Engine-Codes.com
Engine-Codes – GMC – P116A 2015 GMC Sierra

P116A 2015 GMC Sierra Code - O2 Signal Circuit (NOx Sensor 1)

Quick Answer

The P116A code indicates a malfunction in the O2 signal circuit associated with the NOx (Nitrogen Oxide) sensor 1 in a 2015 GMC Sierra. Common causes include Faulty NOx Sensor: The sensor itself may be defective, providing incorrect readings to the ECM, Wiring Issues: Damaged or corroded wiring in the O2 signal circuit can disrupt communication between the sensor and the ECM, Poor Connections: Loose or corroded connectors can lead to intermittent signals, triggering the code. 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 2015 GMC Sierra indicates O2 Signal Circuit (NOx Sensor 1).
Common causes
Common causes include Faulty NOx Sensor: The sensor itself may be defective, providing incorrect readings to the ECM, Wiring Issues: Damaged or corroded wiring in the O2 signal circuit can disrupt communication between the sensor and the ECM, Poor Connections: Loose or corroded connectors can lead to intermittent signals, triggering the code.
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 Oct 21, 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 2015 GMC Sierra Description

The P116A code indicates a malfunction in the O2 signal circuit associated with the NOx (Nitrogen Oxide) sensor 1 in a 2015 GMC Sierra. This code is part of the vehicle's onboard diagnostics (OBD-II) system, which monitors various components to ensure optimal performance and compliance with emissions regulations. The NOx sensor plays a crucial role in measuring the concentration of nitrogen oxides in the exhaust gases, which is essential for the vehicle's emissions control system.

OBDII Code P116A 2015 GMC Sierra - O2 Signal Circuit (NOx Sensor 1)
P116A 2015 GMC Sierra Code - O2 Signal Circuit (NOx Sensor 1)

Common Causes of P116A 2015 GMC Sierra

  1. Faulty NOx Sensor: The sensor itself may be defective, providing incorrect readings to the ECM.
  2. Wiring Issues: Damaged or corroded wiring in the O2 signal circuit can disrupt communication between the sensor and the ECM.
  3. Poor Connections: Loose or corroded connectors can lead to intermittent signals, triggering the code.
  4. Exhaust Leaks: Leaks in the exhaust system can affect the accuracy of the NOx sensor readings.
  5. ECM Malfunction: In rare cases, a malfunctioning ECM may misinterpret the signals from the NOx sensor.

Symptoms of P116A 2015 GMC Sierra

  1. Check Engine Light: The most common symptom is the illumination of the check engine light on the dashboard.
  2. Poor Fuel Economy: Drivers may notice a decrease in fuel efficiency due to improper air-fuel mixture adjustments.
  3. Rough Idle: The engine may exhibit a rough idle or stalling, particularly during low-speed driving or at stops.
  4. Increased Emissions: The vehicle may produce higher levels of nitrogen oxides, potentially leading to emissions test failures.
  5. Loss of Power: There may be a noticeable reduction in engine power and acceleration, especially under load.

How to Fix P116A 2015 GMC Sierra

  1. Diagnostic Scan: Start by using an OBD-II scanner to confirm the P116A code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Conduct a thorough visual inspection of the NOx sensor and its wiring harness for any signs of damage, corrosion, or loose connections.
  3. Sensor Replacement: If the NOx sensor is determined to be faulty, replace it with a new, OEM-quality sensor to ensure proper function.
  4. Repair Wiring: If wiring issues are identified, repair or replace damaged wires and ensure all connections are secure and free of corrosion.
  5. Clear Codes and Test Drive: After repairs, clear the codes from the ECM and perform a test drive to verify that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix P116A 2015 GMC Sierra

The cost to repair the P116A code can vary widely based on the specific issue and local labor rates. On average, replacing a NOx sensor can range from $200 to $600, including parts and labor. The sensor itself typically costs between $100 and $300, while labor can range from $100 to $300 depending on the shop's hourly rate. It's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops commonly charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It's advisable to check local rates for a more precise estimate.

Need more information about the P116A 2015 GMC Sierra code?

Need more information on how to fix the P116A 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P116A 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2015 GMC Sierra Code

What does OBDII code P116A mean for a 2015 GMC Sierra?

OBDII code P116A indicates a problem with the O2 signal circuit related to the NOx sensor 1, suggesting that the sensor is not providing the expected readings.

What symptoms might occur if my GMC Sierra has the P116A code?

Common symptoms include poor engine performance, increased fuel consumption, rough idling, and the check engine light being illuminated.

What are the potential causes of the P116A code?

Potential causes include a faulty NOx sensor, wiring issues such as shorts or open circuits in the O2 signal circuit, or a malfunctioning engine control module (ECM).

Can driving with the P116A code cause damage to my vehicle?

While it may not cause immediate damage, ignoring the code can lead to poor engine performance and increased emissions, which could result in more serious issues over time.

How can I diagnose the P116A code?

Start by using an OBDII scanner to confirm the code and check for any related codes. Inspect the wiring and connectors to the NOx sensor for damage, and test the sensor itself for proper function.

What repairs are typically needed to fix the P116A code?

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

Is it advisable to clear the P116A code without making repairs?

Clearing the code without addressing the underlying issue is not recommended, as the problem will likely recur and could lead to further complications.

How much does it typically cost to repair the P116A code?

Repair costs can vary widely depending on the cause; replacing a NOx sensor can range from $100 to $300, while wiring repairs may cost more depending on the complexity.

Can I fix the P116A code myself?

If you have experience with automotive repairs, you may be able to diagnose and replace the NOx sensor or repair wiring issues. However, if you're unsure, it's best to consult a professional mechanic.

Discuss the causes and fixes for P116A 2015 GMC Sierra OBDII Code

Submit a New Comment

Code P116A 2015 GMC Sierra comments

No comments found for this page.