuit associated with the first nitrogen oxide (NOx) sensor in the vehicle's exhaust system. The NOx sensor is responsible for monitoring the levels of nitrogen oxide emissions in the exhaust gases and providing feedback to the engine control module (ECM) to help optimize fuel efficiency and reduce harmful emissions.

OBDII Code P116A 2016 GMC Sierra - O2 Signal Circuit (NOx Sensor 1)
P116A 2016 GMC Sierra Code - O2 Signal Circuit (NOx Sensor 1)

Common Causes of P116A 2016 GMC Sierra

  1. Faulty NOx sensor
  2. Wiring or connector issues in the O2 signal circuit
  3. ECM malfunction
  4. Exhaust system leaks
  5. Contaminated exhaust gases affecting sensor readings

Symptoms of P116A 2016 GMC Sierra

  1. Decreased fuel efficiency
  2. Engine misfires or rough idling
  3. Check Engine Light illuminated
  4. Reduced engine power
  5. Failed emissions test

How to Fix P116A 2016 GMC Sierra

  1. Diagnose the issue by using a scan tool to read the DTC and inspecting the NOx sensor and associated wiring.
  2. Replace the faulty NOx sensor if it is determined to be the cause of the problem.
  3. Repair or replace any damaged wiring or connectors in the O2 signal circuit.
  4. Clear the DTC from the ECM memory and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any underlying ECM issues.

Cost to Fix P116A 2016 GMC Sierra

The typical repair costs for addressing a P116A code on a 2016 GMC Sierra can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources before proceeding with the repair.

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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 P116A 2016 GMC Sierra Code

1. What does the OBDII code P116A mean on a 2016 GMC Sierra?

P116A refers to an issue with the O2 signal circuit in NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust system.

2. What are the symptoms of code P116A on a 2016 GMC Sierra?

Symptoms may include a check engine light, decreased fuel efficiency, reduced engine performance, and possible emissions test failure.

3. What causes the P116A code to appear?

Common causes include a faulty NOx sensor, damaged wiring or connectors, excessive soot buildup, or an issue with the engine control module (ECM).

4. Can I drive my 2016 GMC Sierra with a P116A code?

While the vehicle may still be drivable, ignoring this code can lead to reduced fuel efficiency and potential damage to the emissions system over time.

5. How do I diagnose the P116A code?

Diagnosis involves scanning the ECM for additional codes, visually inspecting the NOx sensor wiring and connectors, and testing the sensor's output with a multimeter.

6. How do I fix the P116A code on my GMC Sierra?

Repairs may include replacing the NOx sensor, repairing damaged wiring or connectors, cleaning the exhaust system, or reprogramming the ECM if necessary.

7. How much does it cost to fix the P116A code?

Repair costs can range from $200 to $600 or more, depending on whether the NOx sensor needs replacement and labor costs in your area.

8. Can a dirty exhaust system cause the P116A code?

Yes, excessive soot or carbon buildup in the exhaust system can interfere with the NOx sensor's readings and trigger the P116A code.

9. How can I prevent the P116A code from occurring?

Regular maintenance, using high-quality fuel, and ensuring the exhaust system is clean can help prevent issues with the NOx sensor and related circuits.

10. Do I need to replace both NOx sensors if I get a P116A code?

Not necessarily. The P116A code specifically points to NOx Sensor 1. However, it's a good idea to inspect both sensors to ensure proper functionality.

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